Programming

if(pid == 0)
{
        fprintf(stderr, "This is child %d\n", n);

        switch(n)
        {
        case 0:
                fprintf(stderr, "This happens only in child zero\n");
                break;
        case 3:
                fprintf(stderr, "This happens only in child three\n);
                break;

        default:
                fprintf(stderr, "Any other child just runs this\n");
                break;
        }

        exit(0); // So you don't accidentally continue the for-loop in the child
}

#include <stdio.h>  
#include<stdlib.h>
int main()
{
int parent=0, child=0, i=0, result, pid;
 pid = fork(); /* creates a new process, you only want the parent to spawn children? */
  for (i; i < 20; i++)
  {
	switch (pid)
   {
		 case -1:
			/* fork error */
			printf("Error occoured with fork()\n");
			exit(99);
		 case 0:
			/* child process */
			printf("child %d %d %d\n",getpid(), child++,getppid()); exit(0); 
		 default:
			 /* parent process*/
			{
			printf("parent %d %d\n", parent++, child);
			pid = fork(); /* fork new children here */
			wait();
			}
   }
  }
}