30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    int val = 0;
    for (int i = 0; i < 32; i++) {
        if ((n & (1U << i)) != 0) {
            val++;
        }
    }
    return val;
}

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