Problem Statement

Quite often one needs loops which, in the last iteration, execute only part of the loop body. Demonstrate the best way to do this. Write a loop which writes the comma-separated list using separate output statements for the number and the comma from within the body of the loop.

Let's start with the solution:

  1:?i
&   whl
  ' ( put$!i
    & !i+1:~>10:?i
    & put$", "
    )