What does fork() actually return?

Source code can be found here:
code-vault.net/lesson/c5746b1...
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[@vilijanac]

Child process continues from the the fork statement,
and what happens to memory is also interesting.
The child gets a copy of all the set values by the parent. Unless the variables are a pointers.
Is that correct?

[@CodeVault]

The child process gets a copy of all variables. Even pointers (although they might not point to what you expect them to)

[@vilijanac]

@@CodeVault I see, thanks, possibly point to the pointer,
to some shared memory which could be dangerous.

[@abhijitarun2415]

@CodeVault when a child is created it will have all lines of code that is below the fork() statement right?
but here fork() is assigned to id and its in the same line . so how does child id gets value 0?
if the child gets all the set values from parent then the id should be +ve ???

[@CodeVault]

Yes, the child process actually is a complete copy of the parent process. All that's different is what fork() actually returns

[@tendulkarzone8463]

could you pls explain why this code prints 4 times hello ?
int main() {
int pid, pid2;
pid = fork();
if (pid){
pid2 = fork();
printf("hello");
}
else {
printf("hello");
pid2 = fork();
}
return 0;
}

[@CodeVault]

Well, it should only print "hello" 3 times. Twice in the if(pid) and once in the else block

[@tendulkarzone8463]

@@CodeVault I also agree with your point but in some of the online compilers (eg: one compiler) it's actually printing "hello" 4 times. that's why confused.

[@CodeVault]

I tried it myself before replying and it only prints "hello" 3 times. Maybe it's using a previous version of the code?

[@tendulkarzone8463]

@@CodeVault that might be the reason