C Tutor... C Tutorial....: Child process...Menu Program

#include 
#include 
#include 
main()
{
   int choice;
   do {
      printf("---------------=====00=====---------------");
      printf("

        Main Menu
");
      printf("Please select an option that you need:
");
      printf("    1. Executer ls command
");
      printf("    2. Execute ps command
");
      printf("    3. Execute who command
");
      printf("    0. exit
");
      printf("
Your choice: ");
      scanf("%d", &choice);
      //while (getchar() != '
');
      switch (choice){
          case 1:
               if (fork())
                  wait(0);
                else
                  execlp("ls", "ls", (char *)NULL);
                  break;
          case 2:
               if (fork())
                  wait(0);
               else
                  execlp("ps", "ps", (char *)NULL);
                  break;
          case 3:
               if (fork())
                  wait(0);
               else
                  execlp("who", "who", (char *)NULL);
                  break;
          case 0:
               break;
          default:
               printf("Please enter only 0-3
");
       }
   }
   while (choice != 0);
}

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History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming
language.