山东理工大学，C++

#include <iostream>
#include <cstdio>
using namespace std;class Point
{
public:Point(){x = y = 0;}void getpoint(){cin>>x>>y;}float getX(float);float getY(float);void Move(float, float);void show();
private:float x, y;
};void Point::Move(float a, float b)
{x = x+a;y = y+b;
}float Point::getX(float a)
{return x+a;
}float Point::getY(float b)
{return y+b;
}void Point::show()
{cout<<x<<" "<<y;
}class Rectangle:public Point
{
public:Rectangle(){w = h = 0;}void setdata(){getpoint();cin>>w>>h;if ( w <= 0 )w = 0;if ( h <= 0 )h = 0;}void display();float getW();float getH();
private:float w, h;
};float Rectangle::getW()
{return w;
}float Rectangle::getH()
{return h;
}void Rectangle::display()
{show();cout<<" "<<w<<" "<<h<<endl;
}int main()
{float m,n;Rectangle re;re.setdata();cin>>m>>n;re.Move(m,n);re.display();return 0;
}

5-2 派生类的构造函数

#include <iostream>
#include <cstdio>
using namespace std;class Person
{
protected:char name[105];char sex[105];int age;
public:Person(){cin>>name>>sex>>age;}
};class Employee:public Person
{
private:int basicsalary;int leavedays;
public:Employee(){cin>>basicsalary>>leavedays;}void show(){cout<<"name:"<<name<<endl;cout<<"age:"<<age<<endl;cout<<"sex:"<<sex<<endl;cout<<"basicSalary:"<<basicsalary<<endl;cout<<"leavedays:"<<leavedays<<endl;}
};int main()
{Employee e;e.show();return 0;
}

#include <iostream>
#include <cstdio>
using namespace std;class Person
{
protected:char name[105];char sex[105];int age;
public:Person(){cin>>name>>sex>>age;}
};class Employee:public Person
{
private:int basicsalary;int leavedays;
public:Employee(){cin>>basicsalary>>leavedays;}void show(){cout<<"name:"<<name<<endl;cout<<"age:"<<age<<endl;cout<<"sex:"<<sex<<endl;cout<<"basicSalary:"<<basicsalary<<endl;cout<<"leavedays:"<<leavedays<<endl;}
};class Manager:public Employee
{
private:float performance;
public:Manager(){cin>>performance;}void show1(){show();cout<<"performance:"<<performance<<endl;}
};int main()
{Manager e;e.show1();return 0;
}

6-1 多态性与虚函数

#include <cstring>
#include <iostream>
using namespace std;class Pet
{
public:virtual void Speak(){cout<<"How does a pet speak ?"<<endl;}
};class Dog:public Pet
{
public:virtual void Speak(){cout<<"wang!wang!"<<endl;}
};class Cat:public Pet
{
public:virtual void Speak(){cout<<"miao!miao!"<<endl;}
};int main()
{Pet h;h.Speak();Cat h2;h2.Speak();Dog h1;h1.Speak();return 0;
}

#include <cstring>
#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;class Pet
{
protected:char name[50];
public:void Scanf(char *s){strcpy( name, s );}virtual void Speak(){cout<<"How does a pet speak ?"<<endl;}
};class Dog:public Pet
{
public:virtual void Speak(){cout<<"I am a dog,My name is "<<name<<" My sound is wang!wang!"<<endl;}
};class Cat:public Pet
{
public:virtual void Speak(){cout<<"I am a cat,My name is "<<name<<" My sound is miao!miao!"<<endl;}
};int main()
{Pet h;h.Speak();Cat h2;h2.Scanf("Tom");h2.Speak();Dog h1;h1.Scanf("Snoppy");h1.Speak();
}