Write a C program that proceed exactly in this order: 1. The main(parent) process creates a children C1. 2. The parent process prompts the user to enter an int n, then it sends n to C1 via pipe. 3....

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Extracted text: Write a C program that proceed exactly in this order: 1. The main(parent) process creates a children C1. 2. The parent process prompts the user to enter an int n, then it sends n to C1 via pipe. 3. The child C1 process computes Ei (the sum from 1 to n) and prints the result on the screen. 4. The parent waits till the C1 finish its execution in step 3. 5. After step4, the father process creates a new child that prints "Hi, I'm the second child". 6. Finally, the parent display "work is done thanks to el and c2". C1 P C2