Sudan function

Sudan function
You are encouraged to solve this task according to the task description, using any language you may know.

The Sudan function is a classic example of a recursive function, notable especially because it is not a primitive recursive function. This is also true of the better-known Ackermann function. The Sudan function was the first function having this property to be published.

The Sudan function is usually defined as follows (svg):

${\displaystyle {\begin{array}{lll}F_{0}(x,y)&=x+y\\F_{n+1}(x,0)&=x&{\text{if }}n\geq 0\\F_{n+1}(x,y+1)&=F_{n}(F_{n+1}(x,y),F_{n+1}(x,y)+y+1)&{\text{if }}n\geq 0\\\end{array}}}$

Task

Write a function which returns the value of F(x, y).

8080 Assembly

        org     100h
        jmp     demo
        ;; Sudan function. BC=N, DE=X, HL=Y; output in HL.
sudan:  mov     a,b             ; N=0?
        ora     c
        jz      sdnbse
        mov     a,h             ; Y=0?
        ora     l
        jz      sdnbse
        push    b               ; Save N and Y (we don't need X)
        push    h
        dcx     h
        call    sudan           ; Calculate result of inner call
        xchg                    ; Set X = result of inner call
        pop     h               ; Get Y
        dad     d               ; Set Y = Y + result of inner call
        pop     b               ; Get N
        dcx     b               ; N = N-1
        jmp     sudan           ; Calculate result of outer call
sdnbse: dad     d               ; Return X+Y (base case) 
        ret

        ;; Output routine (show 'sudan(N,X,Y) = value'), using CP/M call
show:   push    h!      push    d!      push    b!      ; Copies of args
        push    h!      push    d!      push    b!      ; For output              
        lxi     d,sdt!  call    pstr                    ; Print call
        pop     h!      call    prhl
        lxi     d,sdc!  call    pstr
        pop     h!      call    prhl
        lxi     d,sdc!  call    pstr
        pop     h!      call    prhl 
        lxi     d,sdi!  call    pstr
        pop     b!      pop     d!      pop     h!      ; Restore args
        call    sudan!  call    prhl                    ; Find and print result
        lxi     d,sdnl! jmp     pstr
prhl:   lxi     d,numbuf!       push    d!      lxi     b,-10
prdgt:  lxi     d,-1
pdiv:   inx     d!              dad     b!      jc      pdiv
        mvi     a,'0'+10!       add     l!      pop     h
        dcx     h!              mov     m,a!    push    h
        xchg!   mov     a,h!    ora     l!      jnz     prdgt
        pop     d
pstr:   mvi     c,9!    jmp     5

        ;; Set up big system stack (using CP/M)
demo:   lhld    6
        sphl
        ;; Show a couple of values
        lxi     b,0!    lxi     d,0!    lxi     h,0!    call    show
        lxi     b,1!    lxi     d,1!    lxi     h,1!    call    show
        lxi     b,2!    lxi     d,1!    lxi     h,1!    call    show
        lxi     b,3!    lxi     d,1!    lxi     h,1!    call    show
        lxi     b,2!    lxi     d,2!    lxi     h,1!    call    show
        rst     0
sdt:    db      'sudan($'
sdc:    db      ', $'
sdi:    db      ') = $'
        db      '.....'
numbuf: db      '$'
sdnl:   db      13,10,'$'

Output:

sudan(0, 0, 0) = 0
sudan(1, 1, 1) = 3
sudan(2, 1, 1) = 8
sudan(3, 1, 1) = 10228
sudan(2, 2, 1) = 27

Ada

Translation of: JavaScript

with Ada.Text_IO; use Ada.Text_IO;

procedure Sudan_Function is

   function F (N, X, Y : Natural) return Natural
   is (if    N = 0 then X + Y
       elsif Y = 0 then X
       else  F (N => N - 1,
                X => F (N, X, Y - 1),
                Y => F (N, X, Y - 1) + Y));

begin
   Put_Line ("F0 (0, 0) = " & F (0, 0, 0)'Image);
   Put_Line ("F1 (1, 1) = " & F (1, 1, 1)'Image);
   Put_Line ("F1 (3, 3) = " & F (1, 3, 3)'Image);
   Put_Line ("F2 (1, 1) = " & F (2, 1, 1)'Image);
   Put_Line ("F2 (2, 1) = " & F (2, 2, 1)'Image);
   Put_Line ("F3 (1, 1) = " & F (3, 1, 1)'Image);
end Sudan_Function;

Output:

F0 (0, 0) =  0
F1 (1, 1) =  3
F1 (3, 3) =  35
F2 (1, 1) =  8
F2 (2, 1) =  27
F3 (1, 1) =  10228

ALGOL 68

Translation of: Wren

...with a minor optimisation.

BEGIN # compute some values of the Sudan function                          #
    PROC sudan = ( INT n, x, y )INT:
         IF   n = 0 THEN x + y
         ELIF y = 0 THEN x
         ELSE
             INT s = sudan( n, x, y - 1 );
             sudan( n - 1, s, s + y )
         FI # sudan # ;
    FOR n FROM 0 TO 1 DO
        print( ( "Values of F(", whole( n, 0 ), ", x, y):", newline ) );
        print( ( "y/x    0   1   2   3   4   5",            newline ) );
        print( ( "----------------------------",            newline ) );
        FOR y FROM 0 TO 6 DO
            print( ( whole( y, 0 ), "  |" ) );
            FOR x FROM 0 TO 5 DO
                print( ( whole( sudan( n, x, y ), -4 ) ) )
            OD;
            print( ( newline ) )
        OD;
        print( ( newline ) )
    OD;
    print( ( newline ) );
    print( ( "F(2, 1, 1) = ", whole( sudan( 2, 1, 1 ), 0 ), newline ) );
    print( ( "F(3, 1, 1) = ", whole( sudan( 3, 1, 1 ), 0 ), newline ) );
    print( ( "F(2, 2, 1) = ", whole( sudan( 2, 2, 1 ), 0 ), newline ) )
END

Output:

Values of F(0, x, y):
y/x    0   1   2   3   4   5
----------------------------
0  |   0   1   2   3   4   5
1  |   1   2   3   4   5   6
2  |   2   3   4   5   6   7
3  |   3   4   5   6   7   8
4  |   4   5   6   7   8   9
5  |   5   6   7   8   9  10
6  |   6   7   8   9  10  11

Values of F(1, x, y):
y/x    0   1   2   3   4   5
----------------------------
0  |   0   1   2   3   4   5
1  |   1   3   5   7   9  11
2  |   4   8  12  16  20  24
3  |  11  19  27  35  43  51
4  |  26  42  58  74  90 106
5  |  57  89 121 153 185 217
6  | 120 184 248 312 376 440


F(2, 1, 1) = 8
F(3, 1, 1) = 10228
F(2, 2, 1) = 27

APL

 sudan←{
    0∨.>⍺ ⍺⍺ ⍵:'Negative input'⎕SIGNAL 11
    ⍺⍺=0:⍺+⍵
    ⍵=0:⍺
    tm((⍺⍺-1)∇∇)⍵+tm←⍺∇⍵-1
 }

Output:

      0 sudan/¨ ¯1+⍳ 6 7
0 1 2 3 4  5  6
1 2 3 4 5  6  7
2 3 4 5 6  7  8
3 4 5 6 7  8  9
4 5 6 7 8  9 10
5 6 7 8 9 10 11
      1 sudan/¨ ¯1+⍳ 6 7
0  1  4 11  26  57 120
1  3  8 19  42  89 184
2  5 12 27  58 121 248
3  7 16 35  74 153 312
4  9 20 43  90 185 376
5 11 24 51 106 217 440
      1 (2 sudan) 1
8
      1 (3 sudan) 1
10228
      2 (2 sudan) 1
27

Arturo

sudan: function [n, x, y][
    if n = 0 -> return x + y
    if y = 0 -> return x

    sudan n-1 sudan n x y-1 y + sudan n x y-1
]

print sudan 1 3 3

Output:

