From: "Paul Ranson" 

It depends how random you want your results to be. 'rand' returns what
should be an even distribution between 0 and 32767, so a simple '%10' has a
slight bias away from 8 and 9, if you look at the second and third more
significant digits then they will have a bias towards 0 and also away from
7, 8, 9. If 'rand' returns 8 you will get 0, 0, 8 etc.

Paul

"Geo"  wrote in message
news:41b4ecad$1{at}w3.nls.net...
>> Another point, probably unimportant. You could extract the three
>> digits that you want from one call to rand, as below:
>>   int n = rand();
>>   itoa((n%10),a,10);
>>   itoa(((n/10)%10),b,10);
>>   itoa(((n/100)%10),c,10);
>
> See? Now that's the kind of stuff they never show you in a programming
> book.
> Now I'm going to have to do a whole new program just to play around with
> this and see exactly what it's doing so I can build my mental image.
>  That's really slick, it allows me to extract just one
> digit
> out of a number so if n=4581 then c ends up being the 5. Very handy
> technique, that was probably more useful than learning about itoa.
>
> Geo.
>
>

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