Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    int e=0;
    int i=0;
    while(i<32){
        e+=(n>>i)&1;
        i++;
    }
    return e;
}

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