35

Asymptote

int F(int n, int x, int y) {
  if (n == 0) return x + y;
  if (y == 0) return x;
  return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
}

for (int n = 0; n <= 1; ++n) {
  write("Values of F(", n, suffix=none);
  write(", x, y ):");
  write("-----------------------------");
  for (int y = 0; y <= 6; ++y) {
    write(y, suffix=none);
    write("  |", suffix=none);
    for (int x = 0; x <= 5; ++x) {
      write("  ", F(n, x, y), suffix=none);
    }
    write();
  }
  write();
}
write("F(0,0,0) = ", F(0, 0, 0));
write("F(1,3,3) = ", F(1, 3, 3));
write("F(2,1,1) = ", F(2, 1, 1));
write("F(3,1,1) = ", F(3, 1, 1));
write("F(2,2,1) = ", F(2, 2, 1));

AWK

# syntax: GAWK -f SUDAN_FUNCTION.AWK
BEGIN {
    for (n=0; n<=1; n++) {
      printf("sudan(%d,x,y)\n",n)
      printf("y/x    0   1   2   3   4   5\n")
      printf("%s\n",strdup("-",28))
      for (y=0; y<=6; y++) {
        printf("%2d | ",y)
        for (x=0; x<=5; x++) {
          printf("%3d ",sudan(n,x,y))
        }
        printf("\n")
      }
      printf("\n")
    }
    n=1; x=3; y=3; printf("sudan(%d,%d,%d)=%d\n",n,x,y,sudan(n,x,y))
    n=2; x=1; y=1; printf("sudan(%d,%d,%d)=%d\n",n,x,y,sudan(n,x,y))
    n=2; x=2; y=1; printf("sudan(%d,%d,%d)=%d\n",n,x,y,sudan(n,x,y))
    n=3; x=1; y=1; printf("sudan(%d,%d,%d)=%d\n",n,x,y,sudan(n,x,y))
    exit(0)
}
function sudan(n,x,y) {
    if (n == 0) { return(x+y) }
    if (y == 0) { return(x) }
    return sudan(n-1, sudan(n,x,y-1), sudan(n,x,y-1)+y)
}
function strdup(str,n,  i,new_str) {
    for (i=1; i<=n; i++) {
      new_str = new_str str
    }
    return(new_str)
}

Output:

sudan(0,x,y)
y/x    0   1   2   3   4   5
----------------------------
 0 |   0   1   2   3   4   5
 1 |   1   2   3   4   5   6
 2 |   2   3   4   5   6   7
 3 |   3   4   5   6   7   8
 4 |   4   5   6   7   8   9
 5 |   5   6   7   8   9  10
 6 |   6   7   8   9  10  11

sudan(1,x,y)
y/x    0   1   2   3   4   5
----------------------------
 0 |   0   1   2   3   4   5
 1 |   1   3   5   7   9  11
 2 |   4   8  12  16  20  24
 3 |  11  19  27  35  43  51
 4 |  26  42  58  74  90 106
 5 |  57  89 121 153 185 217
 6 | 120 184 248 312 376 440

sudan(1,3,3)=35
sudan(2,1,1)=8
sudan(2,2,1)=27
sudan(3,1,1)=10228

BASIC

BASIC256

Translation of: FreeBASIC

for n = 0 to 1
    print "Values of F(" & n & ", x, y):"
    print "y/x    0   1   2   3   4   5"
    print ("-"*28)
    for y = 0 to 6
        print y; "  |";
        for x = 0 to 5
            print rjust(string(F(n,x,y)),4);
        next x
        print
    next y
    print
next n

print "F(2,1,1) = "; F(2,1,1)
print "F(3,1,1) = "; F(3,1,1)
print "F(2,2,1) = "; F(2,2,1)
end

function F(n, x, y)
    if n = 0 then return x + y
    if y = 0 then return x
    return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
end function

Output:

Same as FreeBASIC entry.

Chipmunk Basic

Translation of: FreeBASIC

Works with: Chipmunk Basic version 3.6.4

100 sub f(n,x,y)
110   if n = 0 then f = x+y : exit sub
120   if y = 0 then f = x : exit sub
130   f = f(n-1,f(n,x,y-1),f(n,x,y-1)+y)
140 end sub
150 for n = 0 to 1
160   print using " Values of F(#, x, y ):";n
170   print " y/x   0   1   2   3   4   5"
180   print " -----------------------------"
190   for y = 0 to 6
200     print y;"  |";
210     for x = 0 to 5
220       print using "####";f(n,x,y);
230     next x
240     print
250   next y
260   print
270 next n
280 print "F(0,0,0) = ";f(0,0,0)
290 print "F(1,3,3) = ";f(1,3,3)
300 print "F(2,1,1) = ";f(2,1,1)
310 print "F(3,1,1) = ";f(3,1,1)
320 print "F(2,2,1) = ";f(2,2,1)

Output:

Same as FreeBASIC entry.

Gambas

Translation of: FreeBASIC

Function F(n As Integer, x As Integer, y As Integer) As Integer 
  
  If n = 0 Then Return x + y 
  If y = 0 Then Return x 
  Return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y) 
  
End Function

Public Sub Main() 
  
  Dim n, x, y As Integer

  For n = 0 To 1 
    Print " Values of F(" & n & ", x, y):" 
    Print " y/x    0   1   2   3   4   5" 
    Print String(29, "-") 'Print " ----------------------------"
    For y = 0 To 6 
      Print y; "  | "; 
      For x = 0 To 5 
        Print Format$(F(n, x, y), "####"); 
      Next 
      Print 
    Next 
    Print 
  Next 
  
  Print "F(2,1,1) = "; F(2, 1, 1) 
  Print "F(3,1,1) = "; F(3, 1, 1) 
  Print "F(2,2,1) = "; F(2, 2, 1)
  
End

Output:

Same as FreeBASIC entry.

OxygenBasic

Translation of: FreeBASIC

uses console 
'
function F(int n, x, y) as int
  if n = 0 then
    function = x + y
    exit function
  endif
  if y = 0 then
    function = x
    exit function
  endif
  function = F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
end function
'
int n, x, y
for n = 0 to 1
  printl " Values of F(" n ", x, y ):"
  printl " y/x    0       1       2       3       4       5"
  printl string(52, "-")
  for y = 0 to 6
    print "  " y " |" tab
    for x = 0 to 5
      print F(n, x, y) tab
    next x
    printl
  next y
  printl
next n
'
printl "F(0,0,0) = " F(0, 0, 0)
printl "F(1,3,3) = " F(1, 3, 3)
printl "F(2,1,1) = " F(2, 1, 1)
printl "F(3,1,1) = " F(3, 1, 1)
printl "F(2,2,1) = " F(2, 2, 1)

printl cr "Enter ..."
waitkey

Output:

Similar to FreeBASIC entry.

PureBasic

Procedure.d F(n.i, x.i, y.i)
  If n = 0
    ProcedureReturn x + y
  ElseIf y = 0
    ProcedureReturn x
  Else 
    ProcedureReturn F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
  EndIf
EndProcedure

OpenConsole()
For n = 0 To 1
  PrintN("Values of F(" + Str(n) + ", x, y):")
  PrintN("y/x     0       1       2       3       4       5")
  PrintN("---------------------------------------------------")
  For y = 0 To 6
    Print(Str(y) + " |")
    For x = 0 To 5
      Print(#TAB$ + F(n,x,y))
    Next x
    PrintN("")
  Next y
  PrintN("")
Next n

PrintN("F(2,1,1) = " + Str(F(2,1,1)))
PrintN("F(3,1,1) = " + Str(F(3,1,1)))
PrintN("F(2,2,1) = " + Str(F(2,2,1)))
Input()
CloseConsole()

Output:

Similat to FreeBASIC entry.

