This is pretty easy to fix. You can use this or similar code:
if Key in ['0'..'9'] = false then
begin
key := #0;
showmessage('invalid value')
end;
Your specific case can be handled like this:
if ((key = 'o') or (key = 'O')) then key := '0';
Put this code in the KeyPress event of the edit box.
Good luck and have fun!
Joe Wilcox
"Reading Cliff Notes to know a novel is like eating Count Chocula to know steak"
"Nine women cannot have a baby in one month"
[EMAIL PROTECTED]
----- Original Message ----
From: Arsen Khachatryan <[EMAIL PROTECTED]>
To: delphi-en@yahoogroups.com
Sent: Monday, July 31, 2006 9:18:22 AM
Subject: [delphi-en] The Calculation
HI ALL FRIENDS,
I HAVE A EDIT BOXES FOR CALCULATE NUMBERS.FOR EXAMPLE
7:2 AND ETC. SOMETIMES THE SECOND VALUE WILL BE 0 AND WHEN THE USER PUTS A 0
FOR EXAMPLE 8+0 GIVES A ERROR THAT 0 IS NOT A INTEGER OR NUMBER.ANY EXAMPLE FOR
CALCULATION THAT CAN DO WITHOUT ERROR.FOR EXAMPLE IF THE SECOND VALUE IS 0 CAN
CALCULATE NORMAL AS 8+0=8??
THANKS A LOT FOR THE EXPERTS THAT THEY ARE HELPING THE BEGGINERS LIKE ME.
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