30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int N) {
    // Write your code here
    int count = 0;
     while (N > 0) {
        count += (N & 1); // check last bit
        N = N >> 1; 
 }
 return count;
}

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