Magic squares of doubly even order
You are encouraged to solve this task according to the task description, using any language you may know.
A magic square is an NxN square matrix whose numbers consist of consecutive numbers arranged so that the sum of each row and column, and both diagonals are equal to the same sum (which is called the magic number or magic constant).
A magic square of doubly even order has a size that is a multiple of four (e.g. 4, 8, 12). This means that the subsquares also have an even size, which plays a role in the construction.
| 1 | 2 | 62 | 61 | 60 | 59 | 7 | 8 |
| 9 | 10 | 54 | 53 | 52 | 51 | 15 | 16 |
| 48 | 47 | 19 | 20 | 21 | 22 | 42 | 41 |
| 40 | 39 | 27 | 28 | 29 | 30 | 34 | 33 |
| 32 | 31 | 35 | 36 | 37 | 38 | 26 | 25 |
| 24 | 23 | 43 | 44 | 45 | 46 | 18 | 17 |
| 49 | 50 | 14 | 13 | 12 | 11 | 55 | 56 |
| 57 | 58 | 6 | 5 | 4 | 3 | 63 | 64 |
- Task
Create a magic square of 8 x 8.
- Related tasks
- See also
360 Assembly
<lang 360asm>* Magic squares of doubly even order 01/03/2017 MAGICSDB CSECT
USING MAGICSDB,R13
B 72(R15) skip save area
DC 17F'0' save area
STM R14,R12,12(R13)
ST R13,4(R15)
ST R15,8(R13)
LR R13,R15 end of prolog
SR R8,R8 k=0
LA R6,0 i=0
DO WHILE=(C,R6,LE,=A(N-1)) do i=0 to n-1
MVC PG,=CL80' ' clear buffer
LA R9,PG pgi=0
LA R7,0 j=0
DO WHILE=(C,R7,LE,=A(N-1)) do j=0 to n-1
LR R4,R7 j
SRDA R4,32 >>r5
D R4,MULT /mult
LR R2,R5 r2=j/mult
LR R4,R6 i
SRDA R4,32 >>r5
D R4,MULT /mult
SLA R5,2 r5=(i/mult)*4
AR R2,R5 bitpos=j/mult+(i/mult)*4
STC R2,XSLL+3 number_of_shift=bitpos
L R5,=F'1' 1
EX 0,XSLL r5=1<<bitpos (SLL R5,bitpos)
L R4,BITS bits
NR R4,R5 bits and (1<<bitpos)
IF LTR,R4,NZ,R4 THEN if (bits and (1<<bitpos))<>0
LA R10,1(R8) x=k+1
ELSE , else
L R10,SIZE size
SR R10,R8 x=size-k
ENDIF , endif
XDECO R10,XDEC edit x
MVC 0(4,R9),XDEC+8 output x
LA R9,4(R9) pgi+=4
LA R8,1(R8) k++
LA R7,1(R7) j++
ENDDO , enddo j
XPRNT PG,L'PG print buffer
LA R6,1(R6) i++
ENDDO , enddo i
MVC PG,=CL80'magic constant='
L R1,=A((N*N+1)*N/2) magicnum=(n*n+1)*n/2
XDECO R1,XDEC edit magicnum
MVC PG+15(4),XDEC+8 output magicnum
XPRNT PG,L'PG print buffer
L R13,4(0,R13) epilog
LM R14,R12,12(R13)
XR R15,R15 rc=0
BR R14 exit
XSLL SLL R5,0 shift left logical N EQU 8 <= input value n SIZE DC A(N*N) size=n*n MULT DC A(N/4) mult=n/4 (multiple of 4) BITS DC XL2'0000',BL2'1001011001101001' pattern PG DS CL80 buffer XDEC DS CL12 temp for xdeco
YREGS
END MAGICSDB</lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 magic constant= 260
AppleScript
<lang AppleScript>-- MAGIC SQUARE OF DOUBLY EVEN ORDER -----------------------------------------
-- magicSquare :: Int -> Int on magicSquare(n)
if n mod 4 > 0 then
{}
else
set sqr to n * n
set maybePowerOfTwo to asPowerOfTwo(sqr)
if maybePowerOfTwo is not missing value then
-- For powers of 2, the (append not) 'magic' series directly
-- yields the truth table that we need
set truthSeries to magicSeries(maybePowerOfTwo)
else
-- where n is not a power of 2, we can replicate a
-- minimum truth table, horizontally and vertically
script scale
on |λ|(x)
replicate(n / 4, x)
end |λ|
end script
set truthSeries to ¬
flatten(scale's |λ|(map(scale, splitEvery(4, magicSeries(4)))))
end if
set limit to sqr + 1
script inOrderOrReversed
on |λ|(x, i)
cond(x, i, limit - i)
end |λ|
end script
-- Taken directly from an integer series [1..sqr] where True
-- and from the reverse of that series where False
splitEvery(n, map(inOrderOrReversed, truthSeries))
end if
end magicSquare
-- magicSeries :: Int -> [Bool] on magicSeries(n)
script boolToggle
on |λ|(x)
not x
end |λ|
end script
if n ≤ 0 then
{true}
else
set xs to magicSeries(n - 1)
xs & map(boolToggle, xs)
end if
end magicSeries
-- TEST ----------------------------------------------------------------------
on run
formattedTable(magicSquare(8))
end run
-- formattedTable :: Int -> String on formattedTable(lstTable)
set n to length of lstTable
set w to 2.5 * n
"magic(" & n & ")" & linefeed & wikiTable(lstTable, ¬
false, "text-align:center;width:" & ¬
w & "em;height:" & w & "em;table-layout:fixed;")
end formattedTable
-- wikiTable :: [Text] -> Bool -> Text -> Text on wikiTable(lstRows, blnHdr, strStyle)
script fWikiRows
on |λ|(lstRow, iRow)
set strDelim to cond(blnHdr and (iRow = 0), "!", "|")
set strDbl to strDelim & strDelim
linefeed & "|-" & linefeed & strDelim & space & ¬
intercalate(space & strDbl & space, lstRow)
end |λ|
end script
linefeed & "{| class=\"wikitable\" " & ¬
cond(strStyle ≠ "", "style=\"" & strStyle & "\"", "") & ¬
intercalate("", ¬
map(fWikiRows, lstRows)) & linefeed & "|}" & linefeed
end wikiTable
-- GENERIC FUNCTIONS ---------------------------------------------------------
-- asPowerOfTwo :: Int -> maybe Int on asPowerOfTwo(n)
if not isPowerOf(2, n) then
missing value
else
set strCMD to ("echo 'l(" & n as string) & ")/l(2)' | bc -l"
(do shell script strCMD) as integer
end if
end asPowerOfTwo
-- concatMap :: (a -> [b]) -> [a] -> [b] on concatMap(f, xs)
script append
on |λ|(a, b)
a & b
end |λ|
end script
