If the first operand to the logical AND operator evaluates to false the second operand is guaranteed not to evaluate. Note: the logical OR operator is guaranteed not to evaluate the second operand if the first operand is true. Note: for the logical AND and OR operators, all side effects of the first expression, except for destruction of temporaries, happen before the second expression is evaluated.
int main(int argc, char** argv)
int x = 0;
int y = 0;
if (x++ && y++)
y += 2;
std::cout << x + y << std::endl;
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