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:

procedure main()
every writes(i := 1 to 10) do 
   if i = 10 then break write()
   else writes(", ")
end


every writes(c := "",1 to 10) do c := ","