created 04/17/98; revised: 01/03/99, 10/28/99, 01/22/00, 07/20/02, 05/25/03
for statement is
a convenient way to program counting loops,
it can be used to build all of the three types of loops.
Anything it does could also be done with the fundamental control
statements you already know.
for statement often says just what you want in a
compact, easily understood format.