Programming in Objective-C, Sixth Edition

for Loop Variants

Before leaving this discussion of the for loop, we should mention some of the syntactic variations that are permitted in forming this loop. When writing a for loop, you might discover that you want to initialize more than one variable before the loop begins, or perhaps you want to evaluate more than one expression each time through the loop. You can include multiple expressions in any of the fields of the for loop, as long as you separate such expressions by commas. For example, in the for statement that begins

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for ( i = 0, j = 0; i < 10; ++i )   ...

the value of i is set to 0 and the value of j is set to 0 before the loop begins. The two expressions i = 0 and j = 0 are separated from each other ...