QBasic

Works with: QBasic version 1.1

Works with: QuickBasic version 4.5

Works with: Just BASIC

Works with: Liberty BASIC

Works with: Run BASIC

Works with: True BASIC

FUNCTION F(n,x,y)
    IF n = 0 THEN
       LET F = x + y
    ELSE
       IF y = 0 THEN
          LET F = x
       ELSE
          LET F = F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
       END IF
    END IF
END FUNCTION

PRINT "F(2,1,1) = "; F(2, 1, 1)
PRINT "F(3,1,1) = "; F(3, 1, 1)
PRINT "F(2,2,1) = "; F(2, 2, 1)
END

Run BASIC

Works with: Just BASIC

Works with: Liberty BASIC

Works with: QBasic

Works with: True BASIC

FUNCTION F(n,x,y)
    IF n = 0 THEN
       LET F = x + y
    ELSE
       IF y = 0 THEN
          LET F = x
       ELSE
          LET F = F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
       END IF
    END IF
END FUNCTION

PRINT "F(2,1,1) = "; F(2, 1, 1)
PRINT "F(3,1,1) = "; F(3, 1, 1)
PRINT "F(2,2,1) = "; F(2, 2, 1)
END

True BASIC

Works with: Just BASIC

Works with: Liberty BASIC

Works with: QBasic

Works with: Run BASIC

FUNCTION F(n,x,y)
    IF n = 0 THEN
       LET F = x + y
    ELSE
       IF y = 0 THEN
          LET F = x
       ELSE
          LET F = F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
       END IF
    END IF
END FUNCTION

PRINT "F(2,1,1) = "; F(2, 1, 1)
PRINT "F(3,1,1) = "; F(3, 1, 1)
PRINT "F(2,2,1) = "; F(2, 2, 1)
END

XBasic

Works with: Windows XBasic

PROGRAM	"Sudan function"
VERSION	"0.0000"

DECLARE FUNCTION Entry ()
DECLARE FUNCTION F (n, x, y)

FUNCTION Entry ()
FOR n = 0 TO 1
    PRINT " Values of F("; n; ", x, y ):"
    PRINT " y/x    0   1   2   3   4   5"
    PRINT " ----------------------------"
    FOR y = 0 TO 6
        PRINT y; "  |";
        FOR x = 0 TO 5
            PRINT FORMAT$("####", F(n, x, y));
        NEXT x
        PRINT
    NEXT y
    PRINT
NEXT n

PRINT "F(2,1,1) ="; F(2, 1, 1)
PRINT "F(3,1,1) ="; F(3, 1, 1)
PRINT "F(2,2,1) ="; F(2, 2, 1)

END FUNCTION

FUNCTION F (n, x, y)
    IF n = 0 THEN
        RETURN x + y
    ELSE
        IF y = 0 THEN
            RETURN x
        ELSE
            RETURN F (n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
        ENDIF
    ENDIF

END FUNCTION
END PROGRAM

Output:

Same as FreeBASIC entry.

Yabasic

Translation of: FreeBASIC

for n = 0 to 1
    print "Values of F(", n, ", x, y):"
    print "y/x    0   1   2   3   4   5"
    print "----------------------------"
    for y = 0 to 6
        print y, "  | ";
        for x = 0 to 5
            print F(n,x,y) using ("###");
        next x
        print
    next y
    print
next n

print "F(2,1,1) = ", F(2,1,1)
print "F(3,1,1) = ", F(3,1,1)
print "F(2,2,1) = ", F(2,2,1)
end

sub F(n, x, y)
    if n = 0  return x + y
    if y = 0  return x
    return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
end sub

Output:

Same as FreeBASIC entry.

BCPL

get "libhdr"

let sudan(n, x, y) =
    n = 0 -> x + y,
    y = 0 -> x,
    sudan(n-1, sudan(n, x, y-1), sudan(n, x, y-1)+y)

let showtable(f, n, x, y) be
$(  writef("sudan(%N,x,y)*N", n)
    writes("     ")
    for i=0 to x do writed(i, 5)
    for i=0 to y
    $(  writef("*N%I4:", i)
        for j=0 to x do writed(f(n, j, i), 5)
    $)
    writes("*N*N")
$)

let show(f, n, x, y) be
    writef("sudan(%I4,%I4,%I4) = %I6*N", n, x, y, f(n, x, y))

let start() be
$(  showtable(sudan, 0, 6, 5)
    showtable(sudan, 1, 6, 5) 
    wrch('*N')
    show(sudan, 1, 3, 3)
    show(sudan, 2, 1, 1)
    show(sudan, 2, 2, 1)
    show(sudan, 3, 1, 1)
$)

Output:

sudan(0,x,y)
         0    1    2    3    4    5    6
   0:    0    1    2    3    4    5    6
   1:    1    2    3    4    5    6    7
   2:    2    3    4    5    6    7    8
   3:    3    4    5    6    7    8    9
   4:    4    5    6    7    8    9   10
   5:    5    6    7    8    9   10   11

sudan(1,x,y)
         0    1    2    3    4    5    6
   0:    0    1    2    3    4    5    6
   1:    1    3    5    7    9   11   13
   2:    4    8   12   16   20   24   28
   3:   11   19   27   35   43   51   59
   4:   26   42   58   74   90  106  122
   5:   57   89  121  153  185  217  249


sudan(   1,   3,   3) =     35
sudan(   2,   1,   1) =      8
sudan(   2,   2,   1) =     27
sudan(   3,   1,   1) =  10228

BQN

_sudan←{
   x 0 _𝕣 y: x + y;
   x n _𝕣 0: x;
   x n _𝕣 y: k (n-1)_𝕣 y+k←x𝕊y-1 
}

•Show "⍉(↕7) 0 _sudan⌜ ↕6:"
•Show ⍉(↕7) 0 _sudan⌜ ↕6 

•Show "⍉(↕7) 1 _sudan⌜ ↕6:"
•Show ⍉(↕7) 1 _sudan⌜ ↕6 

•Show "1 2 _sudan 1: "∾•Fmt 1 2 _sudan 1
•Show "2 2 _sudan 1: "∾•Fmt 2 2 _sudan 1
•Show "1 3 _sudan 1: "∾•Fmt 1 3 _sudan 1

Output:

"⍉(↕7) 0 _sudan⌜ ↕6:"
┌─                 
╵ 0 1 2 3 4  5  6  
  1 2 3 4 5  6  7  
  2 3 4 5 6  7  8  
  3 4 5 6 7  8  9  
  4 5 6 7 8  9 10  
  5 6 7 8 9 10 11  
                  ┘
"⍉(↕7) 1 _sudan⌜ ↕6:"
┌─                           
╵  0  1   2   3   4   5   6  
   1  3   5   7   9  11  13  
   4  8  12  16  20  24  28  
  11 19  27  35  43  51  59  
  26 42  58  74  90 106 122  
  57 89 121 153 185 217 249  
                            ┘
"1 2 _sudan 1: 8"
"2 2 _sudan 1: 27"
"1 3 _sudan 1: 10228"

C

Translation of: JavaScript

//Aamrun, 11th July 2022

#include <stdio.h>

int F(int n,int x,int y) {
  if (n == 0) {
    return x + y;
  }
 
  else if (y == 0) {
    return x;
  }
 
  return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
}

int main() {
  printf("F1(3,3) = %d",F(1,3,3));
  return 0;
}

Output

F1(3,3) = 35

C++

Translation of: C

//Aamrun , 11th July, 2022

#include <iostream>
using namespace std;

int F(int n,int x,int y) {
  if (n == 0) {
    return x + y;
  }
 
  else if (y == 0) {
    return x;
  }
 
  return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
}

int main() {
  cout << "F(1,3,3) = "<<F(1,3,3)<<endl;
  return 0;
}

Output

F(1,3,3) = 35

C#

Translation of: C

//Aamrun, 11th July 2022

using System;

namespace Sudan
{
  class Sudan
  {
  	static int F(int n,int x,int y) {
  		if (n == 0) {
    		return x + y;
  		}
 
  		else if (y == 0) {
    		return x;
  		}
 
  		return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
	}
    
    static void Main(string[] args)
    {
      Console.WriteLine("F(1,3,3) = " + F(1,3,3));    
    }
  }
}

