#include <unistd.h>
#include <stdio.h>

int main(){
  int i;
  pid_t pid = fork(); 
    if (pid == 0) {
      for (i=0; i<100; i++){
	printf("hello from child : pid=%i, i=%i\n", (int)pid, i); 
      }
    } 
    else {
      for (i=0; i<100; i++){
	printf("hello from parent : pid=%i, i=%i\n", (int)pid, i);
      }
    }
  return 0;
}