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()=0;
    virtual void isme(float a)=0;
    virtual void showinfo()=0;
    virtual const char* Getname()=0;
    //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<<"	"<<stunum<<"	"<<remain<<"	"<<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<<"	"<<stunum<<"	"<<remain<<"	"<<wage<<"	"<<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<<"	"<<wonum<<"	"<<remain<<"	"<<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<<"	"<<price<<"	"<<endl;
}
int main()
{
float tmp = 0;
float tmp1 = 160;
int i,flag1,flag2,flag3;
char pname[20];
char foodbuf[20];
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[5]={&c1,&c2,&c3,&c4,&c5};
Stu s(150.0,1001,"timi");
Stu s1(200.0,1002,"tom");
Gra g(180.0,2001,"lucy",700.0);
Gra g1(200.0,2002,"jay",700.0);
Employees e(190.0,3001,"jimi");
Card *p[5] = {&s,&s1,&g,&g1,&e};
cout<<"people infomation:
"<<endl;
cout<<"NO.	"<<"name	"<<"num	"<<"remain	"<<"wage	"<<endl;
for(i=0;i<5;i++)
{
cout<<i<<"	";
p[i]->showinfo();
}

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

for(i=0;i<5;i++)
{
    if(!strncmp(pname,p[i]->Getname(),strlen(pname)-1))
    {
        cout<<"NO.	"<<"name	"<<"num	"<<"remain	"<<"wage	"<<endl;
        cout<<i<<"	";
        p[i]->showinfo();
        flag1 = i;
        break;
    }

}

while(1)
{
    cout<<"1: list		2: take your order	3:show max and min	0:quit	"<<endl;
    cout<<"please input your select:"<<endl;
    int select;
    cin>>select;
    switch(select)
    {
        case 0: exit(0);
        case 1:{
                    cout<<"NO.	"<<"food	"<<"price	"<<endl;
                    for(i=0;i<5;i++)
                    {
                        cout<<i<<"	";
                        p1[i]->showmenu();
                        
                    }
                    break;
            }
        case 2:{
                cout<<"NO.	"<<"food	"<<"price	"<<endl;
                    for(i=0;i<5;i++)
                    {
                        //cout<<i<<"	";
                        p1[i]->showmenu();
                        
                    }
                cout<<"please input which do you like:"<<endl;
                cin>>foodbuf;
                for(i=0;i<5;i++)
                {//cout<<"hello"<<endl;
                    if(!strncmp(foodbuf,p1[i]->Getmenu(),strlen(foodbuf)-1))
                    {    
                        
                        //cout<<"hello"<<endl;
                        p[flag1]->isme(p1[i]->getprice());
                        cout<<"remaining:"<<p[flag1]->Getremain()<<endl;
                    }
                
                }
                    for(i=0;i<5;i++)
                    {
                        
                        //cout<<"hello
";
                        if(tmp < p[i]->Getremain())
                        {
                            tmp = p[i]->Getremain();
                            flag2 = i;
                        }
                    }
                    
                    for(i=0;i<5;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 3 :
                {    
                Card *maxp = p[0],*minp = p[0];
                for(i=0;i<4;i++)
                {
                    if(p[i]>p[i+1])
                    {
                    minp = p[i-1];
                    cout<<i<<endl;
                    }
                }
                for(i=0;i<4;i++)
                {
                if(p[i+1]>p[i])
                    {
                    maxp = p[i];
                    cout<<i-1<<endl;
                    }
                }
                cout<<"the min remain is:"<<endl;
                minp->showinfo();
                cout<<"the max remain is:"<<endl;
                maxp->showinfo();
                
                break;
                }
                    
        default:{break;}
    }
    }
}