c++项目范例

 #include<iostream>
 #include<string.h>
 #include<stdlib.h>
 using namespace std;
 class Card
 {
 protected:
      float remain;
 public:
     Card(){}
     Card(float _remain):remain(_remain){}
     float Getremain(){return remain;}
     float credit(float _price);
     float recharge(float moneny);
     virtual void showmoney()=;
     virtual void isme(float a)=;
     virtual void showinfo()=;
     virtual const char* Getname()=;
     //virtual bool operator >(Card *c) = 0;
 };

 class Stu : public Card
 {
 protected:
     int stunum;
     const char *name;
 public:
     Stu(){}
     Stu(int num,const char* _name):stunum(num),name(_name){}
     Stu(float _remain,int num,const char *_name):Card(_remain),stunum(num),name(_name){}
     void showmoney();
     void isme(float a);
     void showinfo();
     const char *Getname()    {return name;}
     bool operator >(Card *c);
 };
 bool Stu::operator >(Card *c)
 {
 if(remain>c->Getremain())
 return true;
 else
 return
     false;
 }
 void Stu::showmoney()
 {}
 void Stu::isme(float a)
 {
     remain=remain - a;

 }
 void Stu::showinfo()
 {
 cout<<name<<"\t"<<stunum<<"\t"<<remain<<"\t"<<endl;
 }

 class Gra:public Stu
 {
 private:
     float wage;

 public:
     Gra(float _remain,int num,const char *_name,float _wage):Stu(_remain,num,_name),wage(_wage){ }
     void showmoney();
     void isme(float a);
     void showinfo();
     const char *Getname(){return name;}
     bool operator >(Card *c);
 };
 bool Gra::operator >(Card *c)
 {
 if(remain>c->Getremain())
 return true;
 else
 return
     false;
 }
 void Gra::showmoney()
 {}
 void Gra::isme(float a)
 {
     remain = remain-a;

 }
 void Gra::showinfo()
 {
     cout<<name<<"\t"<<stunum<<"\t"<<remain<<"\t"<<wage<<"\t"<<endl;
 }
 class Employees :public Card
 {
 private:
     int wonum;
     const char* ename;
 public:
     Employees( float _remain,int _wonum,const char* _ename):Card(_remain),wonum(_wonum),ename(_ename){}
     void showmoney();
     void isme(float a);
     void showinfo();
     const char *Getname(){return ename;}
     bool operator >(Card *c);
 };
 bool Employees::operator >(Card *c)
 {
 if(remain>c->Getremain())
 return true;
 else
 return
     false;
 }
 void Employees::showmoney()
 {}
 void Employees::isme(float a)
 {
     remain = remain-a;

 }
 void Employees::showinfo()
 {
     cout<<ename<<"\t"<<wonum<<"\t"<<remain<<"\t"<<endl;
 }

 class Canteen
 {
 private:
     const char* menu;
     float price;
 public:
     Canteen(const char* _menu,float _price):menu(_menu),price(_price){}
     void showmenu();
     const char *Getmenu(){return menu;}
     float getprice(){return price;}
 };
 void Canteen::showmenu()
 {
 cout<<menu<<"\t"<<price<<"\t"<<endl;
 }
 int main()
 {
 float tmp = ;
 float tmp1 = ;
 int i,flag1,flag2,flag3;
 char pname[];
 char foodbuf[];
 Canteen c1("fish",10.0);
 Canteen c2("leek",8.5);
 Canteen c3("celery",7.2);
 Canteen c4("cole",5.8);
 Canteen c5("buds",6.9);
 Canteen *p1[]={&c1,&c2,&c3,&c4,&c5};
 Stu s(150.0,,"timi");
 Stu s1(200.0,,"tom");
 Gra g(180.0,,"lucy",700.0);
 Gra g1(200.0,,"jay",700.0);
 Employees e(190.0,,"jimi");
 Card *p[] = {&s,&s1,&g,&g1,&e};
 cout<<"people infomation:\n"<<endl;
 cout<<"NO.\t"<<"name\t"<<"num\t"<<"remain\t"<<"wage\t"<<endl;
 for(i=;i<;i++)
 {
 cout<<i<<"\t";
 p[i]->showinfo();
 }

 cout<<"input name who is you:"<<endl;
 char *cp;
 cin>>pname; cout<<endl;

 for(i=;i<;i++)
 {
     if(!strncmp(pname,p[i]->Getname(),strlen(pname)-))
     {
         cout<<"NO.\t"<<"name\t"<<"num\t"<<"remain\t"<<"wage\t"<<endl;
         cout<<i<<"\t";
         p[i]->showinfo();
         flag1 = i;
         break;
     }

 }

 while()
 {
     cout<<"1: list\t\t2: take your order\t3:show max and min\t0:quit\t"<<endl;
     cout<<"please input your select:"<<endl;
     int select;
     cin>>select;
     switch(select)
     {
         case : exit();
         case :{
                     cout<<"NO.\t"<<"food\t"<<"price\t"<<endl;
                     for(i=;i<;i++)
                     {
                         cout<<i<<"\t";
                         p1[i]->showmenu();

                     }
                     break;
             }
         case :{
                 cout<<"NO.\t"<<"food\t"<<"price\t"<<endl;
                     for(i=;i<;i++)
                     {
                         //cout<<i<<"\t";
                         p1[i]->showmenu();

                     }
                 cout<<"please input which do you like:"<<endl;
                 cin>>foodbuf;
                 for(i=;i<;i++)
                 {//cout<<"hello"<<endl;
                     if(!strncmp(foodbuf,p1[i]->Getmenu(),strlen(foodbuf)-))
                     {    

                         //cout<<"hello"<<endl;
                         p[flag1]->isme(p1[i]->getprice());
                         cout<<"remaining:"<<p[flag1]->Getremain()<<endl;
                     }

                 }
                     for(i=;i<;i++)
                     {

                         //cout<<"hello\n";
                         if(tmp < p[i]->Getremain())
                         {
                             tmp = p[i]->Getremain();
                             flag2 = i;
                         }
                     }

                     for(i=;i<;i++)
                     {
                                 if(tmp1>p[i]->Getremain())
                                 {tmp1 = p[i]->Getremain();
                                 flag3 = i;}
                     }

                     cout<<"the max is:"<<endl;
                     p[flag2]->showinfo();
                     cout<<"the min is:"<<endl;
                     p[flag3]->showinfo();
                 break;
                 }
         case  :
                 {
                 Card *maxp = p[],*minp = p[];
                 for(i=;i<;i++)
                 {
                     if(p[i]>p[i+])
                     {
                     minp = p[i-];
                     cout<<i<<endl;
                     }
                 }
                 for(i=;i<;i++)
                 {
                 if(p[i+]>p[i])
                     {
                     maxp = p[i];
                     cout<<i-<<endl;
                     }
                 }
                 cout<<"the min remain is:"<<endl;
                 minp->showinfo();
                 cout<<"the max remain is:"<<endl;
                 maxp->showinfo();

                 break;
                 }

         default:{break;}
     }
     }
 }