using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;

namespace?EX2_1
{
????class?Program
????{
????????static?void?Main（string[]?args）
????????{
????????????Console.WriteLine（“請輸入圓的半徑“）;
????????????string?r=?Console.ReadLine（）;
????????????double?IntR?=?Convert.ToDouble（r）;
????????????const?double?PI=3.1415926;
????????????Console.WriteLine（PI*IntR*IntR）;
????????}
????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????4608??2009-09-09?09:46??CH02\EX2_1\EX2_1\bin\Debug\EX2_1.exe

?????文件??????13824??2009-09-09?09:46??CH02\EX2_1\EX2_1\bin\Debug\EX2_1.pdb

?????文件??????14328??2009-11-24?14:47??CH02\EX2_1\EX2_1\bin\Debug\EX2_1.vshost.exe

?????文件????????490??2007-07-21?01:33??CH02\EX2_1\EX2_1\bin\Debug\EX2_1.vshost.exe.manifest

?????文件???????2483??2009-07-16?11:18??CH02\EX2_1\EX2_1\EX2_1.csproj

?????文件????????859??2009-11-24?14:47??CH02\EX2_1\EX2_1\obj\Debug\EX2_1.csproj.FileListAbsolute.txt

?????文件???????4608??2009-09-09?09:46??CH02\EX2_1\EX2_1\obj\Debug\EX2_1.exe

?????文件??????13824??2009-09-09?09:46??CH02\EX2_1\EX2_1\obj\Debug\EX2_1.pdb

?????文件????????448??2009-09-09?09:46??CH02\EX2_1\EX2_1\Program.cs

?????文件???????1366??2009-07-16?11:18??CH02\EX2_1\EX2_1\Properties\AssemblyInfo.cs

?????文件????????905??2009-07-16?11:18??CH02\EX2_1\EX2_1.sln

????..A..H.?????13312??2009-11-24?14:48??CH02\EX2_1\EX2_1.suo

?????文件???????5120??2009-08-06?11:15??CH02\EX2_10\EX2_10\bin\Debug\EX2_10.exe

?????文件??????13824??2009-08-06?11:15??CH02\EX2_10\EX2_10\bin\Debug\EX2_10.pdb

?????文件??????14328??2009-08-06?14:21??CH02\EX2_10\EX2_10\bin\Debug\EX2_10.vshost.exe

?????文件????????490??2007-07-21?01:33??CH02\EX2_10\EX2_10\bin\Debug\EX2_10.vshost.exe.manifest

?????文件???????2485??2009-07-22?13:54??CH02\EX2_10\EX2_10\EX2_10.csproj

?????文件????????463??2009-08-06?14:21??CH02\EX2_10\EX2_10\obj\Debug\EX2_10.csproj.FileListAbsolute.txt

?????文件???????5120??2009-08-06?11:15??CH02\EX2_10\EX2_10\obj\Debug\EX2_10.exe

?????文件??????13824??2009-08-06?11:15??CH02\EX2_10\EX2_10\obj\Debug\EX2_10.pdb

?????文件???????2213??2009-07-28?08:43??CH02\EX2_10\EX2_10\Program.cs

?????文件???????1368??2009-07-22?13:54??CH02\EX2_10\EX2_10\Properties\AssemblyInfo.cs

?????文件????????908??2009-07-22?13:54??CH02\EX2_10\EX2_10.sln

????..A..H.?????13824??2009-08-06?14:22??CH02\EX2_10\EX2_10.suo

?????文件???????5120??2009-07-17?17:19??CH02\EX2_2\EX2_2\bin\Debug\EX2_2.exe

?????文件??????13824??2009-07-17?17:19??CH02\EX2_2\EX2_2\bin\Debug\EX2_2.pdb

?????文件??????14328??2009-07-17?14:18??CH02\EX2_2\EX2_2\bin\Debug\EX2_2.vshost.exe

?????文件????????490??2007-07-21?01:33??CH02\EX2_2\EX2_2\bin\Debug\EX2_2.vshost.exe.manifest

?????文件???????2483??2009-07-17?14:18??CH02\EX2_2\EX2_2\EX2_2.csproj

?????文件????????231??2009-07-17?15:50??CH02\EX2_2\EX2_2\obj\Debug\EX2_2.csproj.FileListAbsolute.txt

............此處省略2243個文件信息