What is the purpose of fork()?

Question

In many programs and man pages of Linux, I have seen code using fork(). Why do we need to use fork() and what is its purpose?

Answer 1

Fork() is used to create new processes as every body has written.

Here is my code that creates processes in the form of binary tree.......It will ask to scan the number of levels upto which you want to create processes in binary tree

#include 
#include 
#include   
int main() 
{
int t1,t2,p,i,n,ab;
p=getpid();                
printf("enter the number of levels\n");fflush(stdout);
scanf("%d",&n);                
printf("root %d\n",p);fflush(stdout);
for(i=1;i

OUTPUT

  enter the number of levels
  3
  root 20665
  child pid 20670   parent pid 20665
  child pid 20669   parent pid 20665
  child pid 20672   parent pid 20670
  child pid 20671   parent pid 20670
  child pid 20674   parent pid 20669
  child pid 20673   parent pid 20669