foldl(append, {}, map(f, xs))
end concatMap
-- cond :: Bool -> a -> a -> a on cond(bool, f, g)
if bool then
f
else
g
end if
end cond
-- flatten :: Tree a -> [a] on flatten(t)
if class of t is list then
concatMap(my flatten, t)
else
t
end if
end flatten
-- foldl :: (a -> b -> a) -> a -> [b] -> a on foldl(f, startValue, xs)
tell mReturn(f)
set v to startValue
set lng to length of xs
repeat with i from 1 to lng
set v to |λ|(v, item i of xs, i, xs)
end repeat
return v
end tell
end foldl
-- intercalate :: Text -> [Text] -> Text on intercalate(strText, lstText)
set {dlm, my text item delimiters} to {my text item delimiters, strText}
set strJoined to lstText as text
set my text item delimiters to dlm
return strJoined
end intercalate
-- isPowerOf :: Int -> Int -> Bool on isPowerOf(k, n)
set v to k
script remLeft
on |λ|(x)
x mod v is not 0
end |λ|
end script
script integerDiv
on |λ|(x)
x div v
end |λ|
end script
|until|(remLeft, integerDiv, n) = 1
end isPowerOf
-- map :: (a -> b) -> [a] -> [b] on map(f, xs)
tell mReturn(f)
set lng to length of xs
set lst to {}
repeat with i from 1 to lng
set end of lst to |λ|(item i of xs, i, xs)
end repeat
return lst
end tell
end map
-- Lift 2nd class handler function into 1st class script wrapper
-- mReturn :: Handler -> Script
on mReturn(f)
if class of f is script then
f
else
script
property |λ| : f
end script
end if
end mReturn
-- Egyptian multiplication - progressively doubling a list, appending -- stages of doubling to an accumulator where needed for binary -- assembly of a target length
-- replicate :: Int -> a -> [a] on replicate(n, a)
set out to {}
if n < 1 then return out
set dbl to {a}
repeat while (n > 1)
if (n mod 2) > 0 then set out to out & dbl
set n to (n div 2)
set dbl to (dbl & dbl)
end repeat
return out & dbl
end replicate
-- splitAt :: Int -> [a] -> ([a],[a]) on splitAt(n, xs)
if n > 0 and n < length of xs then
if class of xs is text then
{items 1 thru n of xs as text, items (n + 1) thru -1 of xs as text}
else
{items 1 thru n of xs, items (n + 1) thru -1 of xs}
end if
else
if n < 1 then
{{}, xs}
else
{xs, {}}
end if
end if
end splitAt
-- splitEvery :: Int -> [a] -> a on splitEvery(n, xs)
if length of xs ≤ n then
{xs}
else
set {gp, t} to splitAt(n, xs)
{gp} & splitEvery(n, t)
end if
end splitEvery
-- until :: (a -> Bool) -> (a -> a) -> a -> a on |until|(p, f, x)
set mp to mReturn(p)
set v to x
tell mReturn(f)
repeat until mp's |λ|(v)
set v to |λ|(v)
end repeat
end tell
return v
end |until|</lang>
- Output:
magic(8)
| 1 | 63 | 62 | 4 | 60 | 6 | 7 | 57 |
| 56 | 10 | 11 | 53 | 13 | 51 | 50 | 16 |
| 48 | 18 | 19 | 45 | 21 | 43 | 42 | 24 |
| 25 | 39 | 38 | 28 | 36 | 30 | 31 | 33 |
| 32 | 34 | 35 | 29 | 37 | 27 | 26 | 40 |
| 41 | 23 | 22 | 44 | 20 | 46 | 47 | 17 |
| 49 | 15 | 14 | 52 | 12 | 54 | 55 | 9 |
| 8 | 58 | 59 | 5 | 61 | 3 | 2 | 64 |
Befunge
The size, N, is specified by the first value on the stack. The algorithm is loosely based on the Java implementation.
<lang befunge>8>>>v>10p00g:*1-*\110g2*-*+1+.:00g%!9+,:#v_@ p00:<^:!!-!%3//4g00%g00\!!%3/*:g00*4:::-1<*:</lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64
C
Takes number of rows from command line, prints out usage on incorrect invocation. <lang C>
- include<stdlib.h>
- include<ctype.h>
- include<stdio.h>
int** doublyEvenMagicSquare(int n) { if (n < 4 || n % 4 != 0) return NULL;
int bits = 38505; int size = n * n; int mult = n / 4,i,r,c,bitPos;
int** result = (int**)malloc(n*sizeof(int*));
for(i=0;i<n;i++) result[i] = (int*)malloc(n*sizeof(int));
for (r = 0, i = 0; r < n; r++) { for (c = 0; c < n; c++, i++) { bitPos = c / mult + (r / mult) * 4; result[r][c] = (bits & (1 << bitPos)) != 0 ? i + 1 : size - i; } } return result; }
int numDigits(int n){ int count = 1;
while(n>=10){ n /= 10; count++; }
return count; }
void printMagicSquare(int** square,int rows){ int i,j,baseWidth = numDigits(rows*rows) + 3;
printf("Doubly Magic Square of Order : %d and Magic Constant : %d\n\n",rows,(rows * rows + 1) * rows / 2);
for(i=0;i<rows;i++){ for(j=0;j<rows;j++){ printf("%*s%d",baseWidth - numDigits(square[i][j]),"",square[i][j]); } printf("\n"); } }
int main(int argC,char* argV[]) { int n;
if(argC!=2||isdigit(argV[1][0])==0) printf("Usage : %s <integer specifying rows in magic square>",argV[0]); else{ n = atoi(argV[1]); printMagicSquare(doublyEvenMagicSquare(n),n); } return 0; } </lang> Invocation and Output :
C:\rosettaCode>doublyEvenMagicSquare 12
Doubly Magic Square of Order : 12 and Magic Constant : 870
1 2 3 141 140 139 138 137 136 10 11 12
13 14 15 129 128 127 126 125 124 22 23 24
25 26 27 117 116 115 114 113 112 34 35 36
108 107 106 40 41 42 43 44 45 99 98 97
96 95 94 52 53 54 55 56 57 87 86 85
84 83 82 64 65 66 67 68 69 75 74 73
72 71 70 76 77 78 79 80 81 63 62 61
60 59 58 88 89 90 91 92 93 51 50 49
48 47 46 100 101 102 103 104 105 39 38 37
109 110 111 33 32 31 30 29 28 118 119 120
121 122 123 21 20 19 18 17 16 130 131 132
133 134 135 9 8 7 6 5 4 142 143 144
C++
<lang cpp>#include <iostream>
- include <sstream>
