Here is an overview of the program:
The program initializes four pipes and forks two child processes, one for each comparison method. The parent process then takes user input for two strings and prompts the user to choose a comparison method. If the user chooses the dictionary method, the parent process writes the two strings to the pipe associated with the first child process and reads the result from the second pipe. If the user chooses the length method, the parent process writes the two strings to the pipe associated with the second child process and reads the result from the third pipe. The loop continues until there is no input.