Exercise "Hello, World!"

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

Tasks

Install Csharp-mono on your system. On many systems the "csharp-mono" environment is prepackaged by the system developers and can be easily install by the system's package manager:
• Debian based systems:
```
sudo apt install mono-mcs
```
(there are also "mono-devel" and "mono-complete" packages, but it seems that "mono-mcs" is enough for us).
• Termux:
```
apt install mono
```
• MacOS,
```
brew install mono
```
If that fails, you might need to install mono from the mono-poject,
```
[https://www.mono-project.com/download/stable/#download-mac],
```
Create a directory for the exercise inside your repository, let's say "~/repos/ppnm/exercises/hello",
```
mkdir -p ~/repos/ppnm/exercises/hello
```
Go to your directory (remember to use the completion feature of your shell !):
```
cd ~/repos/ppnm/exercises/hello
```

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 -target:exe -out:hello.exe hello.cs # compile hello.cs, save bytecode in hello.exe
clean:                           # a phoney target, no dependencies
	rm -f Out.txt hello.exe  # remove secondary files

Create a file hello.cs with the following content,

class hello{
static int Main(){
	System.Console.WriteLine("Hello, World!");
	return 0;
	}
}

Run "make" and debug ;)

Hints

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

Alternatively, you can enable makefile syntax highlighting by adding the following line to your "~/.nanorc" file,

include /usr/share/nano/makefile.nanorc

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 := ;