C#运算符重载

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C#运算符重载

2024-07-11 17:33| 来源: 网络整理| 查看: 265

1.什么是运算符重载

定义:(百科定义)就是把已经定义的、有一定功能的操作符进行重新定义,来完成更为细致具体的运算等功能。操作符重载可以将概括性的抽象操作符具体化,便于外部调用而无需知晓内部具体运算过程。

2.为什么需要运算符重载?

在C#中 ,内置的数据类型有:int、double等这些类型是预先在系统内定义好的,可以直接进行数值加减运算。例如:int i, j = 1; int sum=i+j;可以直接得到想要的和sum。

如果要比较一个类(结构)进行对象比较加、减等操作 该如何实现?例如一个类Box,有对象Box1和Box2,那么, 如何实现对象相加Box3 = Box1 + Box2?

这时,我们就要用到具有用户定义类型的运算符。重载运算符是具有特殊名称的功能,关键字operator后跟定义运算符的符号。 类似于任何其他函数定义,重载运算符具有返回类型和参数列表。

3.下面用三个案例,以逐步步进的方式解析一下 1 namespace operator_overload 2 { 3 class Program 4 { 5 static void Main(string[] args) 6 { 7 Box Box1 = new Box(); 8 Box Box2 = new Box(); 9 Box Box3 = new Box(); 10 11 double volume1,volume2 = 0.0; 12 13 Box1.setLength(60.0); 14 Box1.setBreadth(70.0); 15 Box1.setHeight(50.0); 16 17 Box2.setLength(121.0); 18 Box2.setBreadth(133.0); 19 Box2.setHeight(110.0); 20 21 volume1 = Box1.getVolume(); 22 Console.WriteLine("Volume of Box1 :{0}",volume1); 23 24 volume2 = Box2.getVolume(); 25 Console.WriteLine("Volume of Box1 :{0}", volume2); 26 27 28 } 29 } 30 31 class Box 32 { 33 private double length; 34 private double breadth; 35 private double height; 36 37 public double getVolume() 38 { 39 return length * breadth * height; 40 } 41 public void setLength(double len) 42 { 43 length = len; 44 } 45 public void setBreadth(double bre) 46 { 47 breadth = bre; 48 } 49 public void setHeight(double hei) 50 { 51 height = hei; 52 } 53 54 } 案例一

 

 

 案例一没有运用运算符重载,也没类或结构相加,可以正常求和;

1 namespace operator_overload 2 { 3 class Program 4 { 5 static void Main(string[] args) 6 { 7 Box Box1 = new Box(); 8 Box Box2 = new Box(); 9 Box Box3 = new Box(); 10 11 double volume1,volume2 = 0.0; 12 13 Box1.setLength(60.0); 14 Box1.setBreadth(70.0); 15 Box1.setHeight(50.0); 16 17 Box2.setLength(121.0); 18 Box2.setBreadth(133.0); 19 Box2.setHeight(110.0); 20 21 volume1 = Box1.getVolume(); 22 Console.WriteLine("Volume of Box1 :{0}",volume1); 23 24 volume2 = Box2.getVolume(); 25 Console.WriteLine("Volume of Box1 :{0}", volume2); 26 27 Box3 = Box1 + Box2; //类实例进行相加; 28 } 29 } 30 31 class Box 32 { 33 private double length; 34 private double breadth; 35 private double height; 36 37 public double getVolume() 38 { 39 return length * breadth * height; 40 } 41 public void setLength(double len) 42 { 43 length = len; 44 } 45 public void setBreadth(double bre) 46 { 47 breadth = bre; 48 } 49 public void setHeight(double hei) 50 { 51 height = hei; 52 } 53 54 55 } 56 } 57 } 案例二

案例二,增加了“Box3 = Box1 + Box2;”,但是没有相应的运算符代码进行支持,所以编译器显示如下提示

 

 

 错误    1    运算符“+”无法应用于“operator_overload.Box”和“operator_overload.Box”类型的操作数

1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace operator_overload 7 { 8 class Program 9 { 10 static void Main(string[] args) 11 { 12 Box Box1 = new Box(); 13 Box Box2 = new Box(); 14 Box Box3 = new Box(); 15 16 double volume,volume1,volume2 = 0.0; 17 18 Box1.setLength(60.0); 19 Box1.setBreadth(70.0); 20 Box1.setHeight(50.0); 21 22 Box2.setLength(121.0); 23 Box2.setBreadth(133.0); 24 Box2.setHeight(110.0); 25 26 volume1 = Box1.getVolume(); 27 Console.WriteLine("Volume of Box1 :{0}",volume1); 28 29 volume2 = Box2.getVolume(); 30 Console.WriteLine("Volume of Box1 :{0}", volume2); 31 32 Box3 = Box1 + Box2; 33 34 volume = Box3.getVolume(); 35 Console.WriteLine("Volume of Box3 :{0}", volume); 36 Console.ReadKey(); 37 } 38 } 39 40 class Box 41 { 42 private double length; 43 private double breadth; 44 private double height; 45 46 public double getVolume() 47 { 48 return length * breadth * height; 49 } 50 public void setLength(double len) 51 { 52 length = len; 53 } 54 public void setBreadth(double bre) 55 { 56 breadth = bre; 57 } 58 public void setHeight(double hei) 59 { 60 height = hei; 61 } 62 63 public static Box operator +(Box b, Box c) 64 { 65 Box box = new Box(); 66 box.length = b.length + c.length; 67 box.breadth = b.breadth + c.breadth; 68 box.height = b.height + c.height; 69 return box; 70 } 71 } 72 } 案例三

 

案例三,增加如下运算符重载的支撑代码

public static Box operator +(Box b, Box c) { Box box = new Box(); box.length = b.length + c.length; box.breadth = b.breadth + c.breadth; box.height = b.height + c.height; return box; }

 

 

 Box类,Box3 = Box1 + Box2;对应的计算运算式如下:

5878880 = (60+121)*(70+133)*(50+110)

以上案例成功实现了类的相加!



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