2015-第9周项目1-复数类中的运算符重载（续）

【项目1-复数类中的运算符重载（续）】

在复数类中的运算符重载基础上

（1）再定义一目运算符 -，-c相当于0-c。

（2）定义Complex类中的<<和>>运算符的重载，实现输入和输出，改造原程序中对运算结果显示方式，使程序读起来更自然。

#include <iostream>
using namespace std;
class Complex
{
public:
Complex()
{
real=0;
imag=0;
}
Complex(double r,double i)
{
real=r;
imag=i;
}
Complex operator-();
friend Complex operator+(Complex &c1, Complex &c2);
friend Complex operator+(double d1, Complex &c2);
friend Complex operator+(Complex &c1, double d2);
friend Complex operator-(Complex &c1, Complex &c2);
friend Complex operator-(double d1, Complex &c2);
friend Complex operator-(Complex &c1, double d2);
friend Complex operator*(Complex &c1, Complex &c2);
friend Complex operator*(double d1, Complex &c2);
friend Complex operator*(Complex &c1, double d2);
friend Complex operator/(Complex &c1, Complex &c2);
friend Complex operator/(double d1, Complex &c2);
friend Complex operator/(Complex &c1, double d2);
friend ostream& operator << (ostream& output,const Complex &c);
friend istream& operator >> (istream& input, Complex &c);

private:
double real;
double imag;
};
ostream &operator<<(ostream &output , const Complex &c)
{
output<<"("<<c.real;
if(c.imag>=0)
output<<"+";
output<<c.imag<<"i)";
return output;
}
istream &operator>>(istream &input,Complex &c)
{
int a,b;
char sign,i;
do
{
cout<<"input a complex number(a+bi或a-bi):";
input>>a>>sign>>b>>i;
}
while(!((sign=='+'||sign=='-')&&i=='i'));
c.real=a;
c.imag=(sign=='+')?b:-b;
return input;
}
Complex Complex::operator-()
{
return(0-*this);
}
Complex operator+(Complex &c1, Complex &c2)
{
Complex c;
c.real=c1.real+c2.real;
c.imag=c1.imag+c2.imag;
return c;
}
Complex operator+(double d1, Complex &c2)
{
Complex c(d1,0);
return c+c2;
}
Complex operator+(Complex &c1, double d2)
{
Complex c(d2,0);
return c1+c;
}

Complex operator-(Complex &c1, Complex &c2)
{
Complex c;
c.real=c1.real-c2.real;
c.imag=c1.imag-c2.imag;
return c;
}
Complex operator-(double d1, Complex &c2)
{
Complex c(d1,0);
return c-c2;
}
Complex operator-(Complex &c1, double d2)
{
Complex c(d2,0);
return c1-c;
}

//复数相乘：(a+bi)(c+di)=(ac－bd)+(bc+ad)i.
Complex operator*(Complex &c1, Complex &c2)
{
Complex c;
c.real=c1.real*c2.real-c1.imag*c2.imag;
c.imag=c1.imag*c2.real+c1.real*c2.imag;
return c;
}
Complex operator*(double d1, Complex &c2)
{
Complex c(d1,0);
return c*c2;
}
Complex operator*(Complex &c1, double d2)
{
Complex c(d2,0);
return c1*c;
}

//复数相除：(a+bi)/(c+di)=(ac+bd)/(c^2+d^2) +(bc-ad)/(c^2+d^2)i
Complex operator/(Complex &c1, Complex &c2)
{
Complex c;
c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
return c;
}
Complex operator/(double d1, Complex &c2)
{
Complex c(d1,0);
return c/c2;
}
Complex operator/(Complex &c1, double d2)
{
Complex c(d2,0);
return c1/c;
}
int main()
{
Complex c1,c2,c3;
double d=11;
cout<<"c1: "<<endl;;
cin>>c1;
cout<<"c2: "<<endl;
cin>>c2;
cout<<"c1="<<c1<<endl;
cout<<"c2="<<c2<<endl;
cout<<"d="<<d<<endl;
//cout<<"-c1="<<(-c1);
c3=c1+c2;
cout<<"c1+c2="<<c3<<endl;
cout<<"c1+d="<<(c1+d)<<endl;
cout<<"d+c1="<<(d+c1)<<endl;
c3=c1-c2;
cout<<"c1-c2="<<c3<<endl;
cout<<"c1-d="<<(c1-d)<<endl;
cout<<"d-c1="<<(d-c1)<<endl;
c3=c1*c2;
cout<<"c1*c2="<<c3<<endl;
cout<<"c1*d="<<(c1*d)<<endl;
cout<<"d*c1="<<(d*c1)<<endl;
c3=c1/c2;
cout<<"c1/c2="<<c3<<endl;
cout<<"c1/d="<<(c1/d)<<endl;
cout<<"d/c1="<<(d/c1)<<endl;
return 0;
}
/*int main()
{
Complex c1(3,4),c2(5,-10),c3;
double d=11;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
cout<<"d="<<d<<endl<<endl;
cout<<"下面是重载运算符的计算结果: "<<endl;
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
cout<<"c1+d=";
(c1+d).display();
cout<<"d+c1=";
(d+c1).display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
cout<<"c1-d=";
(c1-d).display();
cout<<"d-c1=";
(d-c1).display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
cout<<"c1*d=";
(c1*d).display();
cout<<"d*c1=";
(d*c1).display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
cout<<"c1/d=";
(c1/d).display();
cout<<"d/c1=";
(d/c1).display();
return 0;
}*/