From: fv@nospam.tcenl.com   
      
   jaf.2k@ntlworld.com schreef:   
   > Hi I'm currently doing a password system. I've got it working. But I'd   
   > like to know how this bit works. I knew how my original password system   
   > worked as it was simple with no option to delete characters. I saw   
   > pieces of code on here that regarded deleting. The first IF section is   
   > fine, and I understand that, but how does dec(password[0]) work.   
   > Decrement the password variable with the [0] followed after it. What   
   > does the 0 mean? How does dec(password[0]) remove a character from the   
   > password string? I would be grateful if someone could tell me about   
   > this, it's probably very simple.   
   >   
   > IF (pass_char = #08) THEN   
   > BEGIN   
   > layout details blah blah blah   
   > remove asterisks   
   > put cursor back in right place ready for next character after deletion   
   > of previous character   
   >   
   >       IF length(password) > 0 THEN   
   >       BEGIN   
   >       dec(password[0]);   
   >       END;   
   >   
      
   It helps a lot to understand how a pascal string works.   
   A string declaration reserves 256 bytes on the heap.   
   It is actually an array [0..255] of char.   
   The length of the data contained in the string is stored in the 0th   
   byte, the data itself in bytes 1 to 255.   
      
   So decrementing Password[0] by one effectively removes the last char   
   from the string.   
      
   -- Femme   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)