30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int count = 0;
    if(n == 0)
    {
        return 0;
    }
    else
    {
        while (n & n-1)
        {
            count++;
            n &= n-1;
        }
        count++;
        return count;
    }
    
}

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