Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    int count = 0; 
    while(n){
        n &= (n - 1);
        count ++;
    }

    return count;
}

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

Solving Approach
 

By using Brian Kernighan's Algorithm. Subtracting and clearing until n becomes 0.