C++第四章

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（1）#include<iostream>  
using namespace std;  
class complex{  
    public:  
        complex(){real=0;imag=0;}  
        complex(double r,double i){real=r;imag=i;}  
        void display();  
        double real;  
        double imag;          
};  
complex operator +(complex &c1,complex &c2)  
{  
    complex c;  
    c.real=c1.real+c2.real;  
    c.imag=c1.imag+c2.imag;  
    return c;  
}  
void complex::display()  
{  
    cout<<"("<<real<<","<<imag<<"i)"<<endl;  
}  
int main()  
{  
    complex c1(3,4),c2(1,3),c;  
    operator +(c1,c2);  
    c=c1+c2;  
    c.display();  
    return 0;  
}  

2）#include<iostream>
using namespace std;
class complex{
 public:
  complex(){real=0;imag=0;}
  complex(double r,double i){real=r;imag=i;}
  complex operator +(complex &c2);
  complex operator -(complex &c2);
  complex operator *(complex &c2);
  complex operator /(complex &c2);
  void display();
 private:
     double real;
  double imag;  
};
complex complex:: operator +(complex &c2)
{
 complex c;
 c.real=real+c2.real;
 c.imag=imag+c2.imag;
 return c;
}
complex complex::operator -(complex &c2)
{
 complex c;
 c.real=real-c2.real;
 c.imag=imag-c2.imag;
 return c;
}
complex complex::operator *(complex &c2)
{
 complex c;
 c.real=real*c2.real;
 c.imag=imag*c2.imag;
 return c;
}
complex complex::operator /(complex &c2)
{
 complex c;
 c.real=real/c2.real;
 c.imag=imag/c2.imag;
 return c;
}
void complex::display()
{
 cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
int main()
{
 complex c1(3,4),c2(1,3),c;
 c=c1+c2;
 c.display();
 c=c1-c2;
 c.display();
 c=c1*c2;
 c.display();
 c=c1/c2;
 c.display();
 return 0;
}
 
 
（3）#include<iostream>
using namespace std;
class complex{
 public:
     complex(){real=0;imag=0;}
     complex(double r){real=r;imag=0;}
     complex(double r,double i){real=r;imag=i;}
     friend complex operator +(complex c1,complex c2);
     //operator double(){return real;}
     void display();
 private:
  double real;
  double imag;
};
complex operator +(complex c1,complex c2)
{
 complex c;
 c.real=c1.real+c2.real;
 c.imag=c1.imag+c2.imag;
 return c;
}
void complex::display()
{
 cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
int main()
{
 complex c1(3,4),c2(1,3),c;
 double i=2.5;
 c=c1+c2;
 c.display();
 c=c1+i;
 c.display();
 c=i+c1;
 c.display(); 
}
（4）#include <iostream.h>  
class Matrix{  
public:  
    Matrix();  
    friend Matrix operator +(Matrix &,Matrix &);  
    void input();  
    void display();  
private:  
    int mat[2][3];  
};  
Matrix::Matrix()  
{  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
         mat[i][j]=0;  
}  
Matrix operator +(Matrix &a,Matrix &b)  
{  
 Matrix c;  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
         c.mat[i][j]=a.mat[i][j]+b.mat[i][j];  
     return c;  
}  
void Matrix::input()  
{  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
         cin>>mat[i][j];  
}  
void Matrix::display()  
{  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
     {cout<<mat[i][j]<<" ";  
     cout<<endl;}  
}  
int main()  
{   Matrix a,b,c;  
 a.input();  
 b.input();  
 c=a+b;  
 c.display();  
 return 0;  
}  
（5）
include <iostream.h>  
class Matrix{  
public:   
    Matrix();  
    friend Matrix operator +(Matrix &,Matrix &);  
    friend istream& operator >>(istream &,Matrix &);  
    friend ostream& operator <<(ostream &,Matrix &);  
private:  
    int mat[2][3];  
};  
Matrix::Matrix()  
{  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
         mat[i][j]=0;  
}  
Matrix operator +(Matrix &a,Matrix &b)  
{  
 Matrix c;  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
         c.mat[i][j]=a.mat[i][j]+b.mat[i][j];  
     return c;  
}  
istream & operator >>(istream & in,Matrix &c)  
{  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
         in>>c.mat[i][j];  
     return in;  
}  
ostream & operator <<(ostream & out,Matrix &c)  
{  
 for(int i=0;i<2;i++)  
     for(int j=0;j<3;j++)  
     {  
     out<<c.mat[i][j]<<" ";  
     cout<<endl;  
     }  
     return out;  
}  
int main()  
{  
 Matrix a,b,c;  
 cin>>a;  
 cout<<a;  
 cin>>b;  
 cout<<b;  
 c=a+b;  
 cout<<c;  
 return 0;  
}  
 
（6）
include<iostream>
using namespace std;
class complex{
 public:
     complex(){real=0;imag=0;}
     complex(double r){real=r;imag=0;}
     complex(double r,double i){real=r;imag=i;}
     //friend complex operator +(complex c1,complex c2);
     operator double(){return real;}
     void display();
  double real;
  double imag;
};
void complex::display()
{
 cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
int main()
{
 complex c1(3,4),c;double dl;
 double i=2.5;
 dl=c1+i;
 cout<<dl<<endl;
 c.real=dl;
 c.imag=c1.imag;
 c.display();
}
 
（7）
#include<iostream>
#include<string>
#include<cstring>
using namespace std;
class Student
{
public:
 int    num;
 char name[10];
 char   sex;
 Student(int n, char nam[],char s):num(n),sex(s){
  strncpy(name, nam,10);
 }
 void display();
};
class Teacher
{
public:
    Teacher(Student &s):num(s.num),sex(s.sex)
 {
  //num=s.num;
  strcpy(name,s.name);
  //sex=s.sex;
 }
    void display();
private:
    int num;
    char name[10];
    char sex;
};
void Student::display()
{
 cout<<"nun:"<<num<<endl; 
 cout<<"name:"<<name<<endl;
 cout<<"sex:"<<sex<<endl;
}
void Teacher::display()
{
 cout<<"nun:"<<num<<endl;
 cout<<"name:"<<name<<endl;
 cout<<"sex:"<<sex<<endl;
}
int main()
{
 Student s(10,"zhangsan",'m') ;
 s.display();
 Teacher t1(s);
 t1.display();
 return 0;
}
 

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