Loops/Nested: Difference between revisions

 

=={{header|11l}}==

L 10

mat [+]= (1..10).map(x -> random:(1..20))

print(el, end' ‘ ’)

I el == 20

 

=={{header|360 Assembly}}==

LOOPNEST CSECT

USING LOOPNEST,R12

RANDSEED DC F'16807' running n

YREGS

{{out}}

<pre> 3 4 1 11 13 17 11 9 8 2 15 19 16 18 1 9 7 16 12 3

 

=={{header|Action!}}==

DEFINE PTR="CARD"

BYTE i,j,found

PutE()

OD

{{out}}

[https://gitlab.com/amarok8bit/action-rosetta-code/-/raw/master/images/Loops_nested.png Screenshot from Atari 8-bit computer]

 

=={{header|Ada}}==

with Ada.Numerics.Discrete_Random;

 

New_Line;

end loop Outer;

{{out|Sample output}}

<pre>

=={{header|ALGOL 60}}==

{{works with|ALGOL 60|OS/360}}

'INTEGER' SEED;

'INTEGER' 'PROCEDURE' RANDOM(N);

'END';

LAB:

{{out}}

<pre>

{{works with|ALGOL 68G|Any - tested with release [http://sourceforge.net/projects/algol68/files/algol68g/algol68g-1.18.0/algol68g-1.18.0-9h.tiny.el5.centos.fc11.i386.rpm/download 1.18.0-9h.tiny]}}

{{works with|ELLA ALGOL 68|Any (with appropriate job cards)}}

[10][10]INT a; INT i, j;

 

xkcd com 292:

print(new line)

{{out|Sample output}}

<pre>

=={{header|AppleScript}}==

AppleScript has <tt>exit repeat</tt> to break out of a single loop prematurely, but nothing specifically for nested loops. So either <tt>exit repeat</tt> must be used twice …

set out to {}

repeat with i from 1 to (count array)

return out

… or of course one or both loops can be specified to terminate at the critical juncture anyway …

set out to {}

repeat with i from 1 to (count array)

return out

… or, with the process in a dedicated handler, it can be returned from directly at any point:

set out to {}

repeat with i from 1 to (count array)

return out

 

Demo:

set array to {}

set stopVal to 20

set end of array to row

end repeat

 

{{output}}

 

=={{header|ARM Assembly}}==

{{works with|as|Raspberry Pi}}

/* ARM assembly Raspberry PI */

/* program loopnested.s */

pop {r4, lr}

bx lr

 

=={{header|AutoHotkey}}==

{

i := A_Index

finish:

MsgBox % "a[" . i . "][" . j . "]" is 20

 

=={{header|AWK}}==

To break from two loops, this program uses two <tt>break</tt> statements and one <tt>b</tt> flag.

rows = 5

columns = 5

print

}

 

=={{header|BASIC}}==

{{works with|QuickBasic|4.5}}

CLS

FOR row = 1 TO 10

IF a(row, col) = 20 THEN END

NEXT col

 

==={{header|Applesoft BASIC}}===

2 R = 4

3 C = C - 1:R = C - 1: DIM A(C,R)

7 FOR I = 0 TO C

8 PRINT S$A(I,J);:S$ = " "

==={{header|Commodore BASIC}}===

We should END gracefully. (The Sinclair example below will produce an error on any Commodore machine.)

Also... What if no 20 is ever found?

 

10 dim a$(20,20):print "initializing...":print

20 for r=1 to 20:for c=1 to 20

100 next c,r

110 print "search complete. no 20 found.":end

 

==={{header|Sinclair ZX81 BASIC}}===

A couple of points to note: (1) since the values we want are small enough to fit into an unsigned byte, we cast them to characters and store them in an array of strings—thereby using only a fifth of the storage space that an array of numbers would take up; (2) the <code>GOTO</code> statement in line <tt>100</tt> breaks out of both the enclosing loops and also, since its target is higher than any line number in the program, causes execution to terminate normally.

 

20 FOR I=1 TO 20

30 FOR J=1 TO 20

100 IF CODE A$(I,J)=20 THEN GOTO 130

110 NEXT J

 

 

=={{header|BASIC256}}==

 

for i = 0 to 19

next i

 

 

 

=={{header|BBC BASIC}}==

{{works with|BBC BASIC for Windows}}

FOR row% = 0 TO 10

FOR col% = 0 TO 10

NEXT

NEXT row%

EXIT FOR can jump out of multiple nested loops by specifying a control variable.

