30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int cnt = 0;

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

    return cnt;
}

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