Maths Class

<Project ToolsVersion="4.0" DefaultTargets="Default" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <PropertyGroup>
        <TPath>$(MSBuildProjectDirectory)\..\MSBuild.ExtensionPack.tasks</TPath>
        <TPath Condition="Exists('$(MSBuildProjectDirectory)\..\..\Common\MSBuild.ExtensionPack.tasks')">$(MSBuildProjectDirectory)\..\..\Common\MSBuild.ExtensionPack.tasks</TPath>
    </PropertyGroup>
    <Import Project="$(TPath)"/>
    <Target Name="Default">
        <!-- Left Shift two numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="LeftShift" Numbers="15;2">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="LeftShift: $(RResult)"/>
        <!-- Right Shift two numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="RightShift" Numbers="33;3">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="RightShift: $(RResult)"/>
        <!-- Or two numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Or" Numbers="5;4">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Or: $(RResult)"/>
        <!-- Mod two numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Modulus" Numbers="10;3">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Modulus: $(RResult)"/>
        <!-- Evaluate a basic expression -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Evaluate" Expression="180 / (5 * (18/3)) + 2">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Evaluate: $(RResult)"/>
        <!-- Add numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Add" Numbers="13;2;13;2;13;2;13;2">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Add: $(RResult)"/>
        <!-- Subtract numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Subtract" Numbers="13;2">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Subtract: $(RResult)"/>
        <!-- Divide numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Divide" Numbers="13;2.6235">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Divide: $(RResult)"/>
        <!-- Multiply numbers -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Multiply" Numbers="13;2">
            <Output PropertyName="RResult" TaskParameter="Result"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Multiply: $(RResult)"/>
        <!-- Compare whether one number is less than the other -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Compare" P1="2" P2="60" Comparison="LessThan">
            <Output PropertyName="RResult" TaskParameter="LogicalResult"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Message Text="Compare: $(RResult)"/>
        <CallTarget Targets="Default2"/>
    </Target>
    <!-- Factorial calculation provided by Stephen Cleary -->
    <Target Name="Default2">
        <PropertyGroup>
            <Input>8</Input>
        </PropertyGroup>
        <!-- Argument error checking -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Compare" P1="$(Input)" P2="1" Comparison="LessThan">
            <Output TaskParameter="LogicalResult" PropertyName="InputCheck"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <Error Condition="'$(InputCheck)' != 'False'" Text="Input cannot be less than 1."/>
        <!-- Invoke the Factorial target with the current Input property -->
        <MSBuild Projects="$(MSBuildProjectFile)" Targets="Factorial" Properties="Input=$(Input)">
            <Output TaskParameter="TargetOutputs" ItemName="FactorialResult"/>
        </MSBuild>
        <!-- Display the result -->
        <Message Importance="high" Text="Result: @(FactorialResult)"/>
    </Target>
    <!-- The Factorial target uses FactorialCore to do the calculation, storing the result in FactorialResult -->
    <Target Name="Factorial" DependsOnTargets="FactorialCore" Outputs="$(FactorialResult)"/>
    <Target Name="FactorialCore">
        <!-- If the input is 1, then the factorial is 1 -->
        <PropertyGroup Condition="'$(Input)' == '1'">
            <FactorialResult>1</FactorialResult>
        </PropertyGroup>
        <!-- If we don't know the result yet (i.e. the input is not 1) then calculate the factorial -->
        <CallTarget Condition="'$(FactorialResult)' == ''" Targets="CalculateFactorial"/>
    </Target>
    <Target Name="CalculateFactorial">
        <!-- Subtract 1 from $(Input) -->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Subtract" Numbers="$(Input);1">
            <Output TaskParameter="Result" PropertyName="InputMinus1"/>
        </MSBuild.ExtensionPack.Science.Maths>
        <!-- Determine the factorial of $(Input) - 1 -->
        <MSBuild Projects="$(MSBuildProjectFile)" Targets="Factorial" Properties="Input=$(InputMinus1)">
            <Output TaskParameter="TargetOutputs" ItemName="SubResult"/>
        </MSBuild>
        <!-- Multiply !($(Input) - 1) by $(Input) to get the result-->
        <MSBuild.ExtensionPack.Science.Maths TaskAction="Multiply" Numbers="@(SubResult);$(Input)">
            <Output TaskParameter="Result" PropertyName="FactorialResult"/>
        </MSBuild.ExtensionPack.Science.Maths>
    </Target>
</Project>