Program2.cs:

Program2.cs
?1using?System;
?2class?Program2
?3{
?4????static?void?Main(string[]?args)
?5????{
?6????????try
?7????????{
?8????????????Console.Write("?請輸入數字A：");
?9????????????string?strNumberA?=?Console.ReadLine();
10????????????Console.Write("?請選擇運算符號(+、-、*、/)：");
11????????????string?strOperate?=?Console.ReadLine();
12????????????Console.Write("?請輸入數字B：");
13????????????string?strNumberB?=?Console.ReadLine();
14????????????string?strResult?=?"";
15????????????strResult?=?Convert.ToString(?Operation.GetResult(?Convert.ToDouble(strNumberA),?Convert.ToDouble(strNumberB),?strOperate?)?);
16????????????Console.WriteLine("?結果是："?+?strResult);
17????????????Console.ReadLine();
18????????}
19????????catch?(Exception?ex)
20????????{
21????????????Console.WriteLine("?您的輸入有錯："?+?ex.Message);
22????????}
23????}
24}
25
26public?class?Operation
27{
28????public?static?double?GetResult(?double?numberA,?double?numberB,?string?operate?)
29????{
30????????double?result?=?0d;
31????????switch?(operate)
32????????{
33????????????case?"+":
34????????????????result?=?numberA?+?numberB;
35????????????????break;
36????????????
37????????????case?"-":
38????????????????result?=?numberA?-?numberB;
39????????????????break;
40???????????
41????????????case?"*":
42????????????????result?=?numberA?*?numberB;
43????????????????break;
44????????????
45????????????case?"/":
46????????????????result?=?numberA?/?numberB;
47????????????????break;
48????????}
49????????return?result;
50????}
51}
52/**//*
53D:\C#\Code1>Program2
54?請輸入數字A：2
55?請選擇運算符號(+、-、*、/)：/
56?請輸入數字B：12
57?結果是：0.166666666666667
58
59
60D:\C#\Code1>Program2
61?請輸入數字A：3
62?請選擇運算符號(+、-、*、/)：/
63?請輸入數字B：0
64?結果是：正無窮大
65
66
67D:\C#\Code1>Program2
68?請輸入數字A：w
69?請選擇運算符號(+、-、*、/)：-
70?請輸入數字B：3
71?您的輸入有錯：輸入字符串的格式不正確。
72*/

?雖是面向對象 且 業務邏輯 與 界面邏輯 已分開，還有什么問題？

轉載于:https://www.cnblogs.com/zqblog007/archive/2008/09/12/1290114.html

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