wait() System call program - ubuntu

/* Wait for child termination - wait.c */
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>  // standard symbolic constant & types
#include<sys/types.h> // for datatype
#include<sys/wait.h> // for wait system call
main()
{
  int i,pid;
  pid = fork();
  if(pid < 0)
  {
   printf("\nProcess creation failure\n"); exit(-1);
  }
  else if(pid > 0)
  {
   wait(NULL);
   printf ("\nParent starts\nEven Nos:");
   for (i=2;i<=10;i+=2)
   printf("%3d",i);
   printf("\nParent ends\n");
  }
  else if(pid == 0)
  {
   printf ("\nChild starts\nOdd Nos:");
   for (i=1;i<10;i+=2)
   printf ("%3d",i);
   printf ("\nChild ends\n");
  }
}
output: