Problem Statement

Show a loop which prints random numbers (each number newly generated each loop) from 0 to 19 (inclusive). If a number is 10, stop the loop after printing it, and do not generate any further numbers.
Otherwise, generate and print a second random number before restarting the loop.
If the number 10 is never generated as the first number in a loop, loop forever.

Let's start with the solution:

If OpenConsole()

  Repeat
    a = Random(19)
    PrintN(Str(a))
    If a = 10
      Break
    EndIf 
    b = Random(19)
    PrintN(Str(b))
    PrintN("")
  ForEver

  Print(#CRLF$ + #CRLF$ + "Press ENTER to exit")
  Input()
  CloseConsole()
EndIf