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A.7.15 Logical OR Operator
- logical-OR-expression:
- logical-AND-expression
logical-OR-expression || logical-AND-expression
- logical-AND-expression
The || operator groups left-to-right. It returns 1 if either of its operands compare unequal to zero, and 0 otherwise. Unlike |, || guarantees left-to-right evaluation: the first operand is evaluated, including all side effects; if it is unequal to 0, the value of the expression is 1. Otherwise, the right operand is evaluated, and if it is unequal to 0, the expression's value is 1, otherwise 0.
The operands need not have the same type, but each must have arithmetic type or be a pointer. The result is int.