我想用showall函数来显示所有人员的信息，但是编译出错。还有怎样才可以以文件方式将输入的各类人员信息进行保存。求各位大神指点。

代码如下：

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

class employee                                                  //声明基类职工类employee
{public:                                             
protected:                                                          
 string number;
 string name;
 int age;
 string sex;                                                  
 int grade;                                                            //以上五行为私有数据成员
};

class technician:public employee                         
{public:
 void input1();
void show1();
float data1()
{float worktime;
cout<<"please enter the worktime:"<<endl;
cin>>worktime;
wages=worktime*100;
return 0;
}
 protected:
float wages;
};
   
 void technician::input1()                 //用于输入技术员的信息
 {cout<<"you choice the technicians input"<<endl;
 cout<<"please enter the technician's number:"<<endl;
 cin>>number;
    cout<<"please enter the technician's name:"<<endl;
 cin>>name;
 cout<<"please enter the technician's age:"<<endl;
 cin>>age;
 cout<<"please enter the technician's sex:"<<endl;
 cin>>sex;
 cout<<"please enter the technician's grade:"<<endl;
 cin>>grade;
 }
 void technician::show1()                //用于输出技术员的信息
 {cout<<"number:"<<number<<endl;
    cout<<"name:"<<name<<endl;
    cout<<"age:"<<age<<endl;
    cout<<"sex:"<<sex<<endl;
 cout<<"position:technician"<<endl;
 cout<<"wages:"<<wages<<endl;
 cout<<"grade:"<<grade<<endl;
 }

class salesman:public employee                                  //声明销售员类salesman，公有继承职工基类employee
{public:
void input2();
void show2();
float data2()                                                   //定义计算销售员工资的函数
{float salesvalume;                                              
cout<<"please enter the salesvalume:"<<endl;                          //从键盘上输入销售额
cin>>salesvalume;
wages=salesvalume*0.04;
return 0;
}
protected:
 float wages;                                                //wages为保护成员
};

void salesman::input2()
{cout<<"you choice the salesmans input"<<endl;
 cout<<"please enter the salesman's number:"<<endl;
 cin>>number;
    cout<<"please enter the salesman's name:"<<endl;
 cin>>name;
 cout<<"please enter the salesman's age:"<<endl;
 cin>>age;
 cout<<"please enter the salesman's sex:"<<endl;
 cin>>sex;
 cout<<"please enter the salesman's grade:"<<endl;
 cin>>grade;
}
void salesman::show2()                                       //在类外定义成员函数show2，用于输出salesman的相关信息
{cout<<"number:"<<number<<endl;
    cout<<"name:"<<name<<endl;
    cout<<"age:"<<age<<endl;
    cout<<"sex:"<<sex<<endl;
 cout<<"position:salesman"<<endl;
    cout<<"wages:"<<wages<<endl;
 cout<<"grade:"<<grade<<endl;
}

class manager:public employee
{public:
void input3();
void show3();
float data3()
{wages=8000;
return 0;
}
protected:
 float wages;
};

void manager::input3()                 //用于输入经理的信息
 {cout<<"you choice the managers input"<<endl;
 cout<<"please enter the manager's number:"<<endl;
 cin>>number;
    cout<<"please enter the manager's name:"<<endl;
 cin>>name;
 cout<<"please enter the manager's age:"<<endl;
 cin>>age;
 cout<<"please enter the manager's sex:"<<endl;
 cin>>sex;
 cout<<"please enter the manager's grade:"<<endl;
 cin>>grade;
 }
 void manager::show3()                //用于输出经理的信息
 {cout<<"number:"<<number<<endl;
    cout<<"name:"<<name<<endl;
    cout<<"age:"<<age<<endl;
    cout<<"sex:"<<sex<<endl;
 cout<<"position:manager"<<endl;
 cout<<"wages:"<<wages<<endl;
 cout<<"grade:"<<grade<<endl;
 }

class salesmangaer:public employee
{public:
void input4();
void show4();
float data4()
{float salesvalume;
cout<<"please enter the salesvalume:";                          //从键盘上输入销售额
cin>>salesvalume;
wages=salesvalume*0.005+5000;
return 0;
}
private:
 float wages;

};

void salesmangaer::input4()                 //用于输入经理的信息
 {cout<<"you choice the salesmangaers input"<<endl;
 cout<<"please enter the salesmangaer's number:"<<endl;
 cin>>number;
    cout<<"please enter the salesmangaer's name:"<<endl;
 cin>>name;
 cout<<"please enter the salesmangaer's age:"<<endl;
 cin>>age;
 cout<<"please enter the salesmangaer's sex:"<<endl;
 cin>>sex;
 cout<<"please enter the salesmangaer's grade:"<<endl;
 cin>>grade;
 }
 void salesmangaer::show4()                //用于输出经理的信息
 {cout<<"number:"<<number<<endl;
    cout<<"name:"<<name<<endl;
    cout<<"age:"<<age<<endl;
    cout<<"sex:"<<sex<<endl;
 cout<<"position:salesmangaer"<<endl;
 cout<<"wages:"<<wages<<endl;
 cout<<"grade:"<<grade<<endl;
 }

int add1()
{salesman salem;
salem.input2();
salem.data2();
salem.show2();
return 0;
}
 
int add2()
{technician techni;
techni.input1();
techni.data1();
techni.show1();
return 0;
}

int add3()
{manager manag;
manag.input3();
manag.data3();
manag.show3();
return 0;
}

int add4()
{salesmangaer salemanag;
salemanag.input4();
salemanag.data4();
salemanag.show4();
return 0;
}

int showall()             //显示所有人员的信息
{int j;
 for(j=1;j<=100;j++)
 salesman.show2()
technician.show1()
manager.show3()
salesmangaer.show4()
}

float new1()
{cout<<"请选择想要输入的人员:"<<endl;
 cout<<"1:销售员"<<endl;
 cout<<"2:技术员"<<endl;
 cout<<"3:经理"<<endl;
 cout<<"4:销售经理"<<endl;
 cout<<"5:显示所有人员信息"<<endl;
 int a;
 cin>>a;
 switch (a)
 {case 1:add1();break;
 case 2:add2();break;
 case 3:add3();break;
 case 4:add4();break;
 case 5:showall();break;
 }
return 0;
}

int main()
{int i;
 for(i=1;i<=100;i++)
 new1();
return 0;}