Building Simple Console App Mac

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The .NET documentation contains a set of samples and tutorials that teach you about .NET. This topic describes how to find, view, and download .NET Core, ASP.NET Core, and C# samples and tutorials. Find resources to learn the F# programming language on the F# Foundation's site. If you're interested in exploring C# using an online code editor, start with this interactive tutorial and continue with C# interactive tutorial. For instructions on how to view and download sample code, see the Viewing and downloading samples section.

.NET Core

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Samples

This guide shows you how to create an ASP.NET Core web app and associated unit tests. It starts by creating a simple web service app and then adds tests. It continues with creating more tests to guide implementing new features. The completed sample is available in the dotnet/samples repository on GitHub.

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Tutorials

This guide shows you how to use the .NET Core CLI tooling to build cross-platform console apps. It starts with a basic console app and eventually spans multiple projects, including testing. You add features step-by-step, building your knowledge as you go. The completed sample is available in the dotnet/samples repository on GitHub.

Oct 24, 2016  Creating a simple Visual Studio Code task for building C/C code To follow this specific section you can go ahead and download this helloworld C source folder. If you run into any issues you can always cheat and download the same C source folder with a task pre-configured.

This sample covers how to write libraries for .NET using the .NET Core CLI. These tools provide an efficient and low-level experience that works across any supported operating system. The completed sample is available in the dotnet/samples repository on GitHub.

ASP.NET Core

See the ASP.NET Core tutorials. Many articles in the ASP.NET Core documentation have links to samples written for them.

C# language

Samples

This sample demonstrates the syntax and features for creating and consuming C# iterators. The completed sample is available in the dotnet/samples repository on GitHub.

This sample demonstrates the syntax and features for C# indexers. The completed sample is available in the dotnet/samples repository on GitHub.

This sample demonstrates the syntax and features for C# delegates and events. The completed sample is available in the dotnet/samples repository on GitHub. A second sample focused on events is also in the same repository.

This sample demonstrates many of the problems that can be solved by using Expression Trees. The completed sample is available in the dotnet/samples repository on GitHub.

LINQ Samples

This series of samples demonstrate many of the features of Language Integrated Query (LINQ). The completed sample is available in the dotnet/samples repository on GitHub.

Managed COM server Sample

The COM server sample demonstrates the creation of a managed COM server and how it can be globally registered or consumed via RegFree COM.

Microsoft Office PIA Sample

The ExcelDemo sample demonstrates the consumption of Microsoft Office PIAs in .NET Core.

Tutorials

This tutorial demonstrates Console I/O, the structure of a console app, and the basics of the task-based asynchronous programming model. The completed sample is available in the dotnet/samples repository on GitHub.

This tutorial demonstrates web communications, JSON serialization, and object-oriented features of the C# language. The completed sample is available in the dotnet/samples repository on GitHub.

This tutorial demonstrates many of the features of LINQ and the language elements that support it. The completed sample is available in the dotnet/samples repository on GitHub.

Building Simple Console App Mac Free

This tutorial shows you how to build a simple .NET Core console app using Visual Studio for Mac.

This tutorial shows you how to build a complete .NET Core solution that includes a reusable library and unit testing.

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This tutorial shows you how to build a simple application on .NET Core that supports a plugin architecture. The completed sample is available in the dotnet/samples repository on GitHub.

Deploy to containers

This tutorial demonstrates how to deploy an existing ASP.NET MVC app in a Windows Docker Container. The completed sample is available in the dotnet/samples repository on GitHub.

