如何检查值是否具有偶数奇偶校验或奇数校验?

问题描述

如果一个值具有偶数个1位，则它具有偶数奇偶校验.如果值的奇数为1位，则它具有奇数奇偶校验.例如，0110具有偶校验，而1110具有奇校验.

A value has even parity if it has an even number of 1 bits. A value has an odd parity if it has an odd number of 1 bits. For example, 0110 has even parity, and 1110 has odd parity.

如果x具有偶校验，我必须返回1.

I have to return 1 if x has even parity.

int has_even_parity(unsigned int x) {
    return 
}

推荐答案

尝试:

int has_even_parity(unsigned int x){
    unsigned int count = 0, i, b = 1;

    for(i = 0; i < 32; i++){
        if( x & (b << i) ){count++;}
    }

    if( (count % 2) ){return 0;}

    return 1;
}

瓦尔特

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