30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    const int size = 32;
    int count = 0;
    for( int i = 0; i < 32; i++){
        if( 0 != (n & (0x1 << i))){
            count++;
        }
    }
    return count;
}

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