Self doubt

Question

#include<stdio.h>

int main()

{
fork() && fork ();

printf(“Forked”);

}

 

Explain the output of code with proper reason.

Comments

Forked ??

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@Raj Kumar 7

check all the links provided in the link to clearly understood the concept of fork() https://gateoverflow.in/251158/gatebook-2019-os1-15?show=276560#c276560

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@Magma

Won't "Forked" be printed thrice?

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Why ??

PID child process = 0

I think here no need to assign the PID  value  due to if condition  ??

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There is no if condition right?

Please correct me:

The 1st process will create 2 children one for the 1st fork() [i.e. before &&] and other for the 2nd fork().

The body of 1st child will have:

0 && fork();

printf("Forked");

The body of 2nd child will have:

0;

printf("Forked");

Will the 1st child create another child due to fork?

 

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There is no if condition right?

 I didn't saw that @ _ @ 

yes "forked "  be printed thrice

Answer 1

OUTPUT :

Forked

Forked

Forked

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REASON :

First fork() in boolean expression will create a child process with return value of 0, due to which child process won't evaluate condition after &&, will print Forked and exit.

The return value for the above fork() was 1 for parent process, due to which parent process will evaluate condition after &&, which is again fork() creating one more child process. This newly created child process will print Forked and exit.

The parent process too will exit by printing Forked.

Hence the output contains Forked printed thrice. 

 

Comments

Which one is the conditional statement?

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The boolean expression I meant. Corrected.