求助~不知道主函数哪错了~

[Iantone]

初步判断主函数错了，貌似switch有问题
此程序是计算四类职员工资


//定义基类
#include<iostream>
#include<string>
using namespace std;
class Pay
{
public:
void input()
{
cout<<"Please input the num:";
cin>>num;
cout<<"Please input the name:";
cin>>name;
}
void display()
{
cout<<"num:"<<num<<endl;
cout<<"name:"<<name<<endl;
cout<<"salary:"<<salary<<endl;
}
protected:
int num;
string name;
int salary;
};





//派生类
#include"class.h"
//经理
class Manager:virtual public Pay
{
public:
void calculate()
{
salary=8000;
}
};
//兼职技术人员
class Technician:public Pay
{
public:
void inputtime()
{
cout<<"Please input the worktime:";
cin>>worktime;
}
void calculate()
{
salary=worktime*100;
}
private:
int worktime;
};
//销售员
class Salesman:virtual public Pay
{
public:
void calculate()
{
salary=salesvolume*0.04;
}
void inputsalesvolume()
{
cout<<"Please input the salesvolume:";
cin>>salesvolume;
}
protected:
int salesvolume;
};
//销售经理（经理和销售员的派生类）
class Salesmanager:public Manager,public Salesman
{
public:
void calculate()
{
salary=salesvolume*0.05+5000;
}
};





//主函数
#include"inheritance.cpp"
int main()
{
int choice;
do
{
cout<<"\n[salary calculator]\n";
cout<<"-------------------------------\n";
cout<<"Please choose the staff member:\n";
cout<<"<1> Manager\n";
cout<<"<2> Technician\n";
cout<<"<3> Salesman\n";
cout<<"<4> Salesmanager\n";
cout<<"-------------------------------\n";
cout<<"<0> Quit\n";
cin>>choice;
switch(choice)
{
case 1:
{Manager a;
a.input;
a.calculate;
a.display;
};break;
case 2:
{Technician b;
b.input;
b.inputtime;
b.calculate;
b.display;
};break;
case 3:
{Salesman c;
c.input;
c.inputsalesvolume;
c.calculate;
c.display;
};break;
case 4:
{Salesmanager d;
d.input;
d.calculate;
d.display;
};break;
}
}while (choice!=0);
return 0;
}

[hen_hao_ji]

如下面这样，加括号，是调用成员函数

	a.input();
				a.calculate();
				a.display();

[写给我自己]

//class.h

#include<iostream>
#include<string>

#ifndef CLASS_H
#define CLASS_H

using namespace std;
class Pay
{
public:
	void input()
	{
		cout<<"Please input the num:";
		cin>>num;
		cout<<"Please input the name:";
		cin>>name;
	}
	void display()
	{
		cout<<"num:"<<num<<endl;
		cout<<"name:"<<name<<endl;
		cout<<"salary:"<<salary<<endl;
	}
protected:
	int num;
	string name;
	int salary;
};
#endif

//inheritance.cpp

#include"class.h"
//经理
class Manager:virtual public Pay
{
public:
	void calculate()
	{
		salary=8000;
	}
};
//兼职技术人员
class Technician:public Pay
{
public:
	void inputtime()
	{
		cout<<"Please input the worktime:";
		cin>>worktime;
	}
	void calculate()
	{
		salary=worktime*100;
	}
private:
	int worktime;
};
//销售员
class Salesman:virtual public Pay
{
public:
	void calculate()
	{
		salary=salesvolume*0.04;
	}
	void inputsalesvolume()
	{
		cout<<"Please input the salesvolume:";
		cin>>salesvolume;
	}
protected:
	int salesvolume;
};
//销售经理（经理和销售员的派生类）
class Salesmanager:public Manager,public Salesman
{
public:
	void calculate()
	{
		salary=salesvolume*0.05+5000;
	}
};

//main()

#include "inheritance.cpp"
int main()
{
	int choice;
	do  
	{
		cout<<"\n[salary calculator]\n";
		cout<<"-------------------------------\n";
		cout<<"Please choose the staff member:\n";
		cout<<"<1> Manager\n";
		cout<<"<2> Technician\n";
		cout<<"<3> Salesman\n";
		cout<<"<4> Salesmanager\n";
		cout<<"-------------------------------\n";
		cout<<"<0> Quit\n";
		cin>>choice;
		switch(choice)
		{
		case 1:
			{Manager a;
			a.input();
			a.calculate();
			a.display();
			};break;
		case 2:
			{Technician b;
			b.input();
			b.inputtime();
			b.calculate();
			b.display();
			};break;
		case 3:
			{Salesman c;
			c.input();
			c.inputsalesvolume();
			c.calculate();
			c.display();
			};break;
		case 4:
			{Salesmanager d;
			d.input();
			d.calculate();
			d.display();
			};break;
		}
	}while (choice!=0);
	return 0;
}