 

Arrays have only one dimension, so we use ''a[i * c + j]'' instead of ''a[i, j]''.

{{trans|AWK}}

 

/* Random number from 1 to 20. */

"

}

 

=={{header|C}}==

Using goto (note: gotos are [http://en.wikipedia.org/wiki/Considered_harmful considered harmful]):

#include <time.h>

#include <stdio.h>

printf("\n");

return 0;

 

Using break, the preferred alternative to goto

#include <stdlib.h>

#include <time.h>

return 0;

}

 

=={{header|C sharp|C#}}==

Uses goto as C# has no way to break from multiple loops

 

class Program {

Console.WriteLine();

}

 

 

Same using Linq :

using System.Collections.Generic;

using System.Linq;

Console.WriteLine();

}

 

=={{header|C++}}==

Lambda call:

{{works with|C++11}}

#include<ctime>

#include<iostream>

})();

return 0;

Goto statement:

{{works with|C++11}}

#include<ctime>

#include<iostream>

 

return 0;

 

=={{header|Chapel}}==

 

var nums:[1..10, 1..10] int;

}

writeln();

 

=={{header|Clojure}}==

We explicitly return a status flag from the inner loop:

 

(defn create-matrix [width height]

(when rs (recur rs)))))

 

 

=={{header|COBOL}}==

PROGRAM-ID. Nested-Loop.

 

 

GOBACK

 

=={{header|ColdFusion}}==

<Cfset RandNum = 0>

<Cfloop condition="randNum neq 20">

<br>

</Cfloop>

 

=={{header|Common Lisp}}==

(dotimes (i 10)

(dotimes (j 10)

(return-from outer)))

(terpri))

 

=={{header|D}}==

 

void main() {

 

writeln();

 

=={{header|dc}}==

A single ''Q'' command can break multiple nested loops.

{{trans|bc}}

 

[*

]sL

0 d si [i = 0]sz

In this program, ''li lj + 3 + Q'' breaks both the inner loop and the outer loop. We must count how many levels of string execution to break. Our loops use tail recursion, so each iteration is a level of string execution. We have i + 1 calls to outer loop L, and j + 1 calls to inner loop I, and 1 call to condition D; so we break i + j + 3 levels with ''li lj + 3 + Q''.

 

=={{header|Delphi}}/{{header|Pascal}}==

matrix: array[1..10,1..10] of Integer;

row, col: Integer;

if Broken then break;

end;

 

=={{header|Dyalect}}==

There is no direct way to break out of a nested loop in Dyalect, <code>goto</code> is also not supported, however the desired effect can be achieved by placing a nested loop in an expression context and make it return <code>true</code> if we need to break out of the parent loop:

 

for row in array {

}

}

 

{{out}}

 

=={{header|E}}==

 

escape done {

}

}

 

=={{header|EchoLisp}}==

(lib 'math) ;; for 2D-arrays

(define array (build-array 42 42 (lambda(i j) (1+ (random 20)))))

→ 9 8 11 1 14 11 1 9 16 1 10 5 5 6 5 4 13 17 14 13 6 10 16 4 8 5 1 17 16 19 4 6 18 1 15 3 4 13 19

6 12 5 5 17 19 16 3 7 2 15 16 14 16 16 19 18 14 16 6 18 14 17 20

 

=={{header|Elixir}}==

{{works with|Elixir|1.2}}

def nested do

list = Enum.shuffle(1..20) |> Enum.chunk(5)

end

 

 

{{out|Sample output}}

 

'''used Enum.any?'''

IO.inspect list, char_lists: :as_lists

Enum.any?(list, fn row ->

end)

end)

 

{{out|Sample output}}

 

=={{header|Erlang}}==

-module( loops_nested ).

 

 

random_array( Size ) -> [random:uniform(Size) || _X <- lists:seq(1, Size)].

 

=={{header|ERRE}}==

DIM A%[10,10] ! in declaration part

.............

! use a boolean variable or a GOTO label statement

END FOR

 

=={{header|Euphoria}}==

a = rand(repeat(repeat(20, 10), 10))

 

exit

end if

<code>exit</code> only breaks out of the innermost loop. A better way to do this would be a procedure.

