C++习题 复数类--重载运算符2+

Description

定义一个复数类Complex，重载运算符“+”，使之能用于复数的加法运算。参加运算的两个运算量可以都是类对象，也可以其中有一个是整数，顺序任意。例如，c1+c2,i+c1,c1+i均合法(设i为整数,c1,c2为复数)。编写程序，分别求两个复数之和、整数和复数之和。

Input

两个复数

一个复数和一个整数

一个整数和一个复数

Output

两个复数之和、复数和整数之和，整数和复数之和。

Sample Input

3 4 5 -10
3 4 5
5 3 4

Sample Output

c1+c2=(8.00,-6.00i)
c1+i=(8.00,4.00i)
i+c1=(8.00,4.00i)
[code]#include <iostream>

#include <iomanip>

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+(int &i);

friend Complex operator+(int&,Complex &);

void display();

private:

double real;

double imag;

};

Complex Complex:: operator+(Complex &c2)
{return Complex(real+c2.real,imag+c2.imag);}

Complex Complex:: operator+(int &i)
{return Complex(real+i,imag);}
Complex operator+(int&i,Complex &c)
{return Complex(i+c.real,c.imag);}
void Complex::display()
{   cout<<"("<<real<<","<<imag<<"i)"<<endl;}

int main()

{

double real,imag;

cin>>real>>imag;

Complex c1(real,imag);

cin>>real>>imag;

Complex c2(real,imag);

cout<<setiosflags(ios::fixed);

cout<<setprecision(2);

Complex c3=c1+c2;

cout<<"c1+c2=";

c3.display();

int i;

cin>>real>>imag;

cin>>i;

c3=Complex(real,imag)+i;

cout<<"c1+i=";

c3.display();

cin>>i;

cin>>real>>imag;

c1=Complex(real,imag);

c3=i+c1;

cout<<"i+c1=";

c3.display();

return 0;

}

[/code]