- include <iomanip>
using namespace std;
class magicSqr { public:
magicSqr( int d ) {
while( d % 4 > 0 ) { d++; }
sz = d;
sqr = new int[sz * sz];
fillSqr();
}
~magicSqr() { delete [] sqr; }
void display() const {
cout << "Doubly Even Magic Square: " << sz << " x " << sz << "\n";
cout << "It's Magic Sum is: " << magicNumber() << "\n\n";
ostringstream cvr; cvr << sz * sz;
int l = cvr.str().size();
for( int y = 0; y < sz; y++ ) {
int yy = y * sz;
for( int x = 0; x < sz; x++ ) {
cout << setw( l + 2 ) << sqr[yy + x];
}
cout << "\n";
}
cout << "\n\n";
}
private:
void fillSqr() {
static const bool tempAll[4][4] = {{ 1, 0, 0, 1 }, { 0, 1, 1, 0 }, { 0, 1, 1, 0 }, { 1, 0, 0, 1 } };
int i = 0;
for( int curRow = 0; curRow < sz; curRow++ ) {
for( int curCol = 0; curCol < sz; curCol++ ) {
sqr[curCol + sz * curRow] = tempAll[curRow % 4][curCol % 4] ? i + 1 : sz * sz - i;
i++;
}
}
}
int magicNumber() const { return sz * ( ( sz * sz ) + 1 ) / 2; }
int* sqr;
int sz;
};
int main( int argc, char* argv[] ) {
magicSqr s( 8 ); s.display(); return 0;
}</lang>
- Output:
Doubly Even Magic Square: 8 x 8 It's Magic Sum is: 260 1 63 62 4 5 59 58 8 56 10 11 53 52 14 15 49 48 18 19 45 44 22 23 41 25 39 38 28 29 35 34 32 33 31 30 36 37 27 26 40 24 42 43 21 20 46 47 17 16 50 51 13 12 54 55 9 57 7 6 60 61 3 2 64
C#
<lang csharp>using System;
namespace MagicSquareDoublyEven {
class Program
{
static void Main(string[] args)
{
int n = 8;
var result = MagicSquareDoublyEven(n);
for (int i = 0; i < result.GetLength(0); i++)
{
for (int j = 0; j < result.GetLength(1); j++)
Console.Write("{0,2} ", result[i, j]);
Console.WriteLine();
}
Console.WriteLine("\nMagic constant: {0} ", (n * n + 1) * n / 2);
Console.ReadLine();
}
private static int[,] MagicSquareDoublyEven(int n)
{
if (n < 4 || n % 4 != 0)
throw new ArgumentException("base must be a positive "
+ "multiple of 4");
// pattern of count-up vs count-down zones
int bits = 0b1001_0110_0110_1001;
int size = n * n;
int mult = n / 4; // how many multiples of 4
int[,] result = new int[n, n];
for (int r = 0, i = 0; r < n; r++)
{
for (int c = 0; c < n; c++, i++)
{
int bitPos = c / mult + (r / mult) * 4;
result[r, c] = (bits & (1 << bitPos)) != 0 ? i + 1 : size - i;
}
}
return result;
}
}
}</lang>
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant: 260
D
<lang D>import std.stdio;
void main() {
int n=8;
foreach(row; magicSquareDoublyEven(n)) {
foreach(col; row) {
writef("%2s ", col);
}
writeln;
}
writeln("\nMagic constant: ", (n*n+1)*n/2);
}
int[][] magicSquareDoublyEven(int n) {
import std.exception; enforce(n>=4 && n%4 == 0, "Base must be a positive multiple of 4");
int bits = 0b1001_0110_0110_1001; int size = n * n; int mult = n / 4; // how many multiples of 4
int[][] result;
result.length = n;
foreach(i; 0..n) {
result[i].length = n;
}
for (int r=0, i=0; r<n; r++) {
for (int c=0; c<n; c++, i++) {
int bitPos = c / mult + (r / mult) * 4;
result[r][c] = (bits & (1 << bitPos)) != 0 ? i + 1 : size - i;
}
}
return result;
}</lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant: 260
Elena
ELENA 3.4 : <lang elena>import system'routines. import extensions. import extensions'routines.
MagicSquareDoublyEven = (:n)<int> [
if((n < 4)||(n mod(4) != 0))
[ InvalidArgumentException new:"base must be a positive multiple of 4" ].
int bits := 09669h.
int size := n * n.
int mult := n / 4.
var result := IntMatrix new(n,n).
int r := 0.
int i := 0.
while (r < n)
[
int c := 0.
while(c < n)
[
int bitPos := c / mult + (r / mult) * 4.
result[r][c] := ((bits && (1 << bitPos)) != 0)iif(i+1,size - i).
i += 1.
c += 1.
].
r += 1.
].
^ result
].
public program [
int n := 8.
console printLine(MagicSquareDoublyEven(n)).
console printLine; printLine("Magic constant: ",(n * n + 1) * n / 2).
]</lang>
- Output:
1,2,62,61,60,59,7,8 9,10,54,53,52,51,15,16 48,47,19,20,21,22,42,41 40,39,27,28,29,30,34,33 32,31,35,36,37,38,26,25 24,23,43,44,45,46,18,17 49,50,14,13,12,11,55,56 57,58,6,5,4,3,63,64 Magic constant: 260
Elixir
<lang elixir>defmodule Magic_square do
def doubly_even(n) when rem(n,4)!=0, do: raise ArgumentError, "must be even, but not divisible by 4."
def doubly_even(n) do
n2 = n * n
Enum.zip(1..n2, make_pattern(n))
|> Enum.map(fn {i,p} -> if p, do: i, else: n2 - i + 1 end)
|> Enum.chunk(n)
|> to_string(n)
|> IO.puts
end
defp make_pattern(n) do
pattern = Enum.reduce(1..4, [true], fn _,acc ->
acc ++ Enum.map(acc, &(!&1))
end) |> Enum.chunk(4)
for i <- 0..n-1, j <- 0..n-1, do: Enum.at(pattern, rem(i,4)) |> Enum.at(rem(j,4))
end
defp to_string(square, n) do
format = String.duplicate("~#{length(to_char_list(n*n))}w ", n) <> "\n"
Enum.map_join(square, fn row ->
:io_lib.format(format, row)
end)
end
end
Magic_square.doubly_even(8)</lang>
- Output:
1 63 62 4 5 59 58 8 56 10 11 53 52 14 15 49 48 18 19 45 44 22 23 41 25 39 38 28 29 35 34 32 33 31 30 36 37 27 26 40 24 42 43 21 20 46 47 17 16 50 51 13 12 54 55 9 57 7 6 60 61 3 2 64
FreeBASIC
<lang freebasic>' version 18-03-2016 ' compile with: fbc -s console ' doubly even magic square 4, 8, 12, 16...
Sub Err_msg(msg As String)
Print msg Beep : Sleep 5000, 1 : Exit Sub
End Sub
Sub de_magicsq(n As UInteger, filename As String = "")
' filename <> "" then save square in a file ' filename can contain directory name ' if filename exist it will be overwriten, no error checking
If n < 4 Then
Err_msg( "Error: n is to small")
Exit Sub
End If
If (n Mod 4) <> 0 Then
Err_msg "Error: not possible to make doubly" + _
" even magic square size " + Str(n)
Exit Sub
End If
Dim As UInteger sq(1 To n, 1 To n) Dim As UInteger magic_sum = n * (n ^ 2 +1) \ 2 Dim As UInteger q = n \ 4 Dim As UInteger x, y, nr = 1 Dim As String frmt = String(Len(Str(n * n)) +1, "#")
' set up the square
For y = 1 To n
For x = q +1 To n - q
sq(x,y) = 1
Next
Next
For x = 1 To n
For y = q +1 To n - q
sq(x, y) Xor= 1
Next
Next
' fill the square
q = n * n +1
For y = 1 To n
For x = 1 To n
If sq(x,y) = 0 Then
sq(x,y) = q - nr
Else
sq(x,y) = nr
End If
nr += 1
Next
Next
' check columms and rows
For y = 1 To n
nr = 0 : q = 0
For x = 1 To n
nr += sq(x,y)
q += sq(y,x)
Next
If nr <> magic_sum Or q <> magic_sum Then
Err_msg "Error: value <> magic_sum"
Exit Sub
End If
Next
' check diagonals
nr = 0 : q = 0
For x = 1 To n
nr += sq(x, x)
q += sq(n - x +1, n - x +1)
Next
If nr <> magic_sum Or q <> magic_sum Then
Err_msg "Error: value <> magic_sum"
Exit Sub
End If
' printing square's on screen bigger when
' n > 19 results in a wrapping of the line
Print "Single even magic square size: "; n; "*"; n
Print "The magic sum = "; magic_sum
Print
For y = 1 To n
For x = 1 To n
Print Using frmt; sq(x, y);
Next
Print
Next
' output magic square to a file with the name provided
If filename <> "" Then
nr = FreeFile
Open filename For Output As #nr
Print #nr, "Single even magic square size: "; n; "*"; n
Print #nr, "The magic sum = "; magic_sum
Print #nr,
For y = 1 To n
For x = 1 To n
Print #nr, Using frmt; sq(x,y);
Next
Print #nr,
Next
Close #nr
End If
End Sub
' ------=< MAIN >=------
de_magicsq(8, "magic8de.txt") : Print
' empty keyboard buffer While Inkey <> "" : Wend Print : Print "hit any key to end program" Sleep End</lang>
- Output:
Single even magic square size: 8*8 The magic sum = 260 64 63 3 4 5 6 58 57 56 55 11 12 13 14 50 49 17 18 46 45 44 43 23 24 25 26 38 37 36 35 31 32 33 34 30 29 28 27 39 40 41 42 22 21 20 19 47 48 16 15 51 52 53 54 10 9 8 7 59 60 61 62 2 1
Go
<lang Go>package main
import ( "fmt" "log" "strings" )
const dimensions int = 8
func setupMagicSquareData(d int) ([][]int, error) { var output [][]int if d < 4 || d%4 != 0 { return [][]int{}, fmt.Errorf("Square dimension must be a positive number which is divisible by 4") } var bits uint = 0x9669 // 0b1001011001101001 size := d * d mult := d / 4 for i, r := 0, 0; r < d; r++ { output = append(output, []int{}) for c := 0; c < d; i, c = i+1, c+1 { bitPos := c/mult + (r/mult)*4 if (bits & (1 << uint(bitPos))) != 0 { output[r] = append(output[r], i+1) } else { output[r] = append(output[r], size-i) } } } return output, nil }
func arrayItoa(input []int) []string { var output []string for _, i := range input { output = append(output, fmt.Sprintf("%4d", i)) } return output }
func main() { data, err := setupMagicSquareData(dimensions) if err != nil { log.Fatal(err) } magicConstant := (dimensions * (dimensions*dimensions + 1)) / 2 for _, row := range data { fmt.Println(strings.Join(arrayItoa(row), " ")) } fmt.Printf("\nMagic Constant: %d\n", magicConstant) } </lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic Constant: 260
Haskell
<lang Haskell>import Data.List (transpose, unfoldr, intercalate) import Data.List.Split (chunksOf) import Control.Monad (forM_)
magicSquare :: Int -> Int magicSquare n
| rem n 4 > 0 = []
| otherwise =
chunksOf n $
zipWith
(\x i ->
if x
then i
else limit - i)
series
[1 .. sqr]
where
sqr = n * n
limit = sqr + 1
series
| isPowerOf 2 n = magicSeries $ floor (logBase 2 (fromIntegral sqr))
| otherwise =
concat . concat . concat . scale $ scale <$> chunksOf 4 (magicSeries 4)
where
scale = replicate $ quot n 4
magicSeries :: Int -> [Bool] magicSeries = (iterate ((++) <*> fmap not) [True] !!)
