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GATE | GATE-IT-2004 | Question 64

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  • Difficulty Level : Easy
  • Last Updated : 28 Jun, 2021

A process executes the following segment of code :

 for(i = 1; i < = n; i++)

fork (); 

The number of new processes created is

 
(A) n
(B) ((n(n + 1))/2)
(C) 2n – 1

(D) 3n – 1


Answer: (C)

Explanation:

  fork ();    // Line 1
  fork ();   // Line 2
  fork ();   // Line 3
.....till n

       L1       // There will be 1 child process created by line 1
    /     \
  L2      L2    // There will be 2 child processes created by line 2
 /  \    /  \
L3  L3  L3  L3  // There will be 4 child processes created by line 3
........

We can also use direct formula to get the number of child processes.

With n fork statements, there are always 2n – 1 child processes. Also see this post for more details.

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