Output

F(1,3,3) = 35

CLU

sudan = proc (n, x, y: int) returns (int)
    if n=0 then 
        return(x + y)
    elseif y=0 then
        return(x)
    else
        k: int := sudan(n, x, y-1)
        return(sudan(n-1, k, k+y))
    end
end sudan

table = proc (n, xs, ys: int) returns (string)
    ss: stream := stream$create_output()
    stream$putl(ss, "sudan(" || int$unparse(n) || ",x,y):")
    stream$puts(ss, "     ")
    for x: int in int$from_to(0, xs) 
        do stream$putright(ss, int$unparse(x), 5) end
    for y: int in int$from_to(0, ys) do
        stream$putl(ss, "")
        stream$putright(ss, int$unparse(y) || ":", 5)
        for x: int in int$from_to(0, xs)
            do stream$putright(ss, int$unparse(sudan(n, x, y)), 5) end
    end
    stream$putl(ss, "")
    return(stream$get_contents(ss))
end table

show = proc (n, x, y: int) returns (string)
    return("sudan(" || int$unparse(n) 
            || ", " || int$unparse(x) 
            || ", " || int$unparse(y)
            || ") = " || int$unparse(sudan(n,x,y))) 
end show

start_up = proc ()
    po: stream := stream$primary_output()
    stream$putl(po, table(0, 6, 5))
    stream$putl(po, table(1, 6, 5))
    stream$putl(po, show(1, 3, 3))
    stream$putl(po, show(2, 1, 1))
    stream$putl(po, show(2, 2, 1))
    stream$putl(po, show(3, 1, 1))
end start_up

Output:

sudan(0,x,y):
         0    1    2    3    4    5    6
   0:    0    1    2    3    4    5    6
   1:    1    2    3    4    5    6    7
   2:    2    3    4    5    6    7    8
   3:    3    4    5    6    7    8    9
   4:    4    5    6    7    8    9   10
   5:    5    6    7    8    9   10   11

sudan(1,x,y):
         0    1    2    3    4    5    6
   0:    0    1    2    3    4    5    6
   1:    1    3    5    7    9   11   13
   2:    4    8   12   16   20   24   28
   3:   11   19   27   35   43   51   59
   4:   26   42   58   74   90  106  122
   5:   57   89  121  153  185  217  249

sudan(1, 3, 3) = 35
sudan(2, 1, 1) = 8
sudan(2, 2, 1) = 27
sudan(3, 1, 1) = 10228

Dart

Translation of: C++

int F(int n, int x, int y) {
  if (n == 0) {
    return x + y;
  } else if (y == 0) {
    return x;
  }

  return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
}

void main() {
  print('F(1,3,3) = ${F(1, 3, 3)}');
}

Output:

Same as C++ entry.

Delphi

Works with: Delphi version 6.0

Library: SysUtils,StdCtrls

function SudanFunction(N,X,Y: integer): integer;
begin
if n = 0 then Result:=X + Y
else if y = 0 then Result:=X
else Result:=SudanFunction(N - 1, SudanFunction(N, X, Y - 1), SudanFunction(N, X, Y - 1) + Y);
end;


procedure ShowSudanFunction(Memo: TMemo; N,X,Y: integer);
begin
Memo.Lines.Add(Format('Sudan(%d,%d,%d)=%d',[n,x,y,SudanFunction(N,X,Y)]));
end;


procedure ShowSudanFunctions(Memo: TMemo);
var N,X,Y: integer;
var S: string;
begin
for N:=0 to 1 do
	begin
	Memo.Lines.Add(Format('Sudan(%d,X,Y)',[N]));
	Memo.Lines.Add('Y/X    0   1   2   3   4   5');
	Memo.Lines.Add('----------------------------');
	for Y:=0 to 6 do
		begin
		S:=Format('%2d | ',[Y]);
		for X:=0 to 5 do
			begin
			S:=S+Format('%3d ',[SudanFunction(N,X,Y)]);
			end;
		Memo.Lines.Add(S);
		end;
	Memo.Lines.Add('');
	end;

ShowSudanFunction(Memo, 1, 3, 3);
ShowSudanFunction(Memo, 2, 1, 1);
ShowSudanFunction(Memo, 2, 2, 1);
ShowSudanFunction(Memo, 3, 1, 1);
end;

Output:

Sudan(0,X,Y)
Y/X    0   1   2   3   4   5
----------------------------
 0 |   0   1   2   3   4   5 
 1 |   1   2   3   4   5   6 
 2 |   2   3   4   5   6   7 
 3 |   3   4   5   6   7   8 
 4 |   4   5   6   7   8   9 
 5 |   5   6   7   8   9  10 
 6 |   6   7   8   9  10  11 

Sudan(1,X,Y)
Y/X    0   1   2   3   4   5
----------------------------
 0 |   0   1   2   3   4   5 
 1 |   1   3   5   7   9  11 
 2 |   4   8  12  16  20  24 
 3 |  11  19  27  35  43  51 
 4 |  26  42  58  74  90 106 
 5 |  57  89 121 153 185 217 
 6 | 120 184 248 312 376 440 

Sudan(1,3,3)=35
Sudan(2,1,1)=8
Sudan(2,2,1)=27
Sudan(3,1,1)=10228

Elapsed Time: 47.644 ms.

Draco

proc sudan(word n, x, y) word:
    word k;
    if n=0 then 
        x + y
    elif y=0 then 
        x
    else
        k := sudan(n, x, y-1);
        sudan(n-1, k, k+y)
    fi
corp

proc table(word n, xs, ys) void:
    word x, y;
    writeln("sudan(",n,",x,y):");
    write("     ");
    for x from 0 upto xs do write(x:5) od; 
    for y from 0 upto ys do
        writeln();
        write(y:4, ":");
        for x from 0 upto xs do write(sudan(n,x,y):5) od;
    od;
    writeln();
    writeln()
corp

proc show(word n, x, y) void:
    writeln("sudan(", n:1, ",", x:3, ",", y:3, ") = ", sudan(n,x,y):5)
corp

proc main() void:
    table(0, 6, 5);
    table(1, 6, 5);
    show(1, 3, 3);
    show(2, 1, 1);
    show(2, 2, 1);
    show(3, 1, 1)
corp

Output:

sudan(0,x,y):
         0    1    2    3    4    5    6
   0:    0    1    2    3    4    5    6
   1:    1    2    3    4    5    6    7
   2:    2    3    4    5    6    7    8
   3:    3    4    5    6    7    8    9
   4:    4    5    6    7    8    9   10
   5:    5    6    7    8    9   10   11

sudan(1,x,y):
         0    1    2    3    4    5    6
   0:    0    1    2    3    4    5    6
   1:    1    3    5    7    9   11   13
   2:    4    8   12   16   20   24   28
   3:   11   19   27   35   43   51   59
   4:   26   42   58   74   90  106  122
   5:   57   89  121  153  185  217  249

sudan(1,  3,  3) =    35
sudan(2,  1,  1) =     8
sudan(2,  2,  1) =    27
sudan(3,  1,  1) = 10228

EasyLang

Translation of: C

func f n x y .
   if n = 0
      return x + y
   .
   if y = 0
      return x
   .
   return f (n - 1) f n x (y - 1) (f n x (y - 1) + y)
.
print "F(1,3,3) = " & f 1 3 3

Output:

F(1,3,3) = 35

F#

Translation of: OCaml

let rec sudan = function
   0L, x, y -> x + y
  |_, x, 0L -> x
  |n, x, y -> let x' = sudan (n, x, y-1L) in sudan (n-1L, x', x' + y)
printfn "%d\n%d\n%d" (sudan(1L, 13L, 14L)) (sudan(2L, 5L, 1L)) (sudan(2L, 2L, 2L))

Output:

245744
440
15569256417

Factor

Works with: Factor version 0.99 2022-04-03

USING: combinators kernel math prettyprint ;

: sudan ( n x y -- z )
    {
        { [ pick zero? ] [ nipd + ] }
        { [ dup zero? ] [ drop nip ] }
        [
            [ 2drop 1 - ]
            [ 1 - sudan dup ]
            [ 2nip + sudan ] 3tri
        ]
    } cond ;

3 1 1 sudan .

