30. Count Set Bits in an Integer

#include <stdio.h>
#include <stdlib.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int count = 0;
    for(int i = 31;i >= 0;i--){
        if(n & (1 << i)){
        count++;
            }
    }
    return count;
   
}

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