This question requires you to implement a user program in xv$6-$riscv. This program will

make use of system calls fork, pipe, read, and write.

Task: Write a user program in xv$6,$ name it pingpong. It should do the following:

$($a$)$ Create a child process.

$($b$)$ The parent will send an integer to this child process.

$($c$)$ Upon receiving this integer, the child process prints its PID followed by the value of

the integer it received.

$($d$)$ The child process should multiply the received integer by $4$ and send the resulting

integer back to the parent.

$($e$)$ The parent prints its PID followed by the value of the integer it received from the

child.

Example of usage:

$ pingpong

$4$ Integer from parent $=4$

$3$ Integer from child $=16$

Requirements: Communication between the parent and child process should be

through pipe. Your implementation must only establish a single pipe. Marks could be

deducted for lack of comments in your program.