isPowerOf :: Int -> Int -> Bool isPowerOf k n = until ((0 /=) . flip rem k) (`quot` k) n == 1
-- TEST AND DISPLAY FUNCTIONS --------------------------------------------------
checked :: Int -> (Int, Bool) checked square =
let diagonals =
fmap (flip (zipWith (!!)) [0 ..]) . ((:) <*> (return . reverse))
h:t =
sum <$>
square ++ -- rows
transpose square ++ -- cols
diagonals square -- diagonals
in (h, all (h ==) t)
table :: String -> String -> [String] table delim rows =
let justifyRight c n s = drop (length s) (replicate n c ++ s)
in intercalate delim <$>
transpose
((fmap =<< justifyRight ' ' . maximum . fmap length) <$> transpose rows)
main :: IO () main =
forM_ [4, 8, 16] $ \n -> do let test = magicSquare n putStrLn $ unlines (table " " (fmap show <$> test)) print $ checked test putStrLn ""</lang>
- Output:
main 1 15 14 4 12 6 7 9 8 10 11 5 13 3 2 16 (34,True) 1 63 62 4 60 6 7 57 56 10 11 53 13 51 50 16 48 18 19 45 21 43 42 24 25 39 38 28 36 30 31 33 32 34 35 29 37 27 26 40 41 23 22 44 20 46 47 17 49 15 14 52 12 54 55 9 8 58 59 5 61 3 2 64 (260,True) 1 255 254 4 252 6 7 249 248 10 11 245 13 243 242 16 240 18 19 237 21 235 234 24 25 231 230 28 228 30 31 225 224 34 35 221 37 219 218 40 41 215 214 44 212 46 47 209 49 207 206 52 204 54 55 201 200 58 59 197 61 195 194 64 192 66 67 189 69 187 186 72 73 183 182 76 180 78 79 177 81 175 174 84 172 86 87 169 168 90 91 165 93 163 162 96 97 159 158 100 156 102 103 153 152 106 107 149 109 147 146 112 144 114 115 141 117 139 138 120 121 135 134 124 132 126 127 129 128 130 131 125 133 123 122 136 137 119 118 140 116 142 143 113 145 111 110 148 108 150 151 105 104 154 155 101 157 99 98 160 161 95 94 164 92 166 167 89 88 170 171 85 173 83 82 176 80 178 179 77 181 75 74 184 185 71 70 188 68 190 191 65 193 63 62 196 60 198 199 57 56 202 203 53 205 51 50 208 48 210 211 45 213 43 42 216 217 39 38 220 36 222 223 33 32 226 227 29 229 27 26 232 233 23 22 236 20 238 239 17 241 15 14 244 12 246 247 9 8 250 251 5 253 3 2 256 (2056,True)
J
<lang J> mask =: ,#: 8 $ 153 102 102 153 t =: (, 65&-) each >:i.64 8 8 $ mask{each t </lang>
- Output:
┌──┬──┬──┬──┬──┬──┬──┬──┐ │64│2 │3 │61│60│6 │7 │57│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │9 │55│54│12│13│51│50│16│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │17│47│46│20│21│43│42│24│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │40│26│27│37│36│30│31│33│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │32│34│35│29│28│38│39│25│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │41│23│22│44│45│19│18│48│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │49│15│14│52│53│11│10│56│ ├──┼──┼──┼──┼──┼──┼──┼──┤ │8 │58│59│5 │4 │62│63│1 │ └──┴──┴──┴──┴──┴──┴──┴──┘
Java
<lang java>public class MagicSquareDoublyEven {
public static void main(String[] args) {
int n = 8;
for (int[] row : magicSquareDoublyEven(n)) {
for (int x : row)
System.out.printf("%2s ", x);
System.out.println();
}
System.out.printf("\nMagic constant: %d ", (n * n + 1) * n / 2);
}
static int[][] magicSquareDoublyEven(final int n) {
if (n < 4 || n % 4 != 0)
throw new IllegalArgumentException("base must be a positive "
+ "multiple of 4");
// pattern of count-up vs count-down zones
int bits = 0b1001_0110_0110_1001;
int size = n * n;
int mult = n / 4; // how many multiples of 4
int[][] result = new int[n][n];
for (int r = 0, i = 0; r < n; r++) {
for (int c = 0; c < n; c++, i++) {
int bitPos = c / mult + (r / mult) * 4;
result[r][c] = (bits & (1 << bitPos)) != 0 ? i + 1 : size - i;
}
}
return result;
}
}</lang>
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant: 260
JavaScript
ES6
<lang JavaScript>(() => {
'use strict';
// doubleEvenMagicSquare :: Int -> Int const doubleEvenMagicSquare = n => { if (n % 4 > 0) return undefined;
// truthSeries :: Int -> [Int]
const truthSeries = n => {
if (n <= 0) return [true];
const xs = truthSeries(n - 1);
return xs.concat(xs.map(x => !x));
};
const sqr = n * n,
scale = curry(replicate)(n / 4),
power = Math.log2(sqr),
sequence = isInt(power) ? truthSeries(power) : (
flatten(
scale(
splitEvery(4, truthSeries(4))
.map(scale)
)
)
);
return splitEvery(n, sequence
.map((x, i) => x ? i + 1 : sqr - i));
};
// GENERIC FUNCTIONS ----------------------------------------------------
// flatten :: Tree a -> [a] const flatten = t => (t instanceof Array ? concatMap(flatten, t) : [t]);
// concatMap :: (a -> [b]) -> [a] -> [b] const concatMap = (f, xs) => [].concat.apply([], xs.map(f));
// splitEvery :: Int -> [a] -> [][a]]
const splitEvery = (n, xs) => {
if (xs.length <= n) return [xs];
const [h, t] = [xs.slice(0, n), xs.slice(n)];
return [h].concat(splitEvery(n, t));
}
// curry :: ((a, b) -> c) -> a -> b -> c const curry = f => a => b => f(a, b);
// replicate :: Int -> a -> [a]
const replicate = (n, a) => {
let v = [a],
o = [];
if (n < 1) return o;
while (n > 1) {
if (n & 1) o = o.concat(v);
n >>= 1;
v = v.concat(v);
}
return o.concat(v);
};
// isInt :: Int -> Bool const isInt = x => x === Math.floor(x);
// TEST AND DISPLAY FUNCTIONS -------------------------------------------
// transpose :: a -> a const transpose = xs => xs[0].map((_, iCol) => xs.map((row) => row[iCol]));
// diagonals :: a -> ([a], [a]) const diagonals = xs => { const nRows = xs.length, nCols = (nRows > 0 ? xs[0].length : 0); const cell = (x, y) => xs[y][x];
