What do you think that STEP -1 means?

Answer:

It means that COUNTER changes by -1 each time.

Stepping Back

Most of the time, you want to count upwards "by ones." In this case, use the FOR statement without STEP, as in the previous chapter. If you want the counter to change by some amount other than 1, use STEP.

Here is another program:

FOR COUNTER = 0 TO 10 STEP 2
  PRINT "Counter:", COUNTER
NEXT COUNTER
'
END

QUESTION 4:

What do you suppose this program prints out?