30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    unsigned int temp_n = n;
    int count = 0;
    while(temp_n > 0) {
        int bit_val = temp_n & 1;
        temp_n = (temp_n >> 1);
        if (bit_val) {
            count++;
        } 
    }

    return count;
}

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