← ppnm

Exercise "Hello, World!"

Tasks

  1. Install the C++ compiler on your system. There are two major open implementations of C++: g++ and Clang.

    • Debian based systems: 

    sudo apt install g++
    sudo apt install clang
    • Termux: 
    apt install Clang
    • MacOS: it seems that Clang is included in Xcode.

  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             # Out.txt depends on hello.exe
	./hello > Out.txt        # run hello.exe, send output to Out.txt
hello: hello.cc                 # hello depends on hello.cc
	clang++ -o hello hello.cc  # compile-and-link hello.cc, save executable in hello
clean:
	rm -f Out.txt hello
  5. Create a file hello.cs (hello.cc) with the following content,
    • hello.cs: 
    class hello{
static int Main(){
	System.Console.WriteLine("Hello, World!");
	return 0;
	}
}
    • hello.cc: 
    #include<iostream>
int main(){
	std::cout << "Hello, World!" << std::endl;
	return 0;
}
  6. Run "make" and debug ;)

Hints