俩个int型变量m,n中有多少个bit位不同。

#include<stdio.h>

#include<stdlib.h>

int main()

{

int diff_count();

int num1 = 0;

int num2 = 0;

scanf("%d", &num1);

scanf("%d", &num2);

int ret = diff_count(num1, num2);

printf("%d\n", ret);

return 0;

}

int diff_count(int x, int y)

{

int tmp = x^y;

int count = 0;

while (tmp)

{

count++;

tmp &= (tmp - 1);

}

return count;

}

理解x^y的含义以及tmp &= (tmp - 1)这俩个表达式。