30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int size = sizeof(n) * 8;
    int count = 0;
    for(int i = 0; i<size; i++){
        if(n & (1<<i) ){
            ++count;
        }
    }
    return count;
}

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