Validation of postcode

How do I validate a postcode using TPW v1.5.
I want it to be validated as I enter each character and if the character is not valid then it should not be printed to the screen.
McSpudAsked:
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NanosCommented:
For this to work you must know the algorithm u want to check.. Then use a combination of "readkey" command, then show it using the write/writeln command.... readkey is a command is one of the headers, where it reads the entered valueinto a variable, without displaying it to the screen. If the variable matches certain criteria u can add it to a longer varible, and also show it on the screen!!
Hope it works for u!!
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NanosCommented:
I'm not being pushy.. but at least tell me where I went wrong???
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omsecCommented:
Hi

I'm npt familiar with TPW but in "normal" pascal (TP or BP) can you do that with a simple REPEAT - UNTIL - Loop  like this :

Program Test;

Uses
  Crt;   {or whatever in TPW}

Var
  KeyBoard  : Char;   {Get the key}

Begin
  Writeln;
  Writeln('hit keys as long you want to.');
  Writeln('''Q'', ''H'' and ''X'' will terminate program');
  Writeln;
  Repeat
    KeyBoard := ReadKey; {get key}
    KeyBoard := UpCase(KeyBoard); {make is caps}
    {do your wthings here}
    {all commands}
  Until (KeyBoard = 'Q') or (KeyBoard = 'H') or (KeyBoard = 'X');
End.

Hoping this could help, greets, Omsec :)
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McSpudAuthor Commented:
Sorry Nanos, but I was really looking for a bit of code to get me started. Omsec's code is too basic but I have now figured it out using a case statement and adding a character if it fits an if statement. Thanks for taking time to answer my question.
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