 

=={{header|F_Sharp|F#}}==

//Nigel Galloway: November 10th., 2017

let n = System.Random()

Array2D.iter (fun n -> printf "%d " n) g; printfn ""

g |> Seq.cast<int> |> Seq.takeWhile(fun n->n<20) |> Seq.iter (fun n -> printf "%d " n)

{{out}}

<pre>

=={{header|Factor}}==

Whenever you need to break out of iteration early in Factor, you almost always want to use <code>find</code>. <code>find</code> is a tail-recursive combinator that searches a sequence. Its base case is satisfied when its predicate quotation returns <code>t</code>.

 

10 [ 20 [ 20 [1,b] random ] replicate ] replicate ! make a table of random values

 

Alternatively, calling <code>return</code> from inside a <code>with-return</code> quotation allows one to break out of the quotation. This is similar to the way other languages do things: with an explicit break. This is less elegant in Factor because it introduces an additional quotation and involves continuations when they aren't strictly necessary (resulting in slower execution than <code>find</code>).

sequences ;

 

[

[ [ dup pprint bl 20 = [ return ] when ] each nl ] each ! print values until 20 is found

{{out}}

<pre>

=={{header|Fantom}}==

There is no specific way to break out of nested loops (such as a labelled break, or goto). Instead, we can use exceptions and a try-catch block.

{

public static Void main ()

echo ("No 20")

}

 

=={{header|Forth}}==

 

10 constant X

20 = if unloop unloop exit then

loop

 

=={{header|Fortran}}==

{{works with|Fortran|77 and later}}

INTEGER A, I, J, RNDINT

 

ENDIF

RETURN

{{out|Sample output}}

<pre>A[ 1][ 1] is 2

{{works with|Fortran|90 and later}}

Here the special feature is that later Fortran allows loops to be labelled (with "outer" in this example) on their first and last statements. Any EXIT or CYCLE statements can then mention the appropriate label so as to be clear just which loop is involved, otherwise the assumption is the innermost loop only. And no "GO TO" statements need appear.

implicit none

 

end do outer

{{out|Sample output}}

<pre>

 

=={{header|FreeBASIC}}==

 

Randomize

Print

Print "Press any key to quit"

 

Sample output :

 

=={{header|Frink}}==

 

println["array is:\n" + formatTable[array, "right"] + "\n"]

if array@r@c == 20

break ROW

{{out}}

<pre>

=={{header|Gambas}}==

'''[https://gambas-playground.proko.eu/?gist=77521a9ffe6bebdfe2e34df8faab5e78 Click this link to run this code]'''

Dim siArray As New Short[5, 5]

Dim siCount0, siCount1 As Short

Print "Row " & Str(siCount0) & " column " & Str(siCount1) & " = 20"

 

Output:

<pre>

 

=={{header|GAP}}==

n := 40;

a := List([1 .. n], i -> List([1 .. n], j -> Random(1, 20)));;

end;

 

 

=={{header|Go}}==

 

import (

}

fmt.Printf("\n")

 

=={{header|Groovy}}==

{{Trans|Java}}

Solution:

def a = []

(0..<10).each {

}

}

{{out}}

<pre>[1, 19, 14, 16, 3, 12, 14, 18, 12, 6]

 

=={{header|Haskell}}==

breakIncl :: (a -> Bool) -> [a] -> [a]

breakIncl p = uncurry ((. take 1). (++)). break p

 

{{out|Example}}

*Main> mapM_ (mapM_ print) $ taskLLB 20 [[2,6,17,5,14],[1,9,11,18,10],[13,20,8,7,4],[16,15,19,3,12]]

2

10

13

 

=={{header|HicEst}}==

 

array = NINT( RAN(10,10) )

ENDDO

 

 

=={{header|Icon}} and {{header|Unicon}}==

Icon and Unicon use 'break' to exit loops and execute an expression argument. To exit nested loops 'break' is repeated as the expression.

 

every !(!(L := list(10)) := list(10)) := ?20 # setup a 2d array of random numbers up to 20

break break write("L[",i,",",j,"]=20")

 

if x = 20 then break write("L[",i,",",j,"]=20") # more succinctly

 

 

=={{header|J}}==

 

So, here's how the problem statement could be solved, without explicit loops (there's a conceptual nested loop and a short circuited search loop implemented within these primitives):

Here's how the problem could be solved, using loops:

for_row. i.#y do.

for_col. i.1{$y do.

end.

end.

