Need to know how fork works?

Question

I am trying the following C code:

int main()
{
    printf(\"text1\\n\");
    fork();
    printf(\"text2\\n\");
    return 0;
}

I was expect

Answer 1

Problem 1 : the output as
      text1
      text2
      text2

This is because fork() create exact copy (child) of parent process and both processes start their execution right after the system call fork().

Problem 2 : the output as
      text1text2 
      text1text2 

This is all about buffering. Refer this link and learn about fork() basics. http://www.csl.mtu.edu/cs4411.ck/www/NOTES/process/fork/create.html