c - C中 "=="运算符的返回值

Question

我是否可以假设在 C 中，如果两个值相等，“==”运算符的计算结果总是为 1，或者它可以计算为其他“真”值？

struct ss {
    int id;
};

struct os {
    int sid;
    int state;
};

int count(struct ss *s, int state)
{
    int num = 0;
    // foreach o (of type os*) in a hash table
        num += o->state == state && (s ? o->sid == s->id : 1);

    return num;
}

那么 o->sid == s->id 将始终返回 1 或 0，或者它可以返回其他值？

Answer 1

Can I assume that in C, the "==" operator will always evaluate to 1 if the two values are equal or it can evaluate to other "true" values?

是的，!=也是> < >= <=所有的关系运算符。

C11(ISO/IEC 9899:201x) §6.5.8 关系运算符

Each of the operators < (less than), > (greater than), <= (less than or equal to), and >= (greater than or equal to) shall yield 1 if the specified relation is true and 0 if it is false.107) The result has type int.