基本运算符的重载(类操作符)
#include<iostream>
using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r; imag=i;}
Complex operator+(const Complex &c2);
Complex operator-(const Complex &c2);
Complex operator*(const Complex &c2);
Complex operator/(const Complex &c2);
void display();
private:
double real;
double imag;
};
Complex Complex::operator+(const Complex &c2)
{
Complex result;
result.real=real+c2.real;
result.imag=imag+c2.imag;
return result;
}
Complex Complex::operator-(const Complex &c2)
{
Complex result;
result.real=real+c2.real;
result.imag=imag+c2.imag;
return result;
}
Complex Complex::operator*(const Complex &c2)
{
Complex result;
result.real=real*c2.real-imag*c2.imag;
result.imag=imag*c2.real+real*c2.imag;
return result;
}
Complex Complex::operator/(const Complex &c2)
{
Complex result;
double a,b,c;
a=real*c2.real+imag*c2.imag;
b=imag*c2.real-real*c2.imag;
c=c2.real*c2.real+c2.imag*c2.imag;
result.real=a/c;
result.imag=b/c;
// result.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
// result.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
return result;
}
void Complex::display()
{
cout<<real;
if(imag>0)
cout<<"+"<<imag<<"i"<<endl;
if(imag<0)
cout<<imag<<"i"<<endl;
}
int main()
{
Complex c1(3,4),c2(5,-10),c3;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
return 0;
}
运行结果:
基本运算符的重载(全局操作符)
#include<iostream>
using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r; imag=i;}
friend Complex operator+(const Complex &c1,const Complex &c2);
friend Complex operator-(const Complex &c1,const Complex &c2);
friend Complex operator*(const Complex &c1,const Complex &c2);
friend Complex operator/(const Complex &c1,const Complex &c2);
void display();
private:
double real;
double imag;
};
Complex operator+(const Complex &c1,const Complex &c2)
{
Complex result;
result.real=c1.real+c2.real;
result.imag=c1.imag+c2.imag;
return result;
}
Complex operator-(const Complex &c1,const Complex &c2)
{
Complex result;
result.real=c1.real+c2.real;
result.imag=c1.imag+c2.imag;
return result;
}
Complex operator*(const Complex &c1,const Complex &c2)
{
Complex result;
result.real=c1.real*c2.real-c1.imag*c2.imag;
result.imag=c1.imag*c2.real+c1.real*c2.imag;
return result;
}
Complex operator/(const Complex &c1,const Complex &c2)
{
Complex result;
double a,b,c;
a=c1.real*c2.real+c1.imag*c2.imag;
b=c1.imag*c2.real-c1.real*c2.imag;
c=c2.real*c2.real+c2.imag*c2.imag;
result.real=a/c;
result.imag=b/c;
return result;
}
void Complex::display()
{
cout<<real;
if(imag>0)
cout<<"+"<<imag<<"i"<<endl;
if(imag<0)
cout<<imag<<"i"<<endl;
}
int main()
{
Complex c1(3,4),c2(5,-10),c3;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
return 0;
}
运行结果:
在没有接触过这个概念的时候自己还是不好理解他,但是在最后实际操作之后还是十分简单。在加了frien声明的时候在vc++6.0的编译环境中,显示的并没有成功。出现了错误——
fatal error C1001: INTERNAL COMPILER ERROR
(compiler file 'msc1.cpp', line 1786)
Please choose the Technical Support command on the Visual C++
Help menu, or open the Technical Support help file for more information
(compiler file 'msc1.cpp', line 1786)
Please choose the Technical Support command on the Visual C++
Help menu, or open the Technical Support help file for more information
但将编译环境改成vs2012之后就显示编译成功。
之后为了在书中查到,在VC++6.0当中并没有实现完全的C++机制,它所提供的不带后缀.h的头文件不支持将C++类库中的对象(ostream和istream)作为友元函数的参数,但是VC++6.0所提供的老形式的带后缀.h的头文件支持这样的功能。