Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    int count =0;
    for(int i =0; i<(sizeof(int)*8);i++){
        int mask =0;
        mask = 1<<i;
        int a = n&mask;
        if(a){
            count++;
        } 
    }
    return count;
}

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

Solving Approach