30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int count = 0 ;
    int size = sizeof(n) * 8;

    for(int x = 0 ; x < size ; x++)
        count += ((n>>x) & 0x01)? 1 : 0 ;

    return count;
}

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