30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    int cnt = 0;
    for(int i = 0;i < 32; i++) {
        if(n & 0x01)
            cnt++;
        n = n >> 1;
    }
    return cnt;
}

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