Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    int sum;
    for(int i=0; i<sizeof(unsigned int)*8; i++){
        sum += (n >> i) & 1;
    }
    return sum;
}

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

Solving Approach