9-1 複數類中的運算子多載

/* (程式頭部注釋開始)

* 程式的著作權和版本聲明部分

* Copyright (c) 2011, 煙台大學電腦學院學生

* All rights reserved.

* 檔案名稱： 實現複數類中的運算子多載

* 作 者： 張傳新

* 完成日期： 2012 年04 月14日

* 版 本 號：1.0

* 對任務及求解方法的描述部分

* 輸入描述：

* 問題描述：定義一個複數類重載運算子+、-、*、/，使之能用於複數的加減乘除。

* 程式輸出：

* 程式頭部的注釋結束

*/

#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 ostream& operator << (ostream&,Complex&);//聲明重載運算子“<<”函數private:double real;double imag;};//下面定義成員函數Complex Complex::operator + (Complex &c2) { return Complex(real + c2.real,imag + c2.imag); }Complex Complex::operator - (Complex &c2) { return Complex(real - c2.real,imag - c2.imag); }Complex Complex::operator * (Complex &c2) { return Complex(real * c2.real - imag * c2.imag,imag * c2.real + real * c2.imag); }Complex Complex::operator / (Complex &c2) { return Complex((real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag),     (imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag));   }ostream& operator << (ostream& output,Complex& c)//定義重載運算子“<<”函數{    output << "(" << c.real << "," << c.imag << "i)" << endl;return output;} void main() { Complex c1(3,4),c2(5,-10),c3; cout << "c1 = ";       cout << c1;       cout << "c2 = ";       cout << c2;   c3 = c1 + c2; cout << "c1 + c2 = "; cout << c3; c3 = c1 - c2; cout << "c1 - c2 = "; cout << c3; c3 = c1 * c2;  cout << "c1 * c2 = "; cout << c3; c3 = c1 / c2; cout << "c1 / c2 = "; cout << c3; system("pause"); } 

運行結果：

感言：so easy!!!