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Previous Year Question (PYQs)

Assuming that the system call $fork()$ never fails, consider the following C programs $P1$ and $P2$ executed on a UNIX or Linux system:
Program $P1$ Program $P2$ 
/* P1 */int main() {    fork();    fork();    fork();    print("Happy\n");}
 
/* P2 */int main() {    fork();    print("Happy\n");    fork();    print("Happy\n");    fork();    print("Happy\n");}
Statement I: $P1$ displays "Happy" $8$ times.Statement II: $P2$ displays "Happy" $12$ times.In the light of the above statements, choose the correct answer from the options given below:




Solution

For program $P1$:

There are $3$ fork calls before the print statement.

Each $fork()$ doubles the number of processes.

So, total number of processes after $3$ fork calls is:

$2^3=8$

Each process executes the print statement.

Therefore, $P1$ displays "Happy" $8$ times.

So, Statement I is true.

For program $P2$:

Initially, there is $1$ process.

After first $fork()$:

Number of processes $=2$

So, first print statement executes $2$ times.

After second $fork()$:

Number of processes $=4$

So, second print statement executes $4$ times.

After third $fork()$:

Number of processes $=8$

So, third print statement executes $8$ times.

Total number of times "Happy" is printed:

$2+4+8=14$

So, $P2$ displays "Happy" $14$ times, not $12$ times.

Therefore, Statement II is false.

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