An addition speed test program is designed. After the program is started, the running interface is shown as shown in the diagram. Users click the "start" button to start timing, and respectively in the text box 1, 2 random generating and displaying the addend and summand, users in the text box to enter the answer 3, press enter after the program instructions in the answer behind the right and wrong, and show the next problem. A minute later, the program counts the number of questions and the number of pairs. The user clicks the "end" button to exit the program.

Filename	Size	Update
WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe	12288	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb	28160	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe	11600	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest	490	2010-03-17
WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs	3008	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs	8013	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Form1.resx	6011	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache	4501	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache	6399	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource.read.1.tlog	380	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource.write.1.tlog	926	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.csproj.FileListAbsolute.txt	1096	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.exe	12288	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Form1.resources	180	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.pdb	28160	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Properties.Resources.resources	180	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Program.cs	505	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Properties\AssemblyInfo.cs	1398	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.Designer.cs	2898	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.resx	5612	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.Designer.cs	1109	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.settings	249	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\WindowsFormsApplication1.csproj	3707	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1.sln	914	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1.suo	19968	2017-12-10
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\TempPE
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug
WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug
WindowsFormsApplication1\WindowsFormsApplication1\obj\x86
WindowsFormsApplication1\WindowsFormsApplication1\bin
WindowsFormsApplication1\WindowsFormsApplication1\obj
WindowsFormsApplication1\WindowsFormsApplication1\Properties
WindowsFormsApplication1\WindowsFormsApplication1
WindowsFormsApplication1

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