Count Set Bits in an Integer

Optimized Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    int ret = (n & 1);
    
    while (n)
    {
        n >>= 1;
        if (n & 1) ++ret;
    }

    return ret;
}

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