计算二进制数的0的个数

#include <iostream>

using namespace std;

int calZeroNum(int num)
{
    if (0 == num)
    {
        return 0;
    }
    int count = 0;
    while (0 != num)
    {
        if (0 == (num & 1))
        {
            count ++;
        }
        
        num = num >>1;
    }
    return count;
}
int main()
{
    int num =0;
    cin>>num;
    cout<<calZeroNum(num)<<endl;
    return 0;
}