Viewing and downloading samples

Many topics show source code and samples that are available for viewing or download from GitHub. To view a sample, just follow the sample link. To download the code, follow these instructions:

  1. Download the repository that contains the sample code by performing one of the following procedures:
    • Download a ZIP of the repository to your local system. Un-ZIP the compressed archive.
    • Fork the repository and clone the fork to your local system. Forking and cloning permits you to make contributions to the documentation by committing changes to your fork and then creating a pull request for the official docs repository. For more information, see the .NET Documentation Contributing Guide and the ASP.NET Core Docs Contributing Guide.
    • Clone the repository locally. If you clone a docs repository directly to your local system, you won't be able to make commits directly against the official repository, so you won't be able to make documentation contributions later. Use the fork and clone procedure previously described if you want to preserve the opportunity to contribute to the documentation later.
  2. Navigate within the repository's folders to the sample's location. The relative path to the sample's location appears in your browser's address bar when you follow the link to the sample.
  3. To run a sample, you have several options:
    • Use the .NET Core CLI: In a console window, navigate to the sample's folder and use dotnet CLI commands.
    • Use Visual Studio or Visual Studio for Mac: Open the sample by selecting File > Open > Project/Solution from the menu bar, navigate to the sample project folder, and select the project file (.csproj or .fsproj).
    • Use Visual Studio Code: Open the sample by selecting File > Open Folder from the menu bar and selecting the sample's project folder.
    • Use a different IDE that supports .NET Core projects.
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In this tutorial for C#, you'll use Visual Studio to create and run a console app and explore some features of the Visual Studio integrated development environment (IDE) while you do so.

App

If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free.

If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free.

Create a project

To start, we'll create a C# application project. The project type comes with all the template files you'll need, before you've even added anything!

  1. Open Visual Studio 2017.

  2. From the top menu bar, choose File > New > Project.(Alternatively, press Ctrl+Shift+N).

  3. In the left pane of the New Project dialog box, expand C#, and then choose .NET Core. In the middle pane, choose Console App (.NET Core). Then name the file Calculator.

Add a workload (optional)

If you don't see the Console App (.NET Core) project template, you can get it by adding the .NET Core cross-platform development workload. Here's how.

Option 1: Use the New Project dialog box

  1. Choose the Open Visual Studio Installer link in the left pane of the New Project dialog box.

  2. The Visual Studio Installer launches. Choose the .NET Core cross-platform development workload, and then choose Modify.

Option 2: Use the Tools menu bar

  1. Cancel out of the New Project dialog box and from the top menu bar, choose Tools > Get Tools and Features.

  2. The Visual Studio Installer launches. Choose the .NET Core cross-platform development workload, and then choose Modify.

  1. Open Visual Studio 2019.

  2. On the start window, choose Create a new project.

  3. On the Create a new project window, enter or type console in the search box. Next, choose C# from the Language list, and then choose Windows from the Platform list.

    After you apply the language and platform filters, choose the Console App (.NET Core) template, and then choose Next.

    Note

    If you do not see the Console App (.NET Core) template, you can install it from the Create a new project window. In the Not finding what you're looking for? message, choose the Install more tools and features link.

    Then, in the Visual Studio Installer, choose the .NET Core cross-platform development workload.

    After that, choose the Modify button in the Visual Studio Installer. You might be prompted to save your work; if so, do so. Next, choose Continue to install the workload. Then, return to step 2 in this 'Create a project' procedure.

  4. In the Configure your new project window, type or enter Calculator in the Project name box. Then, choose Create.

    Visual Studio opens your new project, which includes default 'Hello World' code.

Create the app

First, we'll explore some basic integer math in C#. Then, we'll add code to create a basic calculator. After that, we'll debug the app to find and fix errors. And finally, we'll refine the code to make it more efficient.

Explore integer math

Let's start with some basic integer math in C#.

  1. In the code editor, delete the default 'Hello World' code.

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    Specifically, delete the line that says, Console.WriteLine('Hello World!');.

  2. In its place, type the following code:

    Notice that when you do so, the IntelliSense feature in Visual Studio offers you the option to autocomplete the entry.

    Note

    The following animation isn't intended to duplicate the preceding code. It's intended only to show how the autocomplete feature works.

  3. Choose the green Start button next to Calculator to build and run your program, or press F5.

    A console window opens that reveals the sum of 42 + 119, which is 161.

  4. (Optional) You can change the operator to change the result. For example, you can change the + operator in the int c = a + b; line of code to - for subtraction, * for multiplication, or / for division. Then, when you run the program, the result changes, too.

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  5. Close the console window.

