测试类.h
1: #pragma once
2:
3: /*布尔（逻辑）操作符重载
4: 1. 布尔操作符为2元操作符
5: 2. 一般使用友元friend的形式，友元可以访问任何权限的成员变量，如果使用成员函数的形式，
6: 则只带一个参数，还有一个为本身，友元带2个参数
7: */
8: class TRectangle
9: {
10: friend TRectangle operator+(const TRectangle& x, const TRectangle& y);
11: friend TRectangle operator-(const TRectangle& x, const TRectangle& y);
12: friend TRectangle operator*(const TRectangle& x, const TRectangle& y);
13: friend TRectangle operator/(const TRectangle& x, const TRectangle& y);
14:
15: //boolean operators
16: friend bool operator==(const TRectangle& x, const TRectangle& y);
17: friend bool operator!=(const TRectangle& x, const TRectangle& y);
18: friend bool operator<(const TRectangle& x, const TRectangle& y);
19: friend bool operator<=(const TRectangle& x, const TRectangle& y);
20: friend bool operator>(const TRectangle& x, const TRectangle& y);
21: friend bool operator>=(const TRectangle& x, const TRectangle& y);
22: public:
23: TRectangle(double L = 0.00, double H = 0.00);
24: TRectangle(const TRectangle& R);
25: ~TRectangle();
26:
27: //method
28: void setLength(const double L) { Length = L; }
29: double getLength() const { return Length; }
30: void setHeight(const double H) { Height = H; }
31: double getHeight() const { return Height; }
32: double Perimeter() const { return 2 * (Length + Height); }
33: double Area() const { return Length * Height; }
34:
35: TRectangle& operator=(const TRectangle& Rect);
36: private:
37: double Length;
38: double Height;
39: };
40:
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: TRectangle& TRectangle::operator=(const TRectangle& Rect)
22: {
23: Length = Rect.Length;
24: Height = Rect.Height;
25: return *this;
26: }
27:
28: TRectangle operator+(const TRectangle& x, const TRectangle& y)
29: {
30: TRectangle R;
31: R.Length = x.Length + y.Length;
32: R.Height = x.Height + y.Height;
33: return R;
34: }
35:
36: TRectangle operator-(const TRectangle& x, const TRectangle& y)
37: {
38: TRectangle R;
39: R.Length = x.Length - y.Length;
40: R.Height = x.Height - y.Height;
41:
42: return R;
43: }
44:
45: TRectangle operator*(const TRectangle& x, const TRectangle& y)
46: {
47: TRectangle R;
48: R.Length = x.Length * y.Length;
49: R.Height = x.Height * y.Height;
50:
51: return R;
52: }
53:
54: TRectangle operator/(const TRectangle& x, const TRectangle& y)
55: {
56: TRectangle R;
57: if( y.Length == 0 ) // 避免分母为0
58: R.Length = 0;
59: else
60: R.Length = x.Length / y.Length;
61:
62: if( y.Height == 0 )
63: R.Height = 0;
64: else
65: R.Height = x.Height / y.Height;
66:
67: return R;
68: }
69:
70: bool operator==(const TRectangle& x, const TRectangle& y)
71: {
72: if( x.Area() == y.Area() )
73: return true;
74: return false;
75: }
76:
77: bool operator!=(const TRectangle& x, const TRectangle& y)
78: {
79: if( x.Area() != y.Area() )
80: return true;
81: return false;
82: }
83:
84: bool operator<(const TRectangle& x, const TRectangle& y)
85: {
86: if( x.Area() < y.Area() )
87: return true;
88: return false;
89: }
90:
91: bool operator<=(const TRectangle& x, const TRectangle& y)
92: {
93: if( x.Area() <= y.Area() )
94: return true;
95: return false;
96: }
97:
98: bool operator>(const TRectangle& x, const TRectangle& y)
99: {
100: if( x.Area() > y.Area() )
101: return true;
102: return false;
103: }
104:
105: bool operator>=(const TRectangle& x, const TRectangle& y)
106: {
107: if( x.Area() >= y.Area() )
108: return true;
109: return false;
110: }
main
1: // BooleanOperators.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: #include
7: using namespace std;
8:
9: int _tmain(int argc, _TCHAR* argv[])
10: {
11: TRectangle Ra(10, 20), Rb(11,21);
12: if(Ra > Rb)
13: cout << "Ra 大于 Rb" << endl;
14: else if(Ra == Rb)
15: cout << "Ra 等于 Rb" << endl;
16: else
17: cout << "Ra 小于 Rb" << endl;
18: return 0;
19: }
20:
测试结果图
