Description |
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Use the comma operator to separate two expressions that are
to be evaluated one right after the other. The comma operator is
popular within for loops, as demonstrated by the following example:
for (i = 10, j = 4; i * j < n; i++, j++);
In the preceding example, the comma operator allows you to
initialize both i and j at the beginning of the loop. The comma operator
also allows you to increment i and j together at the end of each loop iteration.
All expressions return values. When you use a comma operator,
the expression returns the value of the rightmost expression. For
example, the following statement sets variable j to 2:
j = (x = 1, y = 2);
Assignments such as these, however, are considered poor programming
style. You should confine use of the comma operator to for loops.
