Install .NET Core SDK: First, you need to install the .NET Core SDK on your machine. You can download it from the official Microsoft website. Make sure to download the latest stable version.

Create a new project: Open a command prompt and navigate to the directory where you want to create your new project. Then, run the following command to create a new ASP.NET Core Web API project:


dotnet new webapi -n CalculatorAPI

This command creates a new Web API project with the name "CalculatorAPI".

Navigate to the project directory: Use the following command to navigate to the newly created project directory:

cd CalculatorAPI

Open the project in a code editor: You can use any code editor you prefer, but Visual Studio Code is a good choice for .NET Core development. If you have Visual Studio Code installed, you can open the project by typing:

code .

Update the Controller: In the Controllers folder, you'll see a default WeatherForecastController. You can replace this with the CalculatorController code I provided earlier.

Configure Routing: ASP.NET Core automatically configures routing for you. The [Route("api/[controller]")] attribute at the top of the controller class tells the framework to use the controller name in the route. The [HttpGet] attribute in each method tells the framework to use the method name as the route. So, for example, the Sum method can be accessed at api/calculator/sum.

Run the Application: You can run the application by typing the following command in the terminal:

dotnet run

This will start the application and it will listen for requests on localhost. You can use a tool like Postman to send 'HTTP' requests to the API.

Remember, when you're making requests, you'll need to include the parameters in the query string. For example, to call the Sum method with the numbers 5 and 3, you would send a 'GET' request to https://localhost:5001/api/calculator/sum?num1=5&num2=3
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