Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    int res =0;
    unsigned int x = (unsigned int )n;
    for(int i=0; i<=31; i++)
    {
        if((x >> i ) & 1)
        {
            res = res +1; 
        }
    }
    return res;
}

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

Solving Approach