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

namespace?use_if
{
????class?Program
????{
????????static?void?Main（string[]?args）
????????{
????????????int?grade?=?75;?//定義學(xué)生成績
????????????if?（grade?>=?80）
????????????{
????????????????//滿足條件?grade?>?=80
????????????????Console.WriteLine（“該成績的等級(jí)為優(yōu)“）;
????????????}
????????????else?if?（grade?>=?70）
????????????{
????????????????//不滿足條件?grade?>?=?80?，但滿足條件?grade?>?=?70?
????????????????Console.WriteLine（“該成績的等級(jí)為良“）;
????????????}
????????????else?if?（grade?>=?60）
????????????{
????????????????//不滿足條件?grade?>?=?70?，但滿足條件?grade?>?=?60?
????????????????Console.WriteLine（“該成績的等級(jí)為中“）;
????????????}
????????????else
????????????{
????????????????//不滿足條件?grade?>?=?6
????????????????Console.WriteLine（“該成績的等級(jí)為差“）;
????????????}
????????????Console.ReadKey（）;
????????}
????}
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????1312??2019-03-02?18:36??score?grade\score?grade.sln

????..A..H.?????35328??2019-03-02?19:03??score?grade\score?grade.suo

?????文件???????5120??2019-03-02?19:03??score?grade\use?if\bin\Debug\use?if.exe

?????文件??????13824??2019-03-02?19:03??score?grade\use?if\bin\Debug\use?if.pdb

?????文件???????5871??2019-03-02?19:03??score?grade\use?if\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

?????文件????????385??2019-03-02?19:03??score?grade\use?if\obj\x86\Debug\use?if.csproj.FileListAbsolute.txt

?????文件???????7049??2019-03-02?19:03??score?grade\use?if\obj\x86\Debug\use?if.csprojResolveAssemblyReference.cache

?????文件???????5120??2019-03-02?19:03??score?grade\use?if\obj\x86\Debug\use?if.exe

?????文件??????13824??2019-03-02?19:03??score?grade\use?if\obj\x86\Debug\use?if.pdb

?????文件???????5875??2019-03-02?19:03??score?grade\use?if\obj\x86\Release\DesignTimeResolveAssemblyReferencesInput.cache

?????文件???????1044??2019-03-02?18:37??score?grade\use?if\Program.cs

?????文件???????1344??2019-03-02?18:36??score?grade\use?if\Properties\AssemblyInfo.cs

?????文件???????2433??2019-03-02?18:36??score?grade\use?if\use?if.csproj

?????文件???????5120??2019-03-02?18:26??score?grade\use?switch\bin\Debug\use?switch.exe

?????文件??????11776??2019-03-02?18:26??score?grade\use?switch\bin\Debug\use?switch.pdb

?????文件??????11600??2019-03-02?19:03??score?grade\use?switch\bin\Debug\use?switch.vshost.exe

?????文件??????11600??2019-03-02?19:03??score?grade\use?switch\bin\Release\use?switch.vshost.exe

?????文件????????490??2013-06-18?20:28??score?grade\use?switch\bin\Release\use?switch.vshost.exe.manifest

?????文件???????5879??2019-03-02?18:26??score?grade\use?switch\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

?????文件????????312??2019-03-02?19:03??score?grade\use?switch\obj\x86\Debug\use?switch.csproj.FileListAbsolute.txt

?????文件???????5120??2019-03-02?18:26??score?grade\use?switch\obj\x86\Debug\use?switch.exe

?????文件??????11776??2019-03-02?18:26??score?grade\use?switch\obj\x86\Debug\use?switch.pdb

?????文件???????5883??2019-03-02?19:03??score?grade\use?switch\obj\x86\Release\DesignTimeResolveAssemblyReferencesInput.cache

?????文件????????971??2019-03-02?18:26??score?grade\use?switch\Program.cs

?????文件???????1352??2019-03-02?18:26??score?grade\use?switch\Properties\AssemblyInfo.cs

?????文件???????2441??2019-03-02?18:26??score?grade\use?switch\use?switch.csproj

?????目錄??????????0??2019-03-02?18:36??score?grade\use?if\obj\x86\Debug\TempPE

?????目錄??????????0??2019-03-02?19:03??score?grade\use?if\obj\x86\Release\TempPE

?????目錄??????????0??2019-03-02?18:26??score?grade\use?switch\obj\x86\Debug\TempPE

?????目錄??????????0??2019-03-02?19:03??score?grade\use?switch\obj\x86\Release\TempPE

............此處省略22個(gè)文件信息