c - 当 x 为负时，!x 是否等于真？

Question

int main() {
    
    int x = -1;
                    
    if (!x) {
        printf("Yes\n");
                
    }
}

当 !x 是负数时 x 是真的还是只有 0 时它是真的？

Answer 1

对于任何非零 x ， !x 将为零。所以，对于 x == -1 ， !x 是假的。
来自 cppreference :

The logical NOT operator has type int. Its value is ​0​ if expressionevaluates to a value that compares unequal to zero. Its value is 1 ifexpression evaluates to a value that compares equal to zero.