{{out|Example use}}

<pre> use ?.20 20 $ 21

 

=={{header|Java}}==

 

public class NestedLoopTest {

System.out.println();

}

 

=={{header|JavaScript}}==

Demonstrates use of <code>break</code> with a label.

Uses <code>print()</code> function from [[Rhino]].

var a = [[2, 12, 10, 4], [18, 11, 9, 3], [14, 15, 7, 17], [6, 19, 8, 13], [1, 20, 16, 5]];

 

}

}

 

In a functional idiom of JavaScript, however, we can not use a loop statement, as statements return no value and can not be composed within other functional expressions. Functional JavaScript often replaces a loop with a map or fold. In this case, we can achieve the same task by defining the standard list-processing function '''takeWhile''', which terminates when a condition returns true.

Using the same data as above, and returning the trail of numbers up to twenty from a nested and composable expression:

 

20, 16, 5]];

 

return a.concat(x);

}).join('\n')

 

Output:

12

10

8

13

 

=={{header|jq}}==

and in this entry, it is used in the following function:

 

# produce a stream of the matrix elements (taken row-wise)

# up to but excluding the first occurrence of $max

| {i: range(0;$m), j: range(0;$n)}

| $matrix[.i][.j] as $m

 

The nesting above could be made more visually explicit, for example, by using

to an array of arrays is useful:

 

# to create successive rows, each row having at most n items.

def reshape(s; n):

else .j += 1

end)

 

Assuming the availability of rand/1 (e.g. as defined below),

we can now readily define functions to create the matrix and pretty-print the

items as required:

def randomMatrix(m; n; max):

reshape(limit(m * n; rand(max) + 1); n);

 

# Main program for the problem at hand.

 

{{out}}

 

''' PRNG '''

# as rand() from the Microsoft C Runtime.

# Input: [ count, state, random ]

# A random integer in [0 ... (n-1)]:

# rand_Microsoft returns an integer in 0 .. 32767

 

=={{header|Jsish}}==

Math.srand(0);

var nrows = Math.floor(Math.random() * 4) + 4;

[ 16, 3, 2, 19, 1, 4, 8, 4, 11, 18 ] ]

=!EXPECTEND!=

 

{{out}}

 

=={{header|Julia}}==

M = [rand(1:20) for i in 1:5, j in 1:10]

R, C = size(M)

end

end

{{out}}

<pre>

 

=={{header|Kotlin}}==

 

fun main(args: Array<String>) {

}

println()

{{out}}

<pre>array:

 

=={{header|Lambdatalk}}==

1) the A.find function gets a value and a unidimensional array,

then retuns the item matching the value else -1

[18,4,2,14,15]

21 was not found

 

=={{header|Lasso}}==

 

array(2, 12, 10, 4),

array(18, 11, 9, 3),

#1 == 20 ? return

}

 

=={{header|Liberty BASIC}}==

for i = 1 to 10

for j = 1 to 10

if flag then exit for

next

 

=={{header|Lingo}}==

a = []

repeat with i = 1 to 20

end repeat

if v=20 then exit repeat

 

=={{header|Lisaac}}==

 

+ name := TEST_LOOP_NESTED;

};

'\n'.print;

 

=={{header|LiveCode}}==

repeat with j = 1 to 10

put random(20) into aNums[i,j]

else

put "20 not found"

 

=={{header|Logo}}==

 

for [j 1 10] [for [i 1 10] [mdsetitem list :i :j :a (1 + random 20)]]

]

end

 

=={{header|Lua}}==

for i = 1, 20 do

t[i] = {}

end

end

 

=={{header|M2000 Interpreter}}==

 

 

Module Checkit {

Dim A(10,10)<<Random(1, 20)

}

Checkit

 

=={{header|Maple}}==

for i from 1 to m do

for j from 1 to n do

end if;

end do;

 

=={{header|Mathematica}}/{{header|Wolfram Language}}==

If[m[[i, j]] === 20, Return[]],

{i, 1, Dimensions[m][[1]]},

 

=={{header|MATLAB}} / {{header|Octave}}==

Loops are considered slow in Matlab and Octave, it is preferable to vectorize the code.

