29.4
The Comma Operator
The comma operator (,) can be
used to group statements. For example:
if (total < 0) {
std::cout << "You owe nothing\n";
total = 0;
}
can be written as:
if (total < 0)
std::cout << "You owe nothing\n", total = 0;
In most cases, { } should be used instead of a comma. About the only
place the comma operator is useful is in a for statement. The following for loop increments two counters,
two and three, by 2 and 3:
for (two = 0, three = 0;
two < 10;
two += 2, three += 3)
std::cout << two << ' ' << three << '\n';
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