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Local development

To run the code for your challenge locally, you’ll need dotnet installed. Our test runners use Dotnet 8.0 (as of April 2024). The script for your challenge (like ./your_sqlite3.sh) will automatically compile your code using dotnet before executing it. It’ll look something like this: 
#!/bin/sh

exec dotnet run --project . --configuration Release -- "$@"

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File structure

  • The files for your solution are placed in the src/ directory.
  • src/Program.cs contains the main function, which is what the test runner executes.
  • The .csproj file defines project settings, target frameworks and dependencies.

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Adding more files

You can add more files and directories to src/. The test runner will include them when compiling your code. For example, if you added a file at src/Foo.cs, you could use it like so: 
public class Main {
    public static void Main(String[] args) {
        Foo.foo();  // calls the method foo() from Foo class in Foo.cs
    }
}
By default, all classes in src/ belong to the same namespace. This namespace is called the project namespace. E.g. If the project name is MyProject, all classes are defined under the MyProject namespace. This is why you can call foo() without importing anything. If you want to define a class under a different namespace, you’ll need to use the namespace keyword like this: 
namespace AnotherNamespace {
    public class Foo {
        public static void foo(string[] args) {
            // write code here
        }
    }
}
Let’s say you want to define the Foo class in Foo.cs under the AnotherNamespace namespace. 
namespace AnotherNamespace {
    public class Foo {
        public static void foo() {
            System.out.println("Hello world!");
        }
    }
}

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Adding dependencies

You can add dependencies to your project by using dotnet. For example, to add the Newtonsoft.Json package, run the following command in your terminal: 
dotnet add package Newtonsoft.Json
It will also update your .csproj file with the package reference: 
<ItemGroup>
  <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
</ItemGroup>