运算符的重载

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}

重载运算符是具有特殊名称的函数，是通过关键字 operator 后跟运算符的符号来定义的。与其他函数一样，重载运算符有返回类型和参数列表。

using System;

namespace OperatorOvlApplication
{
class Box
{
private double length; // 长度
private double breadth; // 宽度
private double height; // 高度

public double getVolume()
{
return length * breadth * height;
}
public void setLength(double len)
{
length = len;
}

public void setBreadth(double bre)
{
breadth = bre;
}

public void setHeight(double hei)
{
height = hei;
}
// 重载 + 运算符来把两个 Box 对象相加
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;
}

public static bool operator ==(Box lhs, Box rhs)
{
bool status = false;
if (lhs.length == rhs.length && lhs.height == rhs.height
&& lhs.breadth == rhs.breadth)
{
status = true;
}
return status;
}
public static bool operator !=(Box lhs, Box rhs)
{
bool status = false;
if (lhs.length != rhs.length || lhs.height != rhs.height
|| lhs.breadth != rhs.breadth)
{
status = true;
}
return status;
}
public static bool operator <(Box lhs, Box rhs)
{
bool status = false;
if (lhs.length < rhs.length && lhs.height
< rhs.height && lhs.breadth < rhs.breadth)
{
status = true;
}
return status;
}

public static bool operator >(Box lhs, Box rhs)
{
bool status = false;
if (lhs.length > rhs.length && lhs.height
> rhs.height && lhs.breadth > rhs.breadth)
{
status = true;
}
return status;
}

public static bool operator <=(Box lhs, Box rhs)
{
bool status = false;
if (lhs.length <= rhs.length && lhs.height
<= rhs.height && lhs.breadth <= rhs.breadth)
{
status = true;
}
return status;
}

public static bool operator >=(Box lhs, Box rhs)
{
bool status = false;
if (lhs.length >= rhs.length && lhs.height
>= rhs.height && lhs.breadth >= rhs.breadth)
{
status = true;
}
return status;
}
public override string ToString()
{
return String.Format("({0}, {1}, {2})", length, breadth, height);
}

}

class Tester
{
static void Main(string[] args)
{
Box Box1 = new Box(); // 声明 Box1，类型为 Box
Box Box2 = new Box(); // 声明 Box2，类型为 Box
Box Box3 = new Box(); // 声明 Box3，类型为 Box
Box Box4 = new Box();
double volume = 0.0; // 体积

// Box1 详述
Box1.setLength(6.0);
Box1.setBreadth(7.0);
Box1.setHeight(5.0);

// Box2 详述
Box2.setLength(12.0);
Box2.setBreadth(13.0);
Box2.setHeight(10.0);

// 使用重载的 ToString() 显示两个盒子
Console.WriteLine("Box1： {0}", Box1.ToString());
Console.WriteLine("Box2： {0}", Box2.ToString());

// Box1 的体积
volume = Box1.getVolume();
Console.WriteLine("Box1 的体积： {0}", volume);

// Box2 的体积
volume = Box2.getVolume();
Console.WriteLine("Box2 的体积： {0}", volume);

// 把两个对象相加
Box3 = Box1 + Box2;
Console.WriteLine("Box3： {0}", Box3.ToString());
// Box3 的体积
volume = Box3.getVolume();
Console.WriteLine("Box3 的体积： {0}", volume);

//comparing the boxes
if (Box1 > Box2)
Console.WriteLine("Box1 大于 Box2");
else
Console.WriteLine("Box1 不大于 Box2");
if (Box1 < Box2)
Console.WriteLine("Box1 小于 Box2");
else
Console.WriteLine("Box1 不小于 Box2");
if (Box1 >= Box2)
Console.WriteLine("Box1 大于等于 Box2");
else
Console.WriteLine("Box1 不大于等于 Box2");
if (Box1 <= Box2)
Console.WriteLine("Box1 小于等于 Box2");
else
Console.WriteLine("Box1 不小于等于 Box2");
if (Box1 != Box2)
Console.WriteLine("Box1 不等于 Box2");
else
Console.WriteLine("Box1 等于 Box2");
Box4 = Box3;
if (Box3 == Box4)
Console.WriteLine("Box3 等于 Box4");
else
Console.WriteLine("Box3 不等于 Box4");

Console.ReadKey();
}
}
}

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