Merge branch 'main' into dev/doti/tip-calc

Author: jsuarezruiz

10.0/Apps/RpnCalculator/README.md

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+---
+name: .NET MAUI - RPN Calculator
+description: An RPN (Reverse Polish Notation) calculator allows numbers and operations to be entered without parentheses or an equal key. RPN (also called...
+page_type: sample
+languages:
+- csharp
+- xaml
+products:
+- dotnet-maui
+urlFragment: rpncalculator
+---
+# RPN Calculator
+
+An RPN (Reverse Polish Notation) calculator allows numbers and operations to be entered without parentheses or an equal key. RPN (also called postfix notation) is described in the Wikipedia article [**Reverse Polish notation**](https://en.wikipedia.org/wiki/Reverse_Polish_notation). This sample demonstrates how to build an RPN calculator using .NET MAUI.
+
+RPN is based on a stack. Numbers are pushed on the stack by pressing the ENTER key. Unary operations (such as **log** and **sin**) pop a number from the stack, apply the operation, and push the result back on the stack. Binary operations (such as **+** and **/**) pop two numbers from the stack, perform the operation, and push the result on the stack.
+
+To perform the calculation
+
+5 × (3 + 4) – 2
+
+press the following keys:
+
+5 ENTER 3 ENTER 4 ENTER + × 2 ENTER –
+
+The + operation adds 3 and 4, the times operation multiplies 5 and that result, and the minus operation subtracts 2 from that result.
+
+The layout of the keys appears twice in the **MainPage.xaml** file, separately for portrait mode and landscape mode. The **MainPage.xaml.cs** code-behind file switches between these two layouts based on the relative width and height of the page.
+
+The calculator logic is encapsulated in the **RpnCalculatorViewModel.cs** file. The XAML file and the ViewModel are linked through XAML-based data bindings, which are described in detail in the series of articles on [**Data Binding**](https://docs.microsoft.com/dotnet/maui/fundamentals/data-binding/), and particularly the [**The Command Interface**](https://docs.microsoft.com/dotnet/maui/fundamentals/data-binding/commanding) article.
+
+![RPN Calculator application screenshot](Screenshots/rpn-calculator-vertical.png "RPN Calculator application screenshot")

10.0/Apps/RpnCalculator/RpnCalculator.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36221.1 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RpnCalculator", "RpnCalculator\RpnCalculator.csproj", "{DEF0A9EC-6E64-4D73-8EA0-E57585B76253}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{DEF0A9EC-6E64-4D73-8EA0-E57585B76253}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DEF0A9EC-6E64-4D73-8EA0-E57585B76253}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DEF0A9EC-6E64-4D73-8EA0-E57585B76253}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DEF0A9EC-6E64-4D73-8EA0-E57585B76253}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AF39BAFC-5362-4DE0-99C1-F12D24DA1B9A}
+	EndGlobalSection
+EndGlobal

10.0/Apps/RpnCalculator/RpnCalculator/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:RpnCalculator"
+             x:Class="RpnCalculator.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

10.0/Apps/RpnCalculator/RpnCalculator/App.xaml.cs

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+namespace RpnCalculator;
+
+public partial class App : Application
+{
+    public App()
+    {
+        InitializeComponent();
+    }
+
+    protected override Window CreateWindow(IActivationState? activationState)
+    {
+        return new Window(new MainPage());
+    }
+}