Assignment: Write a simple program that uses the fork function. The new process created by fork is called the child process. The function is called once but returns twice. Both the child and the parent continue executing with the instruction that follows the call to fork. Here is a typical example: /* parent creates a process / pid fork(); * the return value is a process ID, that ALWAYS needs to be tested switch (pid) t case -1: / error: fork was unsuccessful / break; case o