The following C program

main()
{
    fork() ; fork() ; printf ("yes");
}

If we execute this core segment, how many times the string yes will be printed ?
(A) Only once
(B) 2 times
(C) 4 times
(D) 8 times


Answer: (C)

Explanation: Number of times YES printed is equal to number of process created. Total Number of Processes = 2ⁿ where n is number of fork system calls. So here n = 2, 2⁴ = 4

fork ();   // Line 1
fork ();   // Line 2

       P1      
    /     \     
  P1      C1    
 /  \    /  \   
P1  C2  C1  C3   
                

So, there are total 4 processes (3 new child processes and one original process).

Option (C) is correct.

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