Write a calculator program to compute math equations using pipes - program needs to fork() as many times as needed and use pipes to communicate to children. Equation specified in the first line of the data file will determine this setup. Once the setup is done, parent task reads the data from the data file and pumps into various pipes in parallel and results come back to main task using another pipe. All tasks use standard input stream 0 to read the first argument, use stream 3 to read 2nd argument and use standard output stream 1 for output. Main task uses the pipe stream numbers directly since it needs standard I/O streams to communicate with the user.