Output:

10228

Or with locals:

USING: combinators kernel locals math prettyprint ;

:: sudan ( n x y -- z )
    {
        { [ n zero? ] [ x y + ] }
        { [ y zero? ] [ x ] }
        [ n 1 - n x y 1 - sudan dup y + sudan ]
    } cond ;

FreeBASIC

Translation of: Wren and Phyton

Function F(n As Integer, x As Integer, y As Integer) As Integer
    If n = 0 Then Return x + y
    If y = 0 Then Return x
    Return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
End Function

Dim As Integer n, x, y
For n = 0 To 1
    Print " Values of F(" & n & ", x, y):"
    Print " y/x    0   1   2   3   4   5"
    Print String(29, "-")
    For y = 0 To 6
        Print y; "  |";
        For x = 0 To 5
            Print Using "####"; F(n,x,y);
        Next x
        Print
    Next y
    Print
Next n

Print "F(2,1,1) ="; F(2,1,1)
Print "F(3,1,1) ="; F(3,1,1)
Print "F(2,2,1) ="; F(2,2,1)
Sleep

Output:

Same as Wren entry.

FutureBasic

Translation of: C

int local fn F( n as int, x as int, y as int )
  if ( n == 0 ) then return x + y
  if ( y == 0 ) then return x
end fn = fn F( n-1, fn F( n, x, y-1 ), fn F( n, x, y-1 ) + y )

printf @"F(1,3,3) = %d",fn F(1,3,3)

HandleEvents

Output:

F(1,3,3) = 35

Go

Translation of: Wren

package main

import "fmt"

func F(n, x, y int) int {
    if n == 0 {
        return x + y
    }
    if y == 0 {
        return x
    }
    return F(n-1, F(n, x, y-1), F(n, x, y-1)+y)
}

func main() {
    for n := 0; n < 2; n++ {
        fmt.Printf("Values of F(%d, x, y):\n", n)
        fmt.Println("y/x    0   1   2   3   4   5")
        fmt.Println("----------------------------")
        for y := 0; y < 7; y++ {
            fmt.Printf("%d  |", y)
            for x := 0; x < 6; x++ {
                fmt.Printf("%4d", F(n, x, y))
            }
            fmt.Println()
        }
        fmt.Println()
    }
    fmt.Printf("F(2, 1, 1) = %d\n", F(2, 1, 1))
    fmt.Printf("F(3, 1, 1) = %d\n", F(3, 1, 1))
    fmt.Printf("F(2, 2, 1) = %d\n", F(2, 2, 1))
}

Output:

Identical to Wren example.

Haskell

import Control.Monad.Memo (Memo, memo, startEvalMemo)
import Data.List.Split (chunksOf)
import System.Environment (getArgs)
import Text.Tabular (Header(..), Properties(..), Table(..))
import Text.Tabular.AsciiArt (render)

type SudanArgs = (Int, Integer, Integer)

-- Given argument (n, x, y) calculate Fₙ(x, y).  For performance reasons we do
-- the calculation in a memoization monad.
sudan :: SudanArgs -> Memo SudanArgs Integer Integer
sudan (0, x, y) = return $ x + y
sudan (_, x, 0) = return x
sudan (n, x, y) = memo sudan (n, x, y-1) >>= \x2 -> sudan (n-1, x2, x2 + y)

-- A table of Fₙ(x, y) values, where the rows are y values and the columns are
-- x values.
sudanTable :: Int -> [Integer] -> [Integer] -> String
sudanTable n xs ys = render show show show
                   $ Table (Group NoLine $ map Header ys)
                           (Group NoLine $ map Header xs)
                   $ chunksOf (length xs)
                   $ startEvalMemo
                   $ sequence
                   $ [sudan (n, x, y) | y <- ys, x <- xs]

main :: IO ()
main = do
  args <- getArgs
  case args of
    [n, xlo, xhi, ylo, yhi] -> do
      putStrLn $ "Fₙ(x, y), where the rows are y values " ++
                 "and the columns are x values.\n"
      putStr $ sudanTable (read n)
                          [read xlo .. read xhi]
                          [read ylo .. read yhi]
    _ -> error "Usage: sudan n xmin xmax ymin ymax"

Output:

$ sudan 0 0 5 0 6
Fₙ(x, y), where the rows are y values and the columns are x values.

+---++---------------+
|   || 0 1 2 3  4  5 |
+===++===============+
| 0 || 0 1 2 3  4  5 |
| 1 || 1 2 3 4  5  6 |
| 2 || 2 3 4 5  6  7 |
| 3 || 3 4 5 6  7  8 |
| 4 || 4 5 6 7  8  9 |
| 5 || 5 6 7 8  9 10 |
| 6 || 6 7 8 9 10 11 |
+---++---------------+
$ sudan 1 0 5 0 6
Fₙ(x, y), where the rows are y values and the columns are x values.

+---++-------------------------+
|   ||   0   1   2   3   4   5 |
+===++=========================+
| 0 ||   0   1   2   3   4   5 |
| 1 ||   1   3   5   7   9  11 |
| 2 ||   4   8  12  16  20  24 |
| 3 ||  11  19  27  35  43  51 |
| 4 ||  26  42  58  74  90 106 |
| 5 ||  57  89 121 153 185 217 |
| 6 || 120 184 248 312 376 440 |
+---++-------------------------+

Hoon

|=  [n=@ x=@ y=@]
^-  @
|-
?:  =(n 0)
  (add x y)
?:  =(y 0)
  x
$(n (dec n), x $(n n, x x, y (dec y)), y (add $(n n, x x, y (dec y)) y))

J

Translation of: JavaScript

This is, of course, not particularly efficient and some results are too large for a computer to represent.

F=: {{ 'N X Y'=. y assert. N>:0
  if. 0=N do. X+Y
  elseif. Y=0 do. X
  else. F (N-1),(F N,X,Y-1), Y+F N, X, Y-1
  end.
}}"1

Examples:

   F 0 0 0
0
   F 1 1 1
3
   F 2 1 1
8
   F 3 1 1
10228
   F 2 2 1
27

Java

Translation of: C

//Aamrun, 11th July 2022

public class Main {

  private static int F(int n,int x,int y) {
  	if (n == 0) {
    	return x + y;
  	}
 
 	 else if (y == 0) {
    	return x;
  	}
 
  	return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
 }

  public static void main(String[] args) {
    System.out.println("F(1,3,3) = " + F(1,3,3));
  }
}

Output

F(1,3,3) = 35

JavaScript

/**
 * @param {bigint} n
 * @param {bigint} x
 * @param {bigint} y
 * @returns {bigint}
 */
function F(n, x, y) {
  if (n === 0) {
    return x + y;
  }

  if (y === 0) {
    return x;
  }

  return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
}

jq

def sudan(n;x;y):
  if   n == 0 then x+y
  elif y == 0 then x
  else sudan(n-1; sudan(n;x;y-1); sudan(n;x;y-1) + y)
  end;

# For testing and syntactic convenience:
def sudan:
  "sudan(\(.[0]); \(.[1]); \(.[2])) => \(sudan(.[0]; .[1]; .[2]))";

# Illustrations
[0,0,0], [1,1,1], [2,1,1], [3,1,1], [2,2,1]
| sudan

Output:

sudan(0; 0; 0) => 0
sudan(1; 1; 1) => 3
sudan(2; 1; 1) => 8
sudan(3; 1; 1) => 10228
sudan(2; 2; 1) => 27

