GATE | GATE CS 2019 | Question 26

The following C program is executed on a Unix / Linux system:

#include <unistd.h>
  int main() {
    int i;
    for (i = 0; i < 10; i++)
      if (i % 2 == 0) fork();
    return 0;
  }

The total number of child process created is __________ .

Note – This was Numerical Type question.

(A) 31
(B) 63
(C) 5
(D) 6

Answer: (A)
Explanation: Condition “if” will be satisfy for i = 0, 2, 4, 6, 8 only. So, “fork()” will call for 5 times.

Total number of processes created is,

= 2number of fork()

There is always only one parent process of these processes and remaining will be child processes.

Hence number of child process created is,

= 2number of fork() - 1
= 25 - 1
= 32 - 1
= 31

So, option (A) is correct.
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