Yeah. I realized that, but my messages got reversed.
Thanks.
On Apr 19, 2012, at 4:51 PM, "Black, Michael (IS)" <michael.bla...@ngc.com>
wrote:
> You are correct that non-zero will be treated as true.
>
> That's more an accident then anything else as everybody is checking "!= 0"
> for true.
>
>
>
> But the values need to be consistent in the "not" cases too if you want to be
> safe about it. As I demonstrated in the code.
>
>
>
> You want this to hold true, otherwise you'll get into trouble.
>
>
>
> !!a == a
>
>
>
>
>
> #include <stdio.h>
> main()
> {
> int true1 = 1;
> int true2 = -1;
> printf("true = 1 OK? %s\n",(!!true1==true1)?"yes":"no");
> printf("true =-1 OK? %s\n",(!!true2==true2)?"yes":"no");
> }
>
> true = 1 OK? yes
> true =-1 OK? no
>
>
>
>
>
> Michael D. Black
>
> Senior Scientist
>
> Advanced Analytics Directorate
>
> Advanced GEOINT Solutions Operating Unit
>
> Northrop Grumman Information Systems
>
> ________________________________
> From: sqlite-users-boun...@sqlite.org [sqlite-users-boun...@sqlite.org] on
> behalf of Marc L. Allen [mlal...@outsitenetworks.com]
> Sent: Thursday, April 19, 2012 2:56 PM
> To: General Discussion of SQLite Database
> Subject: EXT :Re: [sqlite] "DEFAULT BOOLEAN NOT NULL" not working with
> entityframework
>
> I was under the impression that, in C, 0 was false, non-zero was true.
>
>> -----Original Message-----
>> From: sqlite-users-boun...@sqlite.org [<thismessage:/>mailto:sqlite-users-
>> boun...@sqlite.org] On Behalf Of Black, Michael (IS)
>> Sent: Thursday, April 19, 2012 3:15 PM
>> To: General Discussion of SQLite Database
>> Subject: Re: [sqlite] "DEFAULT BOOLEAN NOT NULL" not working with
>> entityframework
>>
>> Problem with true=-1.....
>>
>>
>>
>> !false=1
>>
>>
>>
>> So !false == true fails which can bite you in the behind
>> unexpectedly....
>>
>>
>>
>> true= 1
>> !true=0
>> true=-1
>> !true=0
>> !false=1
>> (true= 1 == !false) = 1
>> (true=-1 == !false) = 0
>>
>>
>>
>> #include <stdio.h>
>> main()
>> {
>> int true1=1;
>> int true2=-1;
>> int false=0;
>> printf("true= 1\n!true=%d\n",!true1);
>> printf("true=-1\n!true=%d\n",!true2);
>> printf("!false=%d\n",!false);
>> printf("(true= 1 == !false) = %d\n",true1==!false);
>> printf("(true=-1 == !false) = %d\n",true2==!false); }
>>
>>
>>
>>
>>
>> Michael D. Black
>>
>> Senior Scientist
>>
>> Advanced Analytics Directorate
>>
>> Advanced GEOINT Solutions Operating Unit
>>
>> Northrop Grumman Information Systems
>>
>> ________________________________
>>>> That is interesting to know, I tend to use -1 as true (misspent youth
>>>> dabbling in Forth on 8 bit machines).
>>
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