Julia

using Memoize

@memoize function sudan(n, x, y)
   return n == 0 ? x + y : y == 0 ? x : sudan(n - 1, sudan(n, x, y - 1), sudan(n, x, y - 1) + y)
end

foreach(t -> println("sudan($(t[1]), $(t[2]), $(t[3])) = ",
   sudan(t[1], t[2], t[3])), ((0,0,0), (1,1,1), (2,1,1), (3,1,1), (2,2,1)))

Output:

sudan(0, 0, 0) = 0
sudan(1, 1, 1) = 3
sudan(2, 1, 1) = 8
sudan(3, 1, 1) = 10228
sudan(2, 2, 1) = 27

Lua

function F (n, x, y)
    if n == 0 then
        return x + y
    elseif y == 0 then
        return x
    else
        return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
    end
end

local testCases = {
    {0, 0, 0},
    {1, 1, 1},
    {1, 3, 3},
    {2, 1, 1},
    {2, 2, 1},
    {3, 1, 1}
}

for _, v in pairs(testCases) do
    io.write("F(" .. table.concat(v, ",") .. ") = ")
    print(F(unpack(v)))
end

Output:

F(0,0,0) = 0
F(1,1,1) = 3
F(1,3,3) = 35
F(2,1,1) = 8
F(2,2,1) = 27
F(3,1,1) = 10228

MAD

            NORMAL MODE IS INTEGER
        
          R  WE HAVE TO DEFINE OUR OWN STACK FIRST
            DIMENSION STACK(1000)
            SET LIST TO STACK

          R  SUDAN FUNCTION
            INTERNAL FUNCTION(N,X,Y)
            ENTRY TO SUDAN.

          R  BASE CASES
            WHENEVER N.E.0, FUNCTION RETURN X+Y
            WHENEVER Y.E.0, FUNCTION RETURN X

          R  RECURSIVE CASE - WITH MANUAL STACK MANIPULATION
          R  NOTE WE DON'T NEED X AFTER THE FIRST CALL
            SAVE RETURN
            SAVE DATA N,Y
            K = SUDAN.(N,X,Y-1)
            RESTORE DATA N,Y
            RESTORE RETURN

            SAVE RETURN
            K = SUDAN.(N-1, K, K+Y)
            RESTORE RETURN
            FUNCTION RETURN K
            END OF FUNCTION
            
            INTERNAL FUNCTION(N,X,Y)
            ENTRY TO SHOW.
            VECTOR VALUES FMT = $7HSUDAN.(,I1,1H,,I1,1H,,I1,4H) = ,I8*$
            PRINT FORMAT FMT,N,X,Y,SUDAN.(N,X,Y)
            END OF FUNCTION

            SHOW.(1,3,3)
            SHOW.(2,1,1)
            SHOW.(2,2,1)
            SHOW.(3,1,1)
            END OF PROGRAM

Output:

SUDAN.(1,3,3) =       35
SUDAN.(2,1,1) =        8
SUDAN.(2,2,1) =       27
SUDAN.(3,1,1) =    10228

Mathematica /Wolfram Language

ClearAll[sudan];

sudan[0, x_Integer?NonNegative, y_Integer?NonNegative] := x + y;
sudan[n_Integer?NonNegative, y_Integer?NonNegative, 0] := y;
sudan[n_Integer?NonNegative, x_Integer?NonNegative, 
   y_Integer?NonNegative] := 
  sudan[n - 1, sudan[n, x, y - 1], sudan[n, x, y - 1] + y];

sudan @@@ {{0, 0, 0}, {1, 1, 1}, {1, 3, 3}, {2, 1, 1}, {2, 2, 1}, {3, 1, 1}}

Output:

{0, 3, 35, 8, 27, 10228}

Modula-2

MODULE Sudan;
FROM InOut IMPORT WriteCard, WriteString, WriteLn;

PROCEDURE sudan(n, x, y: CARDINAL): CARDINAL;
    VAR k: CARDINAL;
BEGIN
    IF n = 0 THEN RETURN x+y
    ELSIF y = 0 THEN RETURN x
    ELSE 
        k := sudan(n, x, y-1);
        RETURN sudan(n-1, k, k+y)
    END
END sudan;

PROCEDURE Show(n, x, y: CARDINAL);
BEGIN
    WriteString("sudan(");
    WriteCard(n, 0);
    WriteString(", ");
    WriteCard(x, 0);
    WriteString(", ");
    WriteCard(y, 0);
    WriteString(") = ");
    WriteCard(sudan(n,x,y), 0);
    WriteLn
END Show;

BEGIN
    Show(0, 0, 0);
    Show(1, 1, 1);
    Show(2, 1, 1);
    Show(3, 1, 1);
    Show(2, 2, 1)
END Sudan.

Output:

sudan(0, 0, 0) = 0
sudan(1, 1, 1) = 3
sudan(2, 1, 1) = 8
sudan(3, 1, 1) = 10228
sudan(2, 2, 1) = 27

Nim

import std/[unicode, strformat]

func sudan(n, x, y: Natural): int =
  if n == 0: return x + y
  if y == 0: return x
  let z = sudan(n, x, y - 1)
  return sudan(n - 1, z, z + y)

const Delta = ord("₀".toRunes()[0]) - ord('0')

func subscript(n: Natural): string =
  for c in $n:
    result.add Rune(ord(c) + Delta)

for (n, x, y) in [(0, 0, 0), (1, 1, 1), (2, 1, 1), (2, 2, 1), (2, 2, 2), (3, 1, 1)]:
  echo &"F{subscript(n)}({x}, {y}) = {sudan(n, x, y)}"

Output:

F₀(0, 0) = 0
F₁(1, 1) = 3
F₂(1, 1) = 8
F₂(2, 1) = 27
F₂(2, 2) = 15569256417
F₃(1, 1) = 10228

OCaml

let rec sudan = function
  | 0, x, y -> x + y
  | _, x, 0 -> x
  | n, x, y -> let x' = sudan (n, x, pred y) in sudan (pred n, x', x' + y)

# sudan (1, 13, 14) ;;
- : int = 245744
# sudan (2, 5, 1) ;;    
- : int = 440
# sudan (2, 2, 2) ;;
- : int = 15569256417

REXX

/* REXX implement the SUDAN function */
Say '+---++-------------------------+'
Say '| y ||x= 0   1   2   3   4   5 |'
Say '+===++=========================+'
Do y=0 To 6
  s='|' y '||'
  Do x=0 To 5
    s=s format(sudan(x,y),3)
    End
  Say s '|'
  End
Say '+===++=========================+'
Exit

sudan: Procedure
  Parse Arg x,y
  Return sudan1(1,x,y)

sudan1: Procedure
  Parse Arg n,x,y
  Select
    When n=0 Then Return x+y
    When y=0 Then Return x
    Otherwise Return sudan1(n-1,sudan1(n,x,y-1),sudan1(n,x,y-1)+y)
    End

output:

+---++-------------------------+
| y ||x= 0   1   2   3   4   5 |
+===++=========================+
| 0 ||   0   1   2   3   4   5 |
| 1 ||   1   3   5   7   9  11 |
| 2 ||   4   8  12  16  20  24 |
| 3 ||  11  19  27  35  43  51 |
| 4 ||  26  42  58  74  90 106 |
| 5 ||  57  89 121 153 185 217 |
| 6 || 120 184 248 312 376 440 |
+===++=========================+

