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for StatementA for statement uses three expressions written inside a
parenthetical group to define the repetition of the loop. The first
expression says how to prepare to start the loop. The second says how
to test, before each iteration, whether to continue looping. The
third says how to advance, at the end of an iteration, for the next
iteration. All together, it looks like this:
for (start; continue-test; advance) body
The first thing the for statement does is compute start.
The next thing it does is compute the expression continue-test.
If that expression is false (zero), the for statement finishes
immediately, so body is executed zero times.
However, if continue-test is true (nonzero), the for
statement executes body, then advance. Then it loops back
to the not-quite-top to test continue-test again. But it does
not compute start again.