Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    unsigned int k=0;
    while(n)
    {
        k=k+ (n&1);
        n=n>>1;
    }
    return k;
}

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