给定如下C++代码：

#include <iostream>
using namespace std;
int main() {
    int num;
    cin >> num;
    int hundreds = num / 100;
    int tens = (num % 100) / 10;
    int units = num % 10;
    cout << hundreds << " " << tens << " " << units << endl;
    return 0;
}

当输入整数456时，程序的输出结果是？