if (nRows === nCols) {
const ns = range(0, nCols - 1);
return [zipWith(cell, ns, ns), zipWith(cell, ns, reverse(ns))];
} else return [
[],
[]
];
};
// zipWith :: (a -> b -> c) -> [a] -> [b] -> [c]
const zipWith = (f, xs, ys) => {
const ny = ys.length;
return (xs.length <= ny ? xs : xs.slice(0, ny))
.map((x, i) => f(x, ys[i]));
}
// reverse :: [a] -> [a]
const reverse = (xs) => xs.slice(0)
.reverse()
// range :: Int -> Int -> [Int]
const range = (m, n) =>
Array.from({
length: Math.floor(n - m) + 1
}, (_, i) => m + i);
// all :: (a -> Bool) -> [a] -> Bool const all = (f, xs) => xs.every(f);
// show :: a -> String const show = x => JSON.stringify(x);
// justifyRight :: Int -> Char -> Text -> Text
const justifyRight = (n, cFiller, strText) =>
n > strText.length ? (
(cFiller.repeat(n) + strText)
.slice(-n)
) : strText;
// TEST -----------------------------------------------------------------
//return doubleEvenMagicSquare(8)
return [4, 8, 12]
.map(n => {
const lines = doubleEvenMagicSquare(n);
const sums = lines.concat(
transpose(lines)
.concat(diagonals(lines))
)
.map(xs => xs.reduce((a, b) => a + b, 0));
const sum = sums[0];
return [
"Order: " + n.toString(),
"Summing to: " + sum.toString(),
"Row, column and diagonal sums checked: " +
all(x => x === sum, sums)
.toString() + '\n',
lines.map(
xs => xs.map(
x => justifyRight(3, ' ', x.toString())
)
.join(' '))
.join('\n')
].join('\n')
})
.join('\n\n');
})();</lang>
- Output:
Order: 4 Summing to: 34 Row, column and diagonal sums checked: true 1 15 14 4 12 6 7 9 8 10 11 5 13 3 2 16 Order: 8 Summing to: 260 Row, column and diagonal sums checked: true 1 63 62 4 60 6 7 57 56 10 11 53 13 51 50 16 48 18 19 45 21 43 42 24 25 39 38 28 36 30 31 33 32 34 35 29 37 27 26 40 41 23 22 44 20 46 47 17 49 15 14 52 12 54 55 9 8 58 59 5 61 3 2 64 Order: 12 Summing to: 870 Row, column and diagonal sums checked: true 1 143 142 4 5 139 138 8 9 135 134 12 132 14 15 129 128 18 19 125 124 22 23 121 120 26 27 117 116 30 31 113 112 34 35 109 37 107 106 40 41 103 102 44 45 99 98 48 49 95 94 52 53 91 90 56 57 87 86 60 84 62 63 81 80 66 67 77 76 70 71 73 72 74 75 69 68 78 79 65 64 82 83 61 85 59 58 88 89 55 54 92 93 51 50 96 97 47 46 100 101 43 42 104 105 39 38 108 36 110 111 33 32 114 115 29 28 118 119 25 24 122 123 21 20 126 127 17 16 130 131 13 133 11 10 136 137 7 6 140 141 3 2 144
Julia
<lang julia># v0.6
function magicsquaredoubleeven(order::Int)
if order % 4 != 0; error("the order must be divisible by 4") end
sqr = Matrix{Int}(order, order)
mul = div(order, 4)
ext = vcat(1:mul, order-mul+1:order)
isext(i::Int, j::Int) = (i in ext) == (j in ext)
boolsqr = collect(isext(i, j) for i in 1:order, j in 1:order)
for i in linearindices(sqr)
if boolsqr[i]; sqr[i] = i end
if !boolsqr[end+1-i]; sqr[end+1-i] = i end
end
return sqr
end
for n in (4, 8, 12)
magicconst = div(n ^ 3 + n, 2) sq = magicsquaredoubleeven(n)
println("Order: $n; magic constant: $magicconst.\nSquare:")
for r in 1:n, c in 1:n
@printf("%4i", sq[r, c])
if c == n; println() end
end
println()
end</lang>
- Output:
Order: 4; magic constant: 34. Square: 1 12 8 13 15 6 10 3 14 7 11 2 4 9 5 16 Order: 8; magic constant: 260. Square: 1 9 48 40 32 24 49 57 2 10 47 39 31 23 50 58 62 54 19 27 35 43 14 6 61 53 20 28 36 44 13 5 60 52 21 29 37 45 12 4 59 51 22 30 38 46 11 3 7 15 42 34 26 18 55 63 8 16 41 33 25 17 56 64 Order: 12; magic constant: 870. Square: 1 13 25 108 96 84 72 60 48 109 121 133 2 14 26 107 95 83 71 59 47 110 122 134 3 15 27 106 94 82 70 58 46 111 123 135 141 129 117 40 52 64 76 88 100 33 21 9 140 128 116 41 53 65 77 89 101 32 20 8 139 127 115 42 54 66 78 90 102 31 19 7 138 126 114 43 55 67 79 91 103 30 18 6 137 125 113 44 56 68 80 92 104 29 17 5 136 124 112 45 57 69 81 93 105 28 16 4 10 22 34 99 87 75 63 51 39 118 130 142 11 23 35 98 86 74 62 50 38 119 131 143 12 24 36 97 85 73 61 49 37 120 132 144
Kotlin
<lang scala>// version 1.1.0
fun magicSquareDoublyEven(n: Int): Array<IntArray> {
if ( n < 4 || n % 4 != 0)
throw IllegalArgumentException("Base must be a positive multiple of 4")
// pattern of count-up vs count-down zones
val bits = 0b1001_0110_0110_1001
val size = n * n
val mult = n / 4 // how many multiples of 4
val result = Array(n) { IntArray(n) }
var i = 0
for (r in 0 until n)
for (c in 0 until n) {
val bitPos = c / mult + r / mult * 4
result[r][c] = if (bits and (1 shl bitPos) != 0) i + 1 else size - i
i++
}
return result
}
fun main(args: Array<String>) {
val n = 8
for (ia in magicSquareDoublyEven(n)) {
for (i in ia) print("%2d ".format(i))
println()
}
println("\nMagic constant ${(n * n + 1) * n / 2}")
}</lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant 260
Lua
For all three kinds of Magic Squares(Odd, singly and doubly even)
See Magic_squares/Lua.
PARI/GP
A magic one-liner: <lang parigp>magicsquare(n)=matrix(n,n,i,j,k=i+j*n-n;if(bitand(38505,2^((j-1)%4*4+(i-1)%4)),k,n*n+1-k))</lang>
Output:
magicsquare(8) [ 1 56 48 25 33 24 16 57] [63 10 18 39 31 42 50 7] [62 11 19 38 30 43 51 6] [ 4 53 45 28 36 21 13 60] [ 5 52 44 29 37 20 12 61] [59 14 22 35 27 46 54 3] [58 15 23 34 26 47 55 2] [ 8 49 41 32 40 17 9 64]
BTW: The bit field number 38505 = 9669h seems to come from hell to do the magic...
Perl 6
See Magic squares/Perl 6 for a general magic square generator.
