Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
     int count = 0;
    // for(int i = 0; i < 32; ++i){
    //     if((n >> i) & 0b1 == 1){
    //         ++count;
    //     }
    // }
    // return count;
    while(n){
        n = n & (n -1);
        ++count;
    }
     return count;
}

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

Solving Approach