Show a nested loop which searches a two-dimensional array filled with random numbers uniformly distributed over 



[
1
,
…
,
20
]


{\displaystyle [1,\ldots ,20]}

.

The loops iterate rows and columns of the array printing the elements until the value 



20


{\displaystyle 20}

 is met.

Specifically, this task also shows how to break out of nested loops.



Related tasks

   Loop over multiple arrays simultaneously
   Loops/Break
   Loops/Continue
   Loops/Do-while
   Loops/Downward for
   Loops/For
   Loops/For with a specified step
   Loops/Foreach
   Loops/Increment loop index within loop body
   Loops/Infinite
   Loops/N plus one half
   Loops/Nested
   Loops/While
   Loops/with multiple ranges
   Loops/Wrong ranges


use Random;
 
var nums:[1..10, 1..10] int;
var rnd = new RandomStream();
 
[ n in nums ] n = floor(rnd.getNext() * 21):int;
delete rnd;
 
// this shows a clumsy explicit way of iterating, to actually create nested loops: 
label outer for i in nums.domain.dim(1) {
        for j in nums.domain.dim(2) {
                write(" ", nums(i,j));
                if nums(i,j) == 20 then break outer;
        }
        writeln();
}