9-1Complex類定義類中的運算子多載

/** Copyright (c) 2013, 煙台大學電腦學院* All rights reserved.* 檔案名稱:text.cpp* 作者：胡穎* 完成日期:2013年4月26日* 版本號碼：v1.0** 輸入描述：無* 問題描述:利用函數實現複數的加、減、乘、除、輸入、輸出、運算* 程式輸出：輸出複數的運算結果* 問題分析：* 演算法設計：略*/#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&);friend istream& operator>>(istream&,Complex&);private:double real;double imag;};ostream& operator<<(ostream&output,Complex&c){    output<<"("<<c.real<<"+"<<c.imag<<"i)";    return output;}istream& operator>>(istream&input,Complex&c){  cout<<"input real part ang imaginary part of complex number:";   input>>c.real>>c.imag;   return input;}Complex Complex::operator+(Complex &c2){    Complex c;    c.real=real+c2.real;    c.imag=imag+c2.imag;    return c;}Complex Complex::operator-(Complex &c2){    Complex c;    c.real=real-c2.real;    c.imag=imag-c2.imag;    return c;}Complex Complex::operator*(Complex &c2){    Complex c;    c.real=(real*c2.real-imag*c2.imag);    c.imag=(imag*c2.real+real*c2.imag);    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=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    return c;}//下面定義用於測試的main()函數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;return 0;}

運行結果：

心得體會：輸入輸出資料流的重載只能用友元函數