操作符重载05--流操作符（Stream Operators）

测试类.h

   1: #pragma once

   2: #include 

   3: using namespace std;

   4:  

   5: /*流操作符重载

   6: 1. 流操作符为2元操作符，形式为  第一个参数 <<(>>) 第二个参数;

   7: 2. 使用友元friend的形式，友元可以访问任何权限的成员变量，运算结果返回引用是

   8:    为了可以写成这种形式os << pt1 << pt2，如果不返回则只能写成os << pt1;

   9: */

  10: class TRectangle

  11: {

  12:     friend ostream& operator<<(ostream& Ostr, const TRectangle& Rect);

  13:     friend istream& operator>>(istream& Istr, TRectangle& Rect);

  14: public:

  15:     TRectangle(double L = 0.00, double H = 0.00);

  16:     TRectangle(const TRectangle& R);

  17:     ~TRectangle();

  18:  

  19:     //method

  20:     void setLength(const double L) { Length = L; }

  21:     double getLength() const { return Length; }

  22:     void setHeight(const double H) { Height = H; }

  23:     double getHeight() const { return Height; }

  24:     double Perimeter() const { return 2 * (Length + Height); }

  25:     double Area() const { return Length * Height; }

  26:  

  27: private:

  28:     double Length;

  29:     double Height;

  30: };

  31:  

测试类.cpp

   1: #include "StdAfx.h"

   2: #include "TRectangle.h"

   3:  

   4:  

   5: TRectangle::TRectangle(double L, double H) : 

   6: Length(L),

   7: Height(H)

   8: {

   9: }

  10:  

  11: TRectangle::TRectangle(const TRectangle& R) :

  12: Length(R.Length),

  13: Height(R.Height)

  14: {

  15: }

  16:  

  17: TRectangle::~TRectangle(void)

  18: {

  19: }

  20:  

  21: ostream& operator<<(ostream& Ostr, const TRectangle& R)

  22: {

  23:     Ostr << "长为：" << R.Length << "宽为：" << R.Height << endl;

  24:     return Ostr;

  25: }

  26:  

  27: istream& operator>>(istream& Istr, TRectangle& R)

  28: {

  29:     cout << "长: ";

  30:     Istr >> R.Length;

  31:     cout << "宽: ";

  32:     Istr >> R.Height;

  33:     return Istr;

  34: }

main

   1: // StreamOperators.cpp : 定义控制台应用程序的入口点。

   2: //

   3:  

   4: #include "stdafx.h"

   5: #include "TRectangle.h"

   6:  

   7:  

   8: int _tmain(int argc, _TCHAR* argv[])

   9: {

  10:     TRectangle Ra(10.5, 5.66), Rb(1, 2), Rc;

  11:     cout << Ra << Rb;

  12:     cin >> Rc;

  13:     cout << Rc;

  14:     return 0;

  15: }

  16:  

测试结果图

转载于:https://www.cnblogs.com/maogeblog/archive/2012/09/15/2686020.html