- Output:
With a parameter of 8:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 The magic number is 260
With a parameter of 12:
1 2 3 141 140 139 138 137 136 10 11 12 13 14 15 129 128 127 126 125 124 22 23 24 25 26 27 117 116 115 114 113 112 34 35 36 108 107 106 40 41 42 43 44 45 99 98 97 96 95 94 52 53 54 55 56 57 87 86 85 84 83 82 64 65 66 67 68 69 75 74 73 72 71 70 76 77 78 79 80 81 63 62 61 60 59 58 88 89 90 91 92 93 51 50 49 48 47 46 100 101 102 103 104 105 39 38 37 109 110 111 33 32 31 30 29 28 118 119 120 121 122 123 21 20 19 18 17 16 130 131 132 133 134 135 9 8 7 6 5 4 142 143 144 The magic number is 870
Phix
<lang Phix>constant t = {{1,1,0,0},
{1,1,0,0},
{0,0,1,1},
{0,0,1,1}}
function magic_square(integer n)
if n<4 or mod(n,4)!=0 then return false end if
sequence square = repeat(repeat(0,n),n)
integer i = 0
for r=1 to n do
for c=1 to n do
square[r,c] = iff(t[mod(r,4)+1,mod(c,4)+1]?i+1:n*n-i)
i += 1
end for
end for
return square
end function
procedure check(sequence sq)
integer n = length(sq)
integer magic = n*(n*n+1)/2
integer bd = 0, fd = 0
for i=1 to length(sq) do
if sum(sq[i])!=magic then ?9/0 end if
if sum(columnize(sq,i))!=magic then ?9/0 end if
bd += sq[i,i]
fd += sq[n-i+1,n-i+1]
end for
if bd!=magic or fd!=magic then ?9/0 end if
end procedure
--for i=4 to 16 by 4 do for i=8 to 8 by 4 do
sequence square = magic_square(i)
printf(1,"maqic square of order %d, sum: %d\n", {i,sum(square[i])})
string fmt = sprintf("%%%dd",length(sprintf("%d",i*i)))
pp(square,{pp_Nest,1,pp_IntFmt,fmt,pp_StrFmt,1,pp_Pause,0})
check(square)
end for</lang>
- Output:
maqic square of order 8, sum: 260
{{ 1,63,62, 4, 5,59,58, 8},
{56,10,11,53,52,14,15,49},
{48,18,19,45,44,22,23,41},
{25,39,38,28,29,35,34,32},
{33,31,30,36,37,27,26,40},
{24,42,43,21,20,46,47,17},
{16,50,51,13,12,54,55, 9},
{57, 7, 6,60,61, 3, 2,64}}
PureBasic
<lang PureBasic>Procedure.i MagicN(n.i)
ProcedureReturn n*(n*n+1)/2
EndProcedure
Procedure.i MaxN(mx.i,n.i)
If mx>n : ProcedureReturn mx : Else : ProcedureReturn n : EndIf
EndProcedure
Procedure.i MaxL(mx.i)
Define.i i While mx mx/10 : i+1 Wend ProcedureReturn i
EndProcedure
Procedure.b DblEvenMagicSquare(n.i)
Define.i q=n/4, nr=1, x, y, max, spc
Dim sq.i(n,n)
For y=1 To n
For x=q+1 To n-q
sq(x,y)=1
Next
Next
For x=1 To n
For y=q+1 To n-q
sq(x,y) ! 1
Next
Next
q=n*n+1
For y=1 To n
For x=1 To n
If sq(x,y)=0
sq(x,y)=q-nr
Else
sq(x,y)=nr
EndIf
nr+1
max=MaxN(max,sq(x,y))
Next
Next
spc=MaxL(max)+1
For y=n To 1 Step -1
For x=n To 1 Step -1
Print(RSet(Str(sq(x,y)),spc," "))
Next
PrintN("")
Next
EndProcedure
OpenConsole("Magic-Square-Doubly-Even") Define.i n
Repeat
PrintN("Input [4,8,12..n] (0=Exit)")
While (n<4) Or (n%4)
Print(">") : n=Val(Input())
If n=0 : End : EndIf
Wend
PrintN("The magic sum = "+Str(MagicN(n)))
DblEvenMagicSquare(n)
n=0
ForEver</lang>
- Output:
Input [4,8,12..n] (0=Exit)>8 The magic sum = 260
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64Input [4,8,12..n] (0=Exit)
>
Python
<lang python> def MagicSquareDoublyEven(order):
sq = [range(1+n*order,order + (n*order)+1) for n in range(order) ]
n1 = order/4
for r in range(n1):
r1 = sq[r][n1:-n1]
r2 = sq[order -r - 1][n1:-n1]
r1.reverse()
r2.reverse()
sq[r][n1:-n1] = r2
sq[order -r - 1][n1:-n1] = r1
for r in range(n1, order-n1):
r1 = sq[r][:n1]
r2 = sq[order -r - 1][order-n1:]
r1.reverse()
r2.reverse()
sq[r][:n1] = r2
sq[order -r - 1][order-n1:] = r1
return sq
def printsq(s):
n = len(s)
bl = len(str(n**2))+1
for i in range(n):
print .join( [ ("%"+str(bl)+"s")%(str(x)) for x in s[i]] )
print "\nMagic constant = %d"%sum(s[0])
printsq(MagicSquareDoublyEven(8)) </lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64Magic constant = 260 >>>
REXX
"Marked" numbers (via the diag subroutine) indicate that those (sequentially generated) numbers don't get
swapped (and thusly, stay in place in the magic square).
<lang rexx>/*REXX program constructs a magic square of doubly even sides (a size divisible by 4).*/
n=8; s=n%4; L=n%2-s+1; w=length(n**2) /*size; small sq; low middle; # width*/
@.=0; H=n%2+s /*array default; high middle. */
call gen /*generate a grid in numerical order. */
call diag /*mark numbers on both diagonals. */
call corn /* " " in small corner boxen. */
call midd /* " " in the middle " */
call swap /*swap positive numbers with highest #.*/
call show /*display the doubly even magic square.*/
call sum /* " " magic number for square. */
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
o: parse arg ?; return n-?+1 /*calculate the "other" (right) column.*/
@: parse arg x,y; return abs(@.x.y)
diag: do r=1 for n; @.r.r=-@(r,r); o=o(r); @.r.o=-@(r,o); end; return
midd: do r=L to H; do c=L to H; @.r.c=-@(r,c); end; end; return
gen: #=0; do r=1 for n; do c=1 for n; #=#+1; @.r.c=#; end; end; return
show: #=0; do r=1 for n; $=; do c=1 for n; $=$ right(@(r,c),w); end; say $; end; return
sum: #=0; do r=1 for n; #=#+@(r,1); end; say; say 'The magic number is: ' #; return
max#: do a=n for n by -1; do b=n for n by -1; if @.a.b>0 then return; end; end
/*──────────────────────────────────────────────────────────────────────────────────────*/
swap: do r=1 for n
do c=1 for n; if @.r.c<0 then iterate; call max# /*find max number.*/
parse value -@.a.b (-@.r.c) with @.r.c @.a.b /*swap two values.*/
end /*c*/
end /*r*/
return
/*──────────────────────────────────────────────────────────────────────────────────────*/ corn: do r=1 for n; if r>s & r<=n-s then iterate /*"corner boxen", size≡S*/
do c=1 for n; if c>s & c<=n-s then iterate; @.r.c=-@(r,c); end /*c*/
end /*r*/
return</lang>
output when using the default input:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 The magic number is: 260
Ruby
<lang ruby>def double_even_magic_square(n)
raise ArgumentError, "Need multiple of four" if n%4 > 0
block_size, max = n/4, n*n
pre_pat = [true, false, false, true,
false, true, true, false]
pre_pat += pre_pat.reverse
pattern = pre_pat.flat_map{|b| [b] * block_size} * block_size
flat_ar = pattern.each_with_index.map{|yes, num| yes ? num+1 : max-num}
flat_ar.each_slice(n).to_a
end
def to_string(square)
n = square.size
fmt = "%#{(n*n).to_s.size + 1}d" * n
square.inject(""){|str,row| str << fmt % row << "\n"}
end
puts to_string(double_even_magic_square(8))</lang>
- Output:
1 2 62 61 60 59 7 8 56 55 11 12 13 14 50 49 48 47 19 20 21 22 42 41 25 26 38 37 36 35 31 32 33 34 30 29 28 27 39 40 24 23 43 44 45 46 18 17 16 15 51 52 53 54 10 9 57 58 6 5 4 3 63 64
Scala
- Output:
Best seen running in your browser either by ScalaFiddle (ES aka JavaScript, non JVM) or Scastie (remote JVM).
