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Message: [QUOTE="Keith Thompson, post: 3783558"] [i] [...] I'm going to take issue with your use of the word "the". Any scalar expression with the value 0 is false when used in a context that requires a condtion. *Any* non-zero value is true. The equality and relational operators happen to be guaranteed to yield the value 1 when the condition is true (likewise for "&&" and "||"); the code we're disucssion takes advantage of that fact. Other operations that yield conditions might yield any arbitrary non-zero value when the condition is true. For example, this: if ((x <= y) == isdigit(z)) won't necessarily work, since isdigit() can return any non-zero value when z is a digit; both conditions could be true, but (0 == 42) is false. (If C had a real Boolean type *and used it consistently for conditions*, this might not be an issue.)[/i] [/QUOTE]