Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here

    int counter = 0, input_size = sizeof(n);
    input_size = input_size * 8;
    for(int i=0; i<input_size; i++)
    {
        if(n & (1 << i)){ // 5  - 0101  0001
        counter++;
        }
    }
    return counter;
}

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

Solving Approach