30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int sum = 0;

    for(int i = 0; i < 32; i++){

        sum += (n & (1 << i)) >> i;
    }
    return sum;

}

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