30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int countbits = 0;
    if(n == 0) return 0;
    while(n)
    {
        countbits += (n & 1);
        n >>= 1;
    }

    return countbits;
}

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