<lang Scala>object MagicSquareDoublyEven extends App {
private val n = 8
private def magicSquareDoublyEven(n: Int): Array[Array[Int]] = {
require(n >= 4 || n % 4 == 0, "Base must be a positive multiple of 4.")
// pattern of count-up vs count-down zones val (bits, mult, result, size) = (38505, n / 4, Array.ofDim[Int](n, n), n * n) var i = 0
for (r <- result.indices; c <- result(0).indices) {
def bitPos = c / mult + (r / mult) * 4
result(r)(c) = if ((bits & (1 << bitPos)) != 0) i + 1 else size - i
i += 1
}
result
}
magicSquareDoublyEven(n).foreach(row => println(row.map(x => f"$x%2s ").mkString))
println(f"---%nMagic constant: ${(n * n + 1) * n / 2}%d")
}</lang>
Sidef
<lang ruby>func double_even_magic_square(n) {
assert(n%4 == 0, "Need multiple of four")
var (bsize, max) = (n/4, n*n)
var pre_pat = [true, false, false, true,
false, true, true, false]
pre_pat += pre_pat.flip
var pattern = (pre_pat.map{|b| bsize.of(b)... } * bsize)
pattern.map_kv{|k,v| v ? k+1 : max-k }.slices(n)
}
func format_matrix(a) {
var fmt = "%#{a.len**2 -> len}s"
a.map { .map { fmt % _ }.join(' ') }.join("\n")
}
say format_matrix(double_even_magic_square(8))</lang>
- Output:
1 2 62 61 60 59 7 8 56 55 11 12 13 14 50 49 48 47 19 20 21 22 42 41 25 26 38 37 36 35 31 32 33 34 30 29 28 27 39 40 24 23 43 44 45 46 18 17 16 15 51 52 53 54 10 9 57 58 6 5 4 3 63 64
VBScript
<lang vb>' Magic squares of doubly even order n=8 'multiple of 4 pattern="1001011001101001" size=n*n: w=len(size) mult=n\4 'how many multiples of 4 wscript.echo "Magic square : " & n & " x " & n i=0 For r=0 To n-1 l="" For c=0 To n-1 bit=Mid(pattern, c\mult+(r\mult)*4+1, 1) If bit="1" Then t=i+1 Else t=size-i l=l & Right(Space(w) & t, w) & " " i=i+1 Next 'c wscript.echo l Next 'r wscript.echo "Magic constant=" & (n*n+1)*n/2</lang>
- Output:
Magic square : 8 x 8 1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant=260
Visual Basic .NET
<lang vbnet>Module MagicSquares
Function MagicSquareDoublyEven(n As Integer) As Integer(,)
If n < 4 OrElse n Mod 4 <> 0 Then
Throw New ArgumentException("base must be a positive multiple of 4")
End If
'pattern of count-up vs count-down zones
Dim bits = Convert.ToInt32("1001011001101001", 2)
Dim size = n * n
Dim mult As Integer = n / 4 ' how many multiples of 4
Dim result(n - 1, n - 1) As Integer
Dim i = 0
For r = 0 To n - 1
For c = 0 To n - 1
Dim bitPos As Integer = Math.Floor(c / mult) + Math.Floor(r / mult) * 4
Dim test = (bits And (1 << bitPos)) <> 0
If test Then
result(r, c) = i + 1
Else
result(r, c) = size - i
End If
i = i + 1
Next
Console.WriteLine()
Next
Return result End Function
Sub Main()
Dim n = 8
Dim result = MagicSquareDoublyEven(n)
For i = 0 To result.GetLength(0) - 1
For j = 0 To result.GetLength(1) - 1
Console.Write("{0,2} ", result(i, j))
Next
Console.WriteLine()
Next
Console.WriteLine()
Console.WriteLine("Magic constant: {0} ", (n * n + 1) * n / 2)
Console.ReadLine() End Sub
End Module</lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant: 260
zkl
<lang zkl>class MagicSquareDoublyEven{
fcn init(n){ var result=magicSquareDoublyEven(n) }
fcn toString{
sink,n:=Sink(String),result.len(); // num collumns
fmt:="%2s ";
foreach row in (result)
{ sink.write(row.apply('wrap(n){ fmt.fmt(n) }).concat(),"\n") }
sink.write("\nMagic constant: %d".fmt((n*n + 1)*n/2));
sink.close();
}
fcn magicSquareDoublyEven(n){
if (n<4 or n%4!=0 or n>16)
throw(Exception.ValueError("base must be a positive multiple of 4"));
bits,size,mult:=0b1001011001101001, n*n, n/4;
result:=n.pump(List(),n.pump(List(),0).copy); // array[n,n] of zero
foreach i in (size){
bitsPos:=(i%n)/mult + (i/(n*mult)*4); value:=(bits.bitAnd((2).pow(bitsPos))) and i+1 or size-i; result[i/n][i%n]=value;
}
result;
}
} MagicSquareDoublyEven(8).println();</lang>
- Output:
1 2 62 61 60 59 7 8 9 10 54 53 52 51 15 16 48 47 19 20 21 22 42 41 40 39 27 28 29 30 34 33 32 31 35 36 37 38 26 25 24 23 43 44 45 46 18 17 49 50 14 13 12 11 55 56 57 58 6 5 4 3 63 64 Magic constant: 260