Exercise "hello"

1. Build the hello world program -- a program that prints "Hello, World!" on the terminal.
   • Create a folder for the exercise, let's say "prog/hello": mkdir --parents ~/prog/hello.
   • Go to your directory: cd ~/prog/hello.
   • Create a file hello.c with the content

     #include "stdio.h"
     int main()
     {
             printf("hello, world\n");
     	return 0;
     }
     

   • Compile and link the program: cc hello.c -o hello.
   • Run the program: ./hello