30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    unsigned int sum = 0;
    for(int i = 0; i < 32; i++){
        if(n == 0){break;}
        sum += n & 0x1U;
        n = n >> 1;
    }
    return sum;
}

int main() {
    int n;
    scanf("%d", &n);
    printf("%d", countSetBits(n));
    return 0;
}