Pascal

Free Pascal

Translation of: Delphi

program Sudan;
//trans  https://rosettacode.org/wiki/Sudan_function#Delphi
{$IFDEF FPC} {$MODE DELPHI} {$OPTIMIZATION ON,ALL}{$ENDIF}
{$IFDEF WINDOWS}{$APPTYPE CONSOLE}{$ENDIF}
uses
  sysutils;
function SudanFunction(N,X,Y: UInt64): UInt64;
begin
  if n = 0 then 
    Result:=X + Y
   else
     if y = 0 then 
       Result:=X
     else 
       Result:=SudanFunction(N - 1, SudanFunction(N, X, Y - 1), SudanFunction(N, X, Y - 1) + Y);
end;

procedure ShowSudanFunction(N,X,Y: UInt64);
begin
  writeln(Format('Sudan(%d,%d,%d)=%d',[n,x,y,SudanFunction(N,X,Y)]));
end;

procedure ShowSudanFunctions;
var 
  N,X,Y: UInt64;
  S: string;
begin
for N:=0 to 1 do
	begin
	writeln(Format('Sudan(%d,X,Y)',[N]));
	writeln('Y/X    0   1   2   3   4   5');
	writeln('----------------------------');
	for Y:=0 to 6 do
		begin
		S:=Format('%2d | ',[Y]);
		for X:=0 to 5 do
			begin
			S:=S+Format('%3d ',[SudanFunction(N,X,Y)]);
			end;
		writeln(S);
		end;
	writeln('');
	end;
end;	

BEGIN
  ShowSudanFunctions;
  ShowSudanFunction( 1, 3, 3);
  ShowSudanFunction( 2, 1, 1);
  ShowSudanFunction( 2, 2, 1);
  ShowSudanFunction( 2, 1, 2);  
  ShowSudanFunction( 3, 1, 1);  
  ShowSudanFunction( 2, 2, 2);
END.

@TIO.RUN:

Sudan(0,X,Y)
Y/X    0   1   2   3   4   5
----------------------------

0 |   0   1   2   3   4   5 
1 |   1   2   3   4   5   6 
2 |   2   3   4   5   6   7 
3 |   3   4   5   6   7   8 
4 |   4   5   6   7   8   9 
5 |   5   6   7   8   9  10 
6 |   6   7   8   9  10  11 

Sudan(1,X,Y)
Y/X    0   1   2   3   4   5
----------------------------

0 |   0   1   2   3   4   5 
1 |   1   3   5   7   9  11 
2 |   4   8  12  16  20  24 
3 |  11  19  27  35  43  51 
4 |  26  42  58  74  90 106 
5 |  57  89 121 153 185 217 
6 | 120 184 248 312 376 440 

Sudan(1,3,3)=35
Sudan(2,1,1)=8
Sudan(2,2,1)=27
Sudan(2,1,2)=10228
Sudan(3,1,1)=10228
Sudan(2,2,2)=15569256417

Real time: 3.822 s CPU share: 98.74 %

PascalABC.NET

function F(n,x,y: integer): integer;
begin
  if n = 0 then
    Result := x + y
  else if y = 0 then
    Result := x
  else Result := F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y);
end;

begin
  F(1,3,3).Println;
end.

Output:

35

Perl

Three ways of doing the same thing.

use v5.36;
use experimental 'for_list';

sub F1($n, $x, $y) { $n ? $y ? F1($n-1, F2($n,$x,$y-1), F3($n,$x,$y-1)+$y) : $x : $x+$y }

sub F2($n, $x, $y) { $n == 0 ? $x+$y : $y == 0 ? $x : F2($n-1, F1($n,$x,$y-1), F3($n,$x,$y-1)+$y) }

sub F3($n, $x, $y) {
  return $x + $y if $n == 0;
  return $x      if $y == 0;
  F3($n-1, F1($n, $x, $y-1), F2($n, $x, $y-1) + $y)
}

for my($n,$x,$y) (0,0,0, 1,1,1, 2,1,1, 3,1,1, 2,2,1) {
    say join ' ',F1($n,$x,$y), F2($n,$x,$y), F3($n,$x,$y)
}

Output:

0 0 0
3 3 3
8 8 8
10228 10228 10228
27 27 27

Phix

with javascript_semantics
function F(integer n, x, y)
    if n=0 then return x+y end if
    if y=0 then return x end if
    integer t = F(n,x,y-1)
    return F(n-1,t,t+y)
end function
 
for n=0 to 1 do
    printf(1,"Values of F(%d, x, y):\n",n)
    printf(1,"y/x    0   1   2   3   4   5\n")
    printf(1,"----------------------------\n")
    for y=0 to 6 do
        sequence r = apply(true,F,{n,tagset(5,0),y})
        printf(1,"%d  |%s\n",{y,join(r,"",fmt:="%4d")})
    end for
    printf(1,"\n")
end for

for t in {{2,1,1},{3,1,1},{2,2,1}} do
    integer {n,x,y} = t
    printf(1,"F(%d, %d, %d) = %d\n",{n,x,y,F(n,x,y)})
end for

Output same as Wren.

PHP

Translation of: C

#Aamrun , 11th July 2022

<?php
function F(int $n,int $x,int $y) {
  if ($n == 0) {
    return $x + $y;
  }
 
  else if ($y == 0) {
    return $x;
  }
 
  return F($n - 1, F($n, $x, $y - 1), F($n, $x, $y - 1) + $y);
}
echo "F(1,3,3) = " . F(1,3,3); 
?>

Output

F(1,3,3) = 35

Python

Translation of: JavaScript

# Aamrun, 11th July 2022

def F(n,x,y):
  if n==0:
    return x + y
  elif y==0:
    return x
  else:
    return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
    
    
print("F(1,3,3) = ", F(1,3,3))

Output

F(1,3,3) =  35

Quackery

  [ rot dup 0 = iff
      [ drop + ] done
    over 0 = iff
      2drop      done
    over temp put
    dup 1 -
    swap 2swap 1 -
    recurse
    dup temp take +
    again ]           is sudan ( n x y --> f(n) )
    
  ' [ [ 0 0 0 ]
      [ 1 1 1 ]
      [ 1 3 3 ]
      [ 2 1 1 ]
      [ 2 2 1 ]
      [ 3 1 1 ] ]
  witheach
    [ dup echo say " = "
    do sudan echo cr ]

Output:

[ 0 0 0 ] = 0
[ 1 1 1 ] = 3
[ 1 3 3 ] = 35
[ 2 1 1 ] = 8
[ 2 2 1 ] = 27
[ 3 1 1 ] = 10228

R

Translation of: C

#Aamrun, 11th July 2022

F <- function(n, x, y) {
  if(n==0){
  	F <- x+y
    return (F)
  }
  
  else if(y == 0) {
    F <- x
    return (F)
  }
 
  F <- F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
  return (F)
}

print(paste("F(1,3,3) = " , F(1,3,3)))

Output

[1] "F(1,3,3) =  35"

Raku

Outputting wiki-tables to more closely emulate the wikipedia examples. Not very efficient but good enough.

multi F (0, $x, $y) { $x + $y }
multi F ($n where * > 0, $x, 0) { $x }
multi F ($n, $x, $y) { F($n-1, F($n, $x, $y-1), F($n, $x, $y-1) + $y) }

# Testing
for 0, 6, 1, 15 -> $f, $g {
    my @range = ^$g;
    say "\{|class=\"wikitable\"\n", "|+ F\<sub>$f\</sub> (x,y)\n" ~ '!x\y!!', join '!!', @range;
    -> $r { say "|-\n" ~ '|' ~ join '||', $r, @range.map:{ F($f, $r, $_) } } for @range;
    say( "|}" );
}

Output:

F₀ (x,y)

x\y	0	1	2	3	4	5
0	0	1	2	3	4	5
1	1	2	3	4	5	6
2	2	3	4	5	6	7
3	3	4	5	6	7	8
4	4	5	6	7	8	9
5	5	6	7	8	9	10

