Exercises - Combining Loops

What happens when the following exec runs?

DO outer = 1 TO 3
  SAY                  /* Write a blank line                       */
  DO inner = 1 TO 3
    SAY 'Outer' outer 'Inner' inner
  END
END

Now what happens when the LEAVE instruction is added?

DO outer = 1 TO 3
  SAY                  /* Write a blank line                       */
  DO inner = 1 TO 3
    IF inner = 2 THEN
      LEAVE inner
    ELSE
      SAY 'Outer' outer 'Inner' inner
  END
END

ANSWERS

When this example runs, you see on your screen the following:

   Outer 1  Inner 1
   Outer 1  Inner 2
   Outer 1  Inner 3

   Outer 2  Inner 1
   Outer 2  Inner 2
   Outer 2  Inner 3

   Outer 3  Inner 1
   Outer 3  Inner 2
   Outer 3  Inner 3

The result is one line of output for each of the inner loops.

   Outer 1  Inner 1

   Outer 2  Inner 1

   Outer 3  Inner 1