A non-vectorized version of the code is shown below in Octave

 

=={{header|Maxima}}==

 

find_value(a, x) := block(

 

find_value(data, 100);

 

=={{header|MAXScript}}==

fn scan_Nested arr =

(

)

)

 

Example:

testArray = #(#(1,5,2,19),#(11,20,7,2))

scan_nested testArray

OK

 

 

=={{header|Microsoft Small Basic}}==

For col = 0 To 10

array[row][col] = Math.GetRandomNumber(20)

EndFor

EndFor

{{out}}

<pre>row 0 col 0 value 11

 

=={{header|MOO}}==

for i in [1..10]

for j in [1..10]

s = "";

endfor

 

=={{header|MUMPS}}==

;.../loops/nested

;set up the 2D array with random values

FOR I=1:1:K Q:FLAG W ! FOR J=1:1:K WRITE A(I,J),$SELECT(J'=K:", ",1:"") SET FLAG=(A(I,J)=TRIGGER) Q:FLAG

KILL A,I,J,K,FLAG,TRIGGER

{{out}}

<pre>USER>D NESTLOOP^ROSETTA

 

=={{header|Neko}}==

Loops/Nested in Neko

Tectonics:

if $istrue(inner) break;

row += 1;

 

{{out}}

{{trans|C#}}

Nemerle can jump out of a named block by invoking the blocks name with an optional return value.

using System.Console;

using Nemerle.Imperative;

}

}

 

=={{header|NetRexx}}==

options replace format comments java crossref savelog symbols nobinary

 

finally

say

I was somewhat disappointed by the performance of the above program

and started a little performance analysis on solutions of this task

 

=={{header|NewLISP}}==

(dotimes (i 10)

(dotimes (j 10)

(print " ")

(if (= 20 (a i j))

 

=={{header|Nim}}==

 

const ArrSize = 10

s.add('\n')

 

 

{{out}}

 

=={{header|NS-HUBASIC}}==

20 FOR I=1 TO 20

30 A(I)=RND(20)+1

120 PRINT A(I);

130 IF A(I)=20 THEN END

 

=={{header|OCaml}}==

In the interactive interpreter:

 

 

# Random.self_init();;

15 3 5 19 17 3 1 11 5 2

1 1 6 19 20

 

=={{header|Octave}}==

Octave has no way of exiting nested loop; so we need a control variable, or we can use the trick of embedding the loops into a function and use the <tt>return</tt> statement. (The search for "exactly 20" is changed into a search for "almost 20")

% create a 100x100 matrix...

m = unifrnd(0,20, 100,100);

break;

endif

 

=={{header|OoRexx}}==

do i = 1 to 10

do j = 1 to 10

leave i

end

 

=={{header|Oz}}==

We can directly access and use the outer loop's break procedure:

fun {CreateMatrix Width Height}

Matrix = {List.make Height}

end

in

 

=={{header|PARI/GP}}==

 

=={{header|Pascal}}==

{{works with|FreePascal|1.0}}

uses SysUtils;

const Ni=10; Nj=20;

end;

loopend:

 

=={{header|Perl}}==

 

Outer:

print "\n";

}

 

=={{header|Phix}}==

use an explicit flag

<span style="color: #008080;">constant</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sq_rand</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">20</span><span style="color: #0000FF;">,</span><span style="color: #000000;">20</span><span style="color: #0000FF;">),</span><span style="color: #000000;">20</span><span style="color: #0000FF;">))</span>

<span style="color: #004080;">integer</span> <span style="color: #000000;">found</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>

<span style="color: #008080;">if</span> <span style="color: #000000;">found</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>

<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>

alternatively you can use a procedure

<span style="color: #008080;">procedure</span> <span style="color: #000000;">till20</span><span style="color: #0000FF;">()</span>

<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">20</span> <span style="color: #008080;">do</span>

<span style="color: #000000;">till20</span><span style="color: #0000FF;">()</span>

<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">)</span>

or a goto

<span style="color: #008080;">procedure</span> <span style="color: #000000;">till20</span><span style="color: #0000FF;">()</span>

<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">20</span> <span style="color: #008080;">do</span>

<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>

<span style="color: #000000;">till20</span><span style="color: #0000FF;">()</span>

 

=={{header|PHP}}==

for ($i = 0; $i < 10; $i++)

for ($j = 0; $j < 10; $j++)

}

echo "\n";

 

=={{header|PicoLisp}}==

(T

(for N Lst

(printsp N)

or:

(for Lst (make (do 10 (link (make (do 10 (link (rand 1 20)))))))

(for N Lst

(printsp N)

 

=={{header|Pike}}==

inner loop. However it's there if you want it:

 

int main()

{

write("\n");

}

 

=={{header|PL/I}}==

x = random()*20 + 1;

loops:

end;

if x(i,j) = 20 then leave;

 

=={{header|PureBasic}}==

Dim Value(10, 5)

For a = 0 To 10

EndIf

Next

 

=={{header|Python}}==

Python has only inner loop breaks. The normal way to solve this problem in Python is to move the code in a function, and use return:

 

def do_scan(mat):

 

mat = [[randint(1, 20) for x in xrange(10)] for y in xrange(10)]

The , after print element suppresses printing a line break. The code needs some minor changes for Python 3.

