题解 | #查找输入整数二进制中1的个数#

#include <stdio.h>

int main() {
    int n;
    int mask = 1;
    int sum = 0;

    while (scanf("%d", &n) != EOF) {
        sum = 0;
        mask = 1;
        for (; mask!=0; mask<<=1) {
            if ((n&mask) != 0) {
                sum++;
            } else {}
        }
        printf("%d\n", sum);
    }

    return 0;
}