creating child processes

From: Clunixchit (chitlesh_at_gmail-dot-com.no-spam.invalid)
Date: 05/27/05 

Date: Fri, 27 May 2005 07:45:58 +0000 (UTC)

am I lame ??
sounds like i didnt grab something !!!
whats wrong??
y for 2 loops, it prints 3 loops?

#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>

int main(){
   pid_t one, two;
   char A = 'A';
   char B = 'B';
   int i=0;

   int desc = open ("aba.txt", O_CREAT | O_RDWR , 0700
);
   if ( desc < 0 ) {
      perror ("open");
      exit(-1);
   }
   
   lseek(desc,0,sizeof(char));
   
   one = fork();

   switch ( one ) {
      case 0 : for(i=0;i<2;i++){
            write(desc,&A,sizeof(char));
           }
           exit(0);
          
      case -1 : perror("fork");
           exit(-1);
          
      default : waitpid(one,NULL,0);
           two = fork();
            if ( two == 0 ) {
               write(desc,&B,sizeof(char));
               waitpid(two,NULL,0);
            }
           close(desc);
           system("cat aba.txt");
           exit(0);
   }

}

in the end i wish to output ABABABABAB

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