Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) 
{
    int count=0;
    //It is one of the efficient way to count number of set bits.
    while(n)
    {
     n=n&(n-1);
     count++;
    }
    return count;
}

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

Solving Approach