F₁ (x,y)

x\y	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
0	0	1	4	11	26	57	120	247	502	1013	2036	4083	8178	16369	32752
1	1	3	8	19	42	89	184	375	758	1525	3060	6131	12274	24561	49136
2	2	5	12	27	58	121	248	503	1014	2037	4084	8179	16370	32753	65520
3	3	7	16	35	74	153	312	631	1270	2549	5108	10227	20466	40945	81904
4	4	9	20	43	90	185	376	759	1526	3061	6132	12275	24562	49137	98288
5	5	11	24	51	106	217	440	887	1782	3573	7156	14323	28658	57329	114672
6	6	13	28	59	122	249	504	1015	2038	4085	8180	16371	32754	65521	131056
7	7	15	32	67	138	281	568	1143	2294	4597	9204	18419	36850	73713	147440
8	8	17	36	75	154	313	632	1271	2550	5109	10228	20467	40946	81905	163824
9	9	19	40	83	170	345	696	1399	2806	5621	11252	22515	45042	90097	180208
10	10	21	44	91	186	377	760	1527	3062	6133	12276	24563	49138	98289	196592
11	11	23	48	99	202	409	824	1655	3318	6645	13300	26611	53234	106481	212976
12	12	25	52	107	218	441	888	1783	3574	7157	14324	28659	57330	114673	229360
13	13	27	56	115	234	473	952	1911	3830	7669	15348	30707	61426	122865	245744
14	14	29	60	123	250	505	1016	2039	4086	8181	16372	32755	65522	131057	262128

RPL

Works with: HP version 48-R

« IF DUP2 2 GET AND THEN 
     DUP 2 GET 3 PICK ROT { 0 1 } - SUDAN
     SWAP OVER + 2 →LIST SWAP 1 - SWAP SUDAN
  ELSE ∑LIST SWAP DROP END
» 'SUDAN' STO     @ ( n { x y } ) → Fn(x,y) )

{ { 0 { 0 0 } } { 1 { 1 1 } } { 1 { 3 3 } } { 2 { 1 1 } } { 2 { 2 1 } } { 3 { 1 1 } } } 1 « EVAL SUDAN » DOLIST

Output:

1: { 0 3 35 8 27 10228 }

Ruby

def sudan(n, x, y)
  return x + y if n == 0
  return x if y == 0

  sudan(n - 1, sudan(n, x, y - 1), sudan(n, x, y - 1) + y)
end

Output

puts sudan(1, 3, 3)
> 35

Swift

Translation of: C

I have started working on Swift and am going to practice on RosettaCode. On converting my C implementation for this task to Swift which I contributed last year, I found Swift allows statement ending semicolons and enclosing parantheses in if/else statements which are mandatory in C. I didn't find that anywhere while learning Swift so I am posting both implementations here, the "C like" and the "Pure" Swift.

Both have been tested with Xcode 14.2 (14C18)

C like

//Aamrun, 3rd February 2023

func F(n: Int,x: Int,y: Int) -> Int {
  if (n == 0) {
    return x + y;
  }

  else if (y == 0) {
    return x;
  }

    return F(n: n - 1, x: F(n: n, x: x, y: y - 1), y: F(n: n, x: x, y: y - 1) + y);
}

print("F1(3,3) = " + String(F(n: 1,x: 3,y: 3)));

Pure Swift

//Aamrun, 3rd February 2023

func F(n: Int,x: Int,y: Int) -> Int {
  if n == 0 {
    return x + y
  }

  else if y == 0 {
    return x
  }

    return F(n: n - 1, x: F(n: n, x: x, y: y - 1), y: F(n: n, x: x, y: y - 1) + y)
}

print("F1(3,3) = " + String(F(n: 1,x: 3,y: 3)))

Output is the same for both

Output:

F1(3,3) = 35

V (Vlang)

Translation of: Wren

fn sudan(n int, x int, y int) int {
    if n == 0 {
       return x + y
    }
    if y == 0 {
        return x
    }
    return sudan(n-1, sudan(n, x, y-1), sudan(n, x, y-1) + y)
}

fn main() {
    for n := 0; n < 2; n++ {
        println("Values of F($n, x, y):")
        println("y/x    0   1   2   3   4   5")
        println("----------------------------")
        for y := 0; y < 7; y++ {
            print("$y  |")
            for x := 0; x < 6; x++ {
                s := sudan(n, x, y)
                print("${s:4}")
            }
            println('')
        }
        println('')
    }
    println("F(2, 1, 1) = ${sudan(2, 1, 1)}")
    println("F(3, 1, 1) = ${sudan(3, 1, 1)}")
    println("F(2, 2, 1) = ${sudan(2, 2, 1)}")
}

Output:

Identical to Wren example.

Wren

Library: Wren-fmt

import "./fmt" for Fmt

var F = Fn.new { |n, x, y|
    if (n == 0) return x + y
    if (y == 0) return x
    return F.call(n - 1, F.call(n, x, y-1), F.call(n, x, y-1) + y)
}

for (n in 0..1) {
    System.print("Values of F(%(n), x, y):")
    System.print("y/x    0   1   2   3   4   5")
    System.print("----------------------------")
    for (y in 0..6) {
        System.write("%(y)  |")
        for (x in 0..5) {
            var sudan = F.call(n, x, y)
            Fmt.write("$4d", sudan)
        }
        System.print()
    }
    System.print()
}
System.print("F(2, 1, 1) = %(F.call(2, 1, 1))")
System.print("F(3, 1, 1) = %(F.call(3, 1, 1))")
System.print("F(2, 2, 1) = %(F.call(2, 2, 1))")

Output:

Values of F(0, x, y):
y/x    0   1   2   3   4   5
----------------------------
0  |   0   1   2   3   4   5
1  |   1   2   3   4   5   6
2  |   2   3   4   5   6   7
3  |   3   4   5   6   7   8
4  |   4   5   6   7   8   9
5  |   5   6   7   8   9  10
6  |   6   7   8   9  10  11

Values of F(1, x, y):
y/x    0   1   2   3   4   5
----------------------------
0  |   0   1   2   3   4   5
1  |   1   3   5   7   9  11
2  |   4   8  12  16  20  24
3  |  11  19  27  35  43  51
4  |  26  42  58  74  90 106
5  |  57  89 121 153 185 217
6  | 120 184 248 312 376 440

F(2, 1, 1) = 8
F(3, 1, 1) = 10228
F(2, 2, 1) = 27

XPL0

Translation of: Wren

func F; int N, X, Y;
[if N = 0 then return X + Y;
 if Y = 0 then return X;
return F(N-1, F(N, X, Y-1), F(N, X, Y-1) + Y);
];
 
int N, X, Y;
[Format(4, 0);
for N:= 0 to 1 do
    [Text(0, "Values of F("); IntOut(0, N);  Text(0, ", X, Y):^m^j");
     Text(0, "Y/X    0   1   2   3   4   5^m^j");
     Text(0, "----------------------------^m^j");
     for Y:= 0 to 6 do
        [IntOut(0, Y);  Text(0, "  |");
        for X:= 0 to 5 do
            RlOut(0, float(F(N, X, Y)));
        CrLf(0);
        ];
    CrLf(0);
    ];
Text(0, "F(2, 1, 1) = ");  IntOut(0, F(2, 1, 1));  CrLf(0);
Text(0, "F(3, 1, 1) = ");  IntOut(0, F(3, 1, 1));  CrLf(0);
Text(0, "F(2, 2, 1) = ");  IntOut(0, F(2, 2, 1));  CrLf(0);
]

Output:

Values of F(0, X, Y):
Y/X    0   1   2   3   4   5
----------------------------
0  |   0   1   2   3   4   5
1  |   1   2   3   4   5   6
2  |   2   3   4   5   6   7
3  |   3   4   5   6   7   8
4  |   4   5   6   7   8   9
5  |   5   6   7   8   9  10
6  |   6   7   8   9  10  11

Values of F(1, X, Y):
Y/X    0   1   2   3   4   5
----------------------------
0  |   0   1   2   3   4   5
1  |   1   3   5   7   9  11
2  |   4   8  12  16  20  24
3  |  11  19  27  35  43  51
4  |  26  42  58  74  90 106
5  |  57  89 121 153 185 217
6  | 120 184 248 312 376 440

F(2, 1, 1) = 8
F(3, 1, 1) = 10228
F(2, 2, 1) = 27