 

Two more solutions around this problem, the first uses exception handling:

 

class Found20(Exception):

print

except Found20:

The second uses a flag variable:

 

mat = [[randint(1, 20) for x in xrange(10)] for y in xrange(10)]

print

if found20:

 

=={{header|Qi}}==

(define random-list

0 -> []

 

(array->list 20 (random-array 10 10))

 

=={{header|Quackery}}==

 

5 times

[ []

[ echo sp ] ]

iff conclude

 

{{out}}

 

=={{header|R}}==

n <- 10

mat <- matrix(sample(1:20L, m*n, replace=TRUE), nrow=m); mat

break

}

 

or

 

m <- 10; n <- 10; mat <- matrix(sample(1:20L, m*n, replace=TRUE), nrow=m);

x<-which(mat==20,arr.ind=TRUE,useNames=FALSE)

for(i in mat[1:x[1,1]-1,]) print(i)

for(i in mat[x[1,1],1:x[1,2]]) print(i)

 

=={{header|Racket}}==

#lang racket

(define (scan xss)

(+ (random 20) 1))))

 

 

=={{header|Raku}}==

(formerly Perl 6)

{{works with|rakudo|2015-09-18}}

 

LINE: for @a -> @line {

print "\n";

}

{{out}}

<pre> 15 6 14 13 14 7 9 16 8 18

 

=={{header|REBOL}}==

Title: "Loop/Nested"

URL: http://rosettacode.org/wiki/Loop/Nested

]

]

{{out}}

<pre>Loop break using state variable:

 

=={{header|ReScript}}==

 

for _ in 0 to 9 {

} catch {

| Exit => Js.log("stop")

 

=={{header|REXX}}==

to contain the target (20), it's possible to not find the target.

<br>Code was added to this REXX program to reflect that possibility and issue an appropriate message (whether the target was found or not).

parse arg rows cols targ . /*obtain optional arguments from the CL*/

if rows=='' | rows=="," then rows=60 /*Rows not specified? Then use default*/

 

say right( space( 'Target' not "found:" ) targ, 33, '─')

'''output''' &nbsp; when using the default inputs:

<pre>

 

=={{header|Ring}}==

size = 5

array = newlist(size,size)

next

return aList

Output:

<pre>

As the break command only jumps out of the innermost loop,

this task requires Ruby's <code>catch/throw</code> functionality.

p ary

 

end

 

{{out}}

<pre>[[2, 12, 10, 4], [18, 11, 9, 3], [14, 15, 7, 17], [6, 19, 8, 13], [1, 20, 16, 5]]

 

However, for-loops are not very popular. This is more idiomatic ruby, which avoids loops and breaking out of them:

 

slices.any? do |slice|

end

end

{{out}}

<pre>

 

=={{header|Run BASIC}}==

cls

for row = 1 TO 10

next row

[end]

 

=={{header|Rust}}==

{{libheader|rand}}

 

extern crate rand;

println!();

}

{{out}}

<pre> 5 3 8 18 13 2 5 13 6 17

 

=={{header|Sather}}==

main is

a:ARRAY2{INT} := #(10,10);

end;

end;

 

=={{header|S-BASIC}}==

S-BASIC doesn't have a BREAK or EXIT statement for early termination of a loop, so the most straight-forward approach is to jump out using a GOTO. But since S-BASIC doesn't allow GOTOs from a FOR..NEXT loop, we have to use WHILE..DO instead.

