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

namespace?S3_4
{
????class?AreaCalculate
????{
????????AreaCalculate（）?{?}
????????///?

????????///?求圓的面積
????????///?

????????///?半徑
????????///?
????????public?static?double?GetArea（double?radius）
????????{
????????????return?Math.PI?*?radius?*?radius;
????????}
????????///?

????????///?求矩形的面積
????????///?

????????///?長
????????///?寬
????????///?
????????public?static?double?GetArea（double?width?double?height）
????????{
????????????return?width?*?height;
????????}
????????///?

????????///?求三角形的面積依據海倫公式
????????///?

????????///?邊長1
????????///?邊長2
????????///?邊長3
????????///?
????????public?static?double?GetArea（double?side1?double?side2?double?side3）
????????{
????????????//僅當兩邊之和及兩邊之差大于第三邊即邊長為正數才能構成三角形
????????????if?（（side1?+?side2?>?side3?&&?side1?+?side3?>?side2?&&?side2?+?side3?>?side1）?&&?（side1?-?side2??0?&&?side2?>?0?&&?side3?>?0））
????????????{
????????????????double?p?=?0.5?*?（side1?+?side2?+?side3）;
????????????????return?Math.Sqrt（p?*?（p?-?side1）?*?（p?-?side2）?*?（p?-?side3））;
????????????}
????????????else
????????????{
????????????????Console.WriteLine（“數據錯誤!請檢查輸入的三條邊的數據“）;
????????????????return?0;
????????????}
????????}
????????static?void?Main（string[]?args）
????????{
????????????AreaCalculate?ac?=?new?AreaCalculate（）;
????????????double?radius?=?3.0;//半徑
????????????double?width?=?2.3;//長
????????????double?height?=?4.5;//寬
????????????double?side1?=?2;//三角形三邊長
????????????double?side2?=?2;
????????????double?side3?=?2;
????????????Console.WriteLine（“半徑為{0}的圓的面積為{1:f4}“?radius?AreaCalculate.GetArea（radius））;//f4表示保留4位小數
????????????Console.WriteLine（“長為{0}寬為{1}的矩形的面積為{2:f4}“?width?height?AreaCalculate.GetArea（width?height））;
????????????Console.WriteLine（“三邊長分別為{0}{1}{2}的三角形的面積為{3:f4}“?side1?side2?side3?AreaCalculate.GetArea（side1?side2?side3））;
????????}
????}
}

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

?????文件???????2604??2013-12-29?15:56??S3-4\S3-4\AreaCalculate.cs

?????文件???????5632??2013-12-29?15:56??S3-4\S3-4\bin\Debug\S3-4.exe

?????文件??????15872??2013-12-29?15:56??S3-4\S3-4\bin\Debug\S3-4.pdb

?????文件??????11600??2013-12-29?19:12??S3-4\S3-4\bin\Debug\S3-4.vshost.exe

?????文件????????490??2009-08-31?00:40??S3-4\S3-4\bin\Debug\S3-4.vshost.exe.manifest

?????文件???????5846??2013-12-29?15:56??S3-4\S3-4\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

?????文件????????465??2013-12-29?19:12??S3-4\S3-4\obj\x86\Debug\S3-4.csproj.FileListAbsolute.txt

?????文件???????6952??2013-12-29?15:56??S3-4\S3-4\obj\x86\Debug\S3-4.csprojResolveAssemblyReference.cache

?????文件???????5632??2013-12-29?15:56??S3-4\S3-4\obj\x86\Debug\S3-4.exe

?????文件??????15872??2013-12-29?15:56??S3-4\S3-4\obj\x86\Debug\S3-4.pdb

?????文件???????1340??2013-12-29?15:41??S3-4\S3-4\Properties\AssemblyInfo.cs

?????文件???????2471??2013-12-29?15:52??S3-4\S3-4\S3-4.csproj

?????文件????????148??2013-12-29?15:43??S3-4\S3-4\Shape.cs

?????文件????????854??2013-12-29?15:41??S3-4\S3-4.sln

????..A..H.?????16896??2013-12-29?19:12??S3-4\S3-4.suo

?????目錄??????????0??2013-12-29?15:41??S3-4\S3-4\obj\x86\Debug\TempPE

?????目錄??????????0??2013-12-29?15:56??S3-4\S3-4\obj\x86\Debug

?????目錄??????????0??2013-12-29?15:55??S3-4\S3-4\bin\Debug

?????目錄??????????0??2013-12-29?15:41??S3-4\S3-4\obj\x86

?????目錄??????????0??2013-12-29?15:41??S3-4\S3-4\bin

?????目錄??????????0??2013-12-29?15:41??S3-4\S3-4\obj

?????目錄??????????0??2013-12-29?15:41??S3-4\S3-4\Properties

?????目錄??????????0??2013-12-29?15:51??S3-4\S3-4

?????目錄??????????0??2013-12-29?15:41??S3-4

-----------?---------??----------?-----??----

????????????????92674????????????????????24