I agree, it just makes me think about it rather than rush over it assuming I know what I was thinking at the time. A personal thing. I would hope that the compiler sorts it out the same either way...
From: delphi-boun...@delphi.org.nz [mailto:delphi-boun...@delphi.org.nz] On Behalf Of Jolyon Smith Sent: Tuesday, 27 April 2010 12:34 p.m. To: 'NZ Borland Developers Group - Delphi List' Subject: Re: [DUG] Enable CheckBox Maybe it's just me, but "A doesn't equal B" surely reads more closely to the real meaning than "not (A does equal B)". Apart from anything else, the latter requires parentheses to avoid the compiler getting confused and trying to do : "(Not A) equals (B)". i.e. the latter syntax is also to the compiler less close to the real meaning (since it requires disambiguation). >From a human perspective the scanning is more fluid: A <> B, reads left to right entirely as intended: "A does not equal B". NOT (A = B) on the other hand requires me to read it like a syntax tree parser: "NOT " ... (OK, store the fact that I have to logically invert what follows, keep a mental note of parentheses) ... then what follows is "( A is equal to B )" , right OK, so "A is equal to B inverted", i.e. A does not equal B. In other words, exactly what is menat literally and clearly when I write... A <> B. But as I say, maybe it's just me. NOT (I think like a computer). ;) From: delphi-boun...@delphi.org.nz [mailto:delphi-boun...@delphi.org.nz] On Behalf Of David O'Brien Sent: Tuesday, 27 April 2010 11:54 a.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Enable CheckBox Mainly because it makes me think about the real meaning when looking at the code again J. From: delphi-boun...@delphi.org.nz [mailto:delphi-boun...@delphi.org.nz] On Behalf Of Colin Johnsun Sent: Tuesday, 27 April 2010 11:47 a.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Enable CheckBox I like David's version but why not get rid of the "not" to: DBCheckBox4.Enabled := DBEdit2.Text <> ''; Cheers, On 27 April 2010 09:40, Ian Drower <idro...@gmail.com> wrote: Hi Bob I'd use if DBEdit2.Text <> '' then DBCheckBox4.Enabled := true else DBCheckBox4.Enabled := false Ian On 27/04/2010 10:52 a.m., David O'Brien wrote: Why the four quotes in the false and a space in the true? I would use something like: DBCheckBox4.Enabled := not (DBEdit2.Text = '') ; From: delphi-boun...@delphi.org.nz [mailto:delphi-boun...@delphi.org.nz] On Behalf Of Bob Pawley Sent: Tuesday, 27 April 2010 10:39 a.m. To: NZ Borland Developers Group - Delphi List Subject: [DUG] Enable CheckBox Hi I am attempting to enable a checkbox only when a DBEdit has a value. (Disabled when no string in DBEdit.) Following is my code which disables the CheckBox after a delete from the DBEdit. But it is not enabled when I add a string to the DBEdit. ------ procedure TForm4.DBEdit2Change(Sender: TObject); begin if DBEdit2.Text = ' ' then DBCheckBox4.Enabled := True Else if DBEdit2.Text = '''' then DBCheckBox4.Enabled := False ; end; Thanks for any help. Bob _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: delphi@delphi.org.nz Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: unsubscribe _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: delphi@delphi.org.nz Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: unsubscribe
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