$constant ROWS = 10

$constant COLUMNS = 10

 

end

The use of GOTO, while convenient, is at odds with S-BASIC's structured programming ethos. Adding a boolean flag to the inner loop allows us to avoid the GOTO. Although S-BASIC has no explicit boolean variable type, integers, real numbers, characters, and strings can all be used as boolean variables. For integers, 0 is false and -1 is true. For real variables, 0 is false and any non-zero value is true. For characters, 'T', 't', 'Y', and 'y' are evaluated as true, while 'F', 'f', 'N', and 'n' are evaluated as false. Strings follow the same rule, with only the first character considered.

$constant ROWS = 10

$constant COLUMNS = 10

 

end

{{out}}

The output is the same for both programs.

=={{header|Scala}}==

In Scala there is no build-in 'break' keyword. That functionality comes from a library.

val a=Array.fill(5,4)(scala.util.Random.nextInt(21))

println(a map (_.mkString("[", ", ", "]")) mkString "\n")

if (x==20) break

}

{{out}}

<pre>[14, 16, 5, 7]

=={{header|Scheme}}==

Using call/cc:

(lambda (return)

(for-each (lambda (a)

a)

(newline))

Using tail-call:

(if (pair? a)

(let loop2 ((b (car a)))

(else

(display " ")(display (car b))

 

=={{header|Scilab}}==

{{works with|Scilab|5.5.1}}

t=int(rand(ni,nj)*20)+1

for i=1:ni

printf("\n")

if t(i,j)==11 then break; end

{{out}}

<pre> 5 18 19 8

 

=={{header|Seed7}}==

 

const proc: main is func

catch FOUND20: writeln;

end block;

 

{{out}}

 

=={{header|Sidef}}==

 

for row in arr {

} @:OUT

 

{{out}}

<pre> 9 17 14 17 17 7 1 3 9 18

it looks a bit wierd, but here is: loopWithExit

 

 

i := 1.

i == 5 ifTrue:[ exit value:'stopped' ].

i := i + 1.

these can also be nested, and exited from the inner loop:

 

i := 1.

] loopWithExit.

i := i + 1

in case your smalltalk does not have it, here's the definition:

loopWithExit

"the receiver must be a block of one argument. It is evaluated in a loop forever,

 

exitBlock := [:exitValue | ^ exitValue].

in the same spirit, exits could be added to many other loop constructs. However, this is really only very rarely needed in Smalltalk, because a ^(return) out of a block returns from the enclosing method which usually used to exit early from search utility methods.

 

There is also valueWithExit, which can be used to get out of a block early and provide an alternative value. Using that, the tasks solution is:

 

v := 1 to:20 collect:[:i |

] ifFalse:[

'20 found at ' print. result printCR

{{out}}

<pre>19

 

The following code implements a BiArray class with a method that allows iteration over the elements (by columns and then by rows) and execution of a block if a condition is true.

lacks controls over the indexes, but has a way of iterating

over array's elements, from left to right and top to bottom"

"loop searching for 20; each block gets the element passed as argument"

biarr whileTrue: [ :v | v ~= 20 ]

 

=={{header|SPL}}==

mx,my = 30

> y, 1..my

<

<< x!>mx

{{out}}

<pre>

First, build the matrix:

 

forv i=1/20 {

forv j=1/20 {

matrix a[`i',`j']=runiformint(1,20)

}

 

Use nested '''[https://www.stata.com/help.cgi?forvalues forvalues]'''. If 20 is found, set a flag and break the inner loop. In the outer loop, check the flag and break the outer loop if 20 was found.

 

forv i=1/20 {

forv j=1/20 {

if !`q' {

display "not found"

 

Use nested '''[https://www.stata.com/help.cgi?while while]''' loops, and check both the loop indices and a flag. One could also use an inner forvalue loop together with an outer while loop.

 

local i=1

while !`q' & `i'<=20 {

if !`q' {

display "not found"

 

Use the exit/capture exception mechanism: '''[https://www.stata.com/help.cgi?exit_program exit]''' tos throw an exception, and '''[https://www.stata.com/help.cgi?capture capture]''' to catch it. Since this catches all exception, you have then to check the value of '''[https://www.stata.com/help.cgi?_variables _rc]'''.

 

forv i=1/20 {

forv j=1/20 {

display "not found"

}

 

=== Mata ===

In Mata, the situation is simpler: one may '''[https://www.stata.com/help.cgi?m2_return return]''' from a program without resort to exceptions, or use the '''[https://www.stata.com/help.cgi?m2_goto goto]''' statement. It's still possible to use '''[https://www.stata.com/help.cgi?m2_break break]''' and flags though.

