30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    unsigned int shift = n;
    unsigned int count = 0;

    while (shift != 0) {
        if (shift & 0x01) {
            count += 1;
        }
        shift = shift >> 1;
    }

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