深入.NET平台和C#编程.第五章：上机练习4

---------------------------------------------ChengFa类---------------------------------------------

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace JiSji
 8 {
 9     public class ChengFa : Operation
10     {
11         /// <summary>
12         /// 乘法类
13         /// </summary>
14         /// <returns></returns>
15         public override double GetResult()
16         {
17             double result = NumberA * NumberB;
18             return result;
19         }
20     }
21 
22 
23 }

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