6. (20 points) Using Unix pipe() and C (or C++), write code to implement the fol

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6. (20 points) Using Unix pipe() and C (or C++), write code to implement the following system: The main process A creates a new process B; either A or B creates a third process C; then A, B or C creates a fourth process D. A reads a value X from stdin, adds 2 to X, sends X to C via a pipe. C adds 4 to X and sends it to D via a second pipe. B generates a random number Y and sends it D via a third pipe. D computes the product of X and Y (that is, x * Y), and prints out to sdout this sum. Write ([S)[.at, s'>tom);e.

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