第九周任务一（定义Complex类中的<<和>>运算符的重载，实现输入和输出）

/* (程序头部注释开始) * 程序的版权和版本声明部分 * Copyright (c) 2011, 烟台大学计算机学院学生  * All rights reserved. * 文件名称：  Complex.cpp                             * 作    者：   计114-4 冯珍珍     * 完成日期：    2012  年  4 月  17  日 * 版 本 号：       ly--w  * 对任务及求解方法的描述部分 * 输入描述： 实现复数类中的运算符重载 * 问题描述：定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。             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。 * 程序输出： +、-、*、/，对复数运算后的结果。 * 程序头部的注释结束 */  #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);      friend istream& operator >> (istream&, Complex&);      friend ostream& operator << (ostream&, Complex&);  private:      double real;      double imag;  };  //下面定义成员函数   Complex Complex::operator+ (Complex &c2)  {      return Complex(this->real + c2.real, this->imag + c2.imag);  }  Complex Complex::operator- (Complex &c2)  {      return Complex(this->real - c2.real, this->imag - c2.imag);  }  Complex Complex::operator* (Complex &c2)  {      Complex c;            c.real = real*c2.real - imag*c2.imag;      c.imag = real*c2.imag + imag*c2.real;            return c;  }  Complex Complex::operator/ (Complex &c2)  {      Complex c;            c.real = (real*c2.real + imag*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);      c.imag = (-real*c2.imag + imag*c2.real)/(c2.real*c2.real + c2.imag*c2.imag);            return c;  }  istream& operator >> (istream& input, Complex& c)  {      cout << "请输入复数的实部和虚部的数字：" << endl;      input >> c.real >> c.imag;        return input;  }  ostream& operator << (ostream& output, Complex& c)  {      output << "(" << c.real << "," << c.imag << ")";        return output;  }    int main()  {      Complex c1, c2, c3;        cin >> c1 >> c2;        cout << "c1=" << c1 << endl;      cout << "c2=" << c2 << endl;        c3 = c1 + c2;      cout << "c1+c2=" << c3 << endl;        c3 = c1 - c2;      cout << "c1-c2=" << c3 << endl;        c3 = c1 * c2;      cout << "c1*c2=" << c3 << endl;        c3 = c1 / c2;      cout << "c1/c2=" << c3 << endl;        system("pause");      return 0;  }  

/* 定义了<< >> 运算的重载。使得程序读起来更加的符合大多人得想法。 读起来更加容易一些。 */