请帮我看看为啥赋不了值

#include<iostream>
#include<string>
using namespace std;

class Employee
{
public:
    Employee(string nam,string n):name(nam),num(n)
    {
        grade=1;
        wage=0;
    }
protected:
    string name;
    string num;
    int grade;
    double wage;
};

class Technician:virtual public Employee
{
private:
    int hour;
public:
    Technician(string nam,string n,int h):Employee(nam,n)
    {
        hour = h;
        grade = 3;
        wage =100*h;
    }
    void show_T();
    void get_T();
};

void Technician::show_T()
{
    cout<<"name:"<<name<<endl;
    cout<<"num:"<<num<<endl;
    cout<<"grade:"<<grade<<endl;
    cout<<"wage:"<<wage<<endl;
}

void Technician::get_T()
{
    cin>>hour;
}

int main()
{
    Technician t("t","2",100);
    t.get_T();                                  //我在这里对hour赋值为4，但为啥不起作用
    t.show_T();
    return 0；
}