操作符重载03--和/差/积/商赋值运算符（Sum Assignment Operator）

叁歲伎倆 2021-12-15 13:13 203阅读 0赞

\+=、-=、\*=、/=操作符重载。

测试类.h

1: #pragma once

3: /*和/差/积/商赋值操作符重载

4: 1. 为2元操作符

5: 2. 一般返回类的引用，其实作为成员函数不返回值也可以，就是this本身

6: 3. 注意要满足运算符有意义，尤其是除法

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: 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:     TRectangle& operator=(const TRectangle& Rect);

28:

29:     TRectangle& operator+=(const TRectangle& Rect);

30:     TRectangle& operator-=(const TRectangle& Rect);

31:     TRectangle& operator*=(const TRectangle& Rect);

32:     TRectangle& operator/=(const TRectangle& Rect);

33: private:

34:     double Length;

35:     double Height;

36: };

37:

测试类.cpp

1: #include "StdAfx.h"

2: #include "TRectangle.h"

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: TRectangle& TRectangle::operator+=(const TRectangle& R)

71: {

72:     Length += R.Length;

73:     Height += R.Height;

74:

75:     return *this;

76: }

77:

78: TRectangle& TRectangle::operator-=(const TRectangle& R)

79: {

80:     Length -= R.Length;

81:     Height -= R.Height;

82:

83:     return *this;

84: }

85:

86: TRectangle& TRectangle::operator*=(const TRectangle& R)

87: {

88:     Length *= R.Length;

89:     Height *= R.Height;

90:

91:     return *this;

92: }

93:

94: TRectangle& TRectangle::operator/=(const TRectangle& R)

95: {

96:     if( R.Length == 0 )

97:         Length = 0;

98:     else

99:         Length /= R.Length;

100:

101:     if( R.Height == 0 )

102:         Height = 0;

103:     else

104:         Height /= R.Height;

105:

106:     return *this;

107: }

main

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

2: //

4: #include "stdafx.h"

5: #include <iostream>

6: #include "TRectangle.h"

7: using namespace std;

9: void ShowResult(TRectangle& R, char* str = "")

10: {

11:     cout << str << "  Length : " << R.getLength() << " Height : " << R.getHeight() << endl;

12: }

13:

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

15: {

16:     TRectangle Ra, Rb, Rc;

17:     Ra.setLength(20);

18:     Ra.setHeight(10);

19:

20:     Rb.setLength(40);

21:     Rb.setHeight(20);

22:

23:     ShowResult(Ra, "Ra");

24:     ShowResult(Rb, "Rb");

25:

26:     Rc = Ra;

27:     ShowResult(Rc, "Rc Initialize");

28:

29:     Rc += Rb;

30:     ShowResult(Rc, "Rc += Rb");

31:

32:     Rc -= Rb;

33:     ShowResult(Rc, "Rc -= Rb");

34:

35:     Rc *= Rb;

36:     ShowResult(Rc, "Rc *= Rb");

37:

38:     Rc /= Rb;

39:     ShowResult(Rc, "Rc /= Rb");

40:

41:     return 0;

42: }

43:

测试结果图

[![image][]][image 1]

转载于:https://www.cnblogs.com/maogeblog/archive/2012/09/13/2683233.html

[image]: /images/20211214/5cf0234856484b25a5c31bd7c831be37.png
[image 1]: http://images.cnblogs.com/cnblogs_com/maogeblog/201209/201209131400333824.png

操作符重载03--和/差/积/商赋值运算符（Sum Assignment Operator）

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