 

n=rows(a)

p=cols(a)

}

return(q)

 

Then with any of these functions, the return value indicates whether x has been found in a, and i,j are the indices where it has been found.

 

findval1(a,20,i=.,j=.)

findval2(a,20,i=.,j=.)

 

=={{header|Swift}}==

 

loop: for row in array {

}

}

{{out}}

<pre> 2

=={{header|Tailspin}}==

In Tailspin you break processing by simply not sending a value on in the chain.

sink find20

def a: $;

 

[1..10 -> [1..10 -> 20 -> SYS::randomInt -> $ + 1]] -> !find20

{{out}}

<pre>

Tcl only supports single-level breaks; exiting more deeply nested looping requires the use of exceptions, which are considerably more verbose before Tcl 8.6.

{{works with|Tcl|8.6}}

 

try {

}

} trap MULTIBREAK {} {}

{{out}}

<pre> 12 13 14 13 15,

 

=={{header|TI-83 BASIC}}==

(A,B)→dim([C])

For(I,1,A)

End

 

 

=={{header|TI-89 BASIC}}==

The <code>Stop</code> statement exits the containing ''program''.

Local mat,i,j

© randMat(5, 5) exists but returns -9 to 9 rather than 1 to 20

EndFor

EndFor

 

=={{header|TUSCRIPT}}==

LOOP

row=""

ENDLOOP

PRINT row

{{out}}

<pre>

{{works with|Bash}}

Bash doesn't have two-dimentional arrays, so we fake it for this example

 

for ((i=0;i<size;i++)); do

echo

done

{{out|Example output}}

<pre> 7 5 4 6 4 5 2 15 10 7

 

=={{header|Vala}}==

int[,] a = new int[10, 10];

if (broken) break;

}

 

=={{header|VBA}}==

Dim a(1 To 10, 1 To 10) As Integer

Randomize

Debug.Print

Next i

 

=={{header|Visual Basic .NET}}==

 

The set-up code:

Sub Main()

Const ROWS = 10

' MISSING IMPLEMENTATION

End Sub

 

'''Implementations:'''

 

Perhaps the simplest solution is to use a goto.

For c = 0 To COLS - 1

Dim val = nums(r, c)

Next

Next

 

If, ''for some reason'', a goto is undesirable, an alternative would be to exit a dummy outer block (in this case a single-iteration Do loop).

For r = 0 To ROWS - 1

For c = 0 To COLS - 1

Next

Next

 

Either For loop can also be converted to a different type of loop.

Dim c = 0

Do While c <= COLS - 1

c += 1

Loop

 

The search can also be factored out to a separate method

For r = 0 To arr.GetLength(0) - 1

For c = 0 To arr.GetLength(1) - 1

Next

Next

 

and called from Main():

 

A translation of the VBA above, that sets the iteration variable of the outer For loop to an out-of-range value and exits the inner loop regularly.

For c = 0 To COLS - 1

Dim val = nums(r, c)

End If

Next

 

Similarly, a flag variable can be checked by the outer loop.

For r = 0 To ROWS - 1

For c = 0 To COLS - 1

Next

If done Then Exit For

 

{{out}}

 

=={{header|Vlang}}==

import rand.seed

 

println('')

}

 

=={{header|Wren}}==

{{libheader|Wren-fmt}}

Wren doesn't have ''goto'' or ''break label'' so to break out of nested loops you need to use a flag (''found'' in the code below).

import "/fmt" for Fmt

 

System.print()

if (found) break

 

{{out}}

{{works with|Windows XBasic}}

Break out of nested loops by means of an additional variable.

PROGRAM "loopsnested"

 

 

END PROGRAM

{{out}}

<pre>

 

=={{header|XPL0}}==

def Size=10;

 

[Fill(Array);

Nest(Array);

 

=={{header|zkl}}==

Using nested lists to simulate a 5x5 array. No breakbreak so an exception is used to long jump out of the loop (just 'cause, a state var could also be used).

var rows=(0).pump(N,List, (0).pump.fp(N,List,(1).random.fpM("1-",21)) );

try{

}

println("Not found");

{{out}}

<pre>

 

=={{header|ZX Spectrum Basic}}==

20 FOR i=1 TO 10: FOR j=1 TO 10

30 LET a(i,j)=INT (RND*20)+1

100 IF b=0 THEN PRINT

110 NEXT i

{{out|Example output}}

<pre>