Add code to create a calculator

Let's continue by adding a more complex set of calculator code to your project.

  1. Delete all the code you see in the code editor.

  2. Enter or paste the following new code into the code editor:

  3. Choose Calculator to run your program, or press F5.

    A console window opens.

  4. View your app in the console window, and then follow the prompts to add the numbers 42 and 119.

    Your app should look similar to the following screenshot:

Add functionality to the calculator

Let's tweak the code to add further functionality.

Add decimals

The calculator app currently accepts and returns whole numbers. But, it will be more precise if we add code that allows for decimals.

As in the following screenshot, if you run the app and divide number 42 by the number 119, your result is 0 (zero), which isn't exact.

Let's fix the code so that it handles decimals.

  1. Press Ctrl + H to open the Find and Replace control.

  2. Change each instance of the int variable to float.

    Make sure that you toggle Match case (Alt+C) and Match whole word (Alt+W) in the Find and Replace control.

  3. Run your calculator app again and divide the number 42 by the number 119.

    Notice that the app now returns a decimal numeral instead of zero.

However, the app produces only a decimal result. Let's make a few more tweaks to the code so that the app can calculate decimals too.

  1. Use the Find and Replace control (Ctrl + H) to change each instance of the float variable to double, and to change each instance of the Convert.ToInt32 method to Convert.ToDouble.

  2. Run your calculator app and divide the number 42.5 by the number 119.75.

    Notice that the app now accepts decimal values and returns a longer decimal numeral as its result.

    (We'll fix the number of decimal places in the Revise the code section.)

Debug the app

We've improved on our basic calculator app, but it doesn't yet have fail safes in place to handle exceptions, such as user input errors.

For example, if you try to divide a number by zero, or enter an alpha character when the app expects a numeric character (or vice versa), the app might stop working, return an error, or return an unexpected nonnumeric result.

Let's walk through a few common user input errors, locate them in the debugger if they appear there, and fix them in the code.

Tip

For more information about the debugger and how it works, see the First look at the Visual Studio debugger page.

Fix the 'divide by zero' error

When you try to divide a number by zero, the console app might freeze and then show you what's wrong in the code editor.

Note

Sometimes, the app doesn't freeze and the debugger won't show a divide-by-zero error. Instead, the app might return an unexpected nonnumeric result, such as an infinity symbol. The following code fix still applies.

Let's change the code to handle this error.

  1. Delete the code that appears directly between case 'd': and the comment that says // Wait for the user to respond before closing.

  2. Replace it with the following code:

    After you add the code, the section with the switch statement should look similar to the following screenshot:

Now, when you divide any number by zero, the app will ask for another number. Even better: It won't stop asking until you provide a number other than zero.

Fix the 'format' error

If you enter an alpha character when the app expects a numeric character (or vice versa), the console app freezes. Visual Studio then shows you what's wrong in the code editor.

To fix this error, we must refactor the code that we've previously entered.

Revise the code

Rather than rely on the program class to handle all the code, we'll divide our app into two classes: Calculator and Program.

The Calculator class will handle the bulk of the calculation work, and the Program class will handle the user interface and error-capturing work.

Let's get started.

  1. Delete everything in the Calculator namespace between its opening and closing braces:

  2. Next, add a new Calculator class, as follows:

  3. Then, add a new Program class, as follows:

  4. Choose Calculator to run your program, or press F5.

  5. Follow the prompts and divide the number 42 by the number 119. Your app should look similar to the following screenshot:

    Notice that you have the option to enter more equations until you choose to close the console app. And, we've also reduced the number of decimal places in the result.

Close the app

  1. If you haven't already done so, close the calculator app.

  2. Close the Output pane in Visual Studio.

  3. In Visual Studio, press Ctrl+S to save your app.

  4. Close Visual Studio.

Code complete

During this tutorial, we've made a lot of changes to the calculator app. The app now handles computing resources more efficiently, and it handles most user input errors.

Here's the complete code, all in one place:

Next steps

Congratulations on completing this tutorial! To learn even more, continue with the following tutorials.

Building Simple Console App Machine

See also