Problem Statement

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.

Let's start with the solution:

'fill array
mx,my = 30
> y, 1..my
  > x, 1..mx
    a[x,y] = #.rnd(20)+1
  <
<
'scan array
> y, 1..my
  > x, 1..mx
    #.output("x=",x,", y=",y, ", a=",a[x,y])
    << a[x,y] = 20
  <
  << x!>mx
<