Exercise "Hello, World!"

• Install csharp-mono at your system and build a "Hello, World!" program" (a program that outputs "Hello, World!").

Tasks

1. Install mono with the command

   sudo apt install mono-mcs
   

   MacOS users might need to install mono from the mono-poject [mono-project.com].

2. Create a directory for the exercise inside your repository, let's say "~/repos/ppnm/exercises/hello",

   mkdir -p ~/repos/ppnm/exercises/hello

3. Go to your directory (remember to use the completion feature of your shell !):

   cd ~/repos/ppnm/exercises/hello

4. Create a Makefile with the following content (mind the tabulators!) (and you can omit the comments):
   

   Out.txt : hello.exe              # Out.txt depends on hello.exe
   	mono hello.exe > Out.txt # run hello.exe, send output to Out.txt
   
   hello.exe : hello.cs             # hello.exe depends on hello.cs
   	mcs hello.cs             # compile hello.cs into hello.exe
   
   clean:                           # a phoney target, no dependencies
   	rm -f Out.txt hello.exe  # remove secondary files
   

5. Create a file hello.cs with the following content
   

   class hello{
      static void Main(){
         System.Console.Write("hello\n");
      }
   }
   

6. Run make and debug.

Extra hints

• For nano users: you can indicate the invisible tabulator-signs with a color by adding the following lines to your ~/.nanorc,

  syntax "makefile" "[Mm]akefile"
  color white,magenta "	"
  

  where the character in between the quotation marks in the second line should be the tabulator sign and where the colors are free for you to choose.

• If you use GNU make version 3.82+ and you don't like your recipies to start with the tabulator-sign, you can do
  .RECIPEPREFIX := ;