main.cpp

来自「C++ Source code from a tutorial」· C++ 代码 · 共 79 行

#include <iostream>
#include <stdlib.h>
#include <string>

using namespace std;

class Cat {
public:
    string name;
};

class Dog {
public:
    string name;
};

class Human {
public:
    string name;
};

class Door {
private:
    int HowManyInside;
public:
    void Start();
    void GoThrough(Cat *acat);
    void GoThrough(Dog *adog);
    void GoThrough(Human *ahuman);
};

void Door::Start() {
    HowManyInside = 0;
}

void Door::GoThrough(Cat *somebody) {
    cout << "Welcome, " << somebody->name << endl;
    cout << "A cat just entered!" << endl;
    HowManyInside++;
}

void Door::GoThrough(Dog *somebody) {
    cout << "Welcome, " << somebody->name << endl;
    cout << "A dog just entered!" << endl;
    HowManyInside++;
}

void Door::GoThrough(Human *somebody) {
    cout << "Welcome, " << somebody->name << endl;
    cout << "A human just entered!" << endl;
    HowManyInside++;
}

int main(int argc, char *argv[])
{
    Door entrance;
    entrance.Start();
    
    Cat *SneekyGirl = new Cat;
    SneekyGirl->name = "Sneeky Girl";
    
    Dog *LittleGeorge = new Dog;
    LittleGeorge->name = "Little George";
    
    Human *me = new Human;
    me->name = "Jeff";
    
    entrance.GoThrough(SneekyGirl);
    entrance.GoThrough(LittleGeorge);
    entrance.GoThrough(me);
    
    delete SneekyGirl;
    delete LittleGeorge;
    delete me;
    
    system("PAUSE");	
    return 0;
}