1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6  7 namespace day01 8 { 9     class Class3010     {11         private int value;12         public int Value { get; set; }13         public Class30()14         {15 16         }17         public Class30(int value)18         {19             Value = value;20         }21         public static Class30 operator+(Class30 c1,Class30 c2)22         {23             Class30 cTemp = new Class30();24             cTemp.Value = c1.Value + c2.Value;25             return cTemp;26         }27         //static类方法 如何处理28         //该方法是取相反数29         public static Class30 operator -(Class30 c1)30         {31             Class30 cTemp = new Class30();32             cTemp.Value = -c1.Value;33             return cTemp;34         }35         public static Class30 operator -(Class30 c1, Class30 c2)36         {37             Class30 cTemp = new Class30();38             cTemp.Value = c1.Value - c2.Value;39             return cTemp;40         }41         static void Main(string[] args)42         {43             //Class30 c1 = new Class30(100);44             //Class30 c2 = new Class30(100);45             //Class30 c3 = c1 + c2;46             //Console.WriteLine(c3.Value);47             //Console.WriteLine();48 49             //Class30 c1 = new Class30(200);50             //Class30 c2 = new Class30(100);51 52             //Class30 c3 = c1 - c2;53             //Console.WriteLine(c3.Value);54 55             Class30 c1 = new Class30(100);56             Class30 cTemp = -c1;57             Console.WriteLine(cTemp.Value);58 59             Console.ReadKey();60         }61     }62 }