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Re: [ID 20010305.005] "use integer" doesn't make rand() return integers

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From:
Philip Newton
Date:
March 7, 2001 01:56
Subject:
Re: [ID 20010305.005] "use integer" doesn't make rand() return integers
Message ID:
3AA613D5.735.7163DF@localhost
On 6 Mar 2001, at 14:08, John Peacock wrote:

> The problem comes when someone codes this:
> 
> use integer;
> for(;;) {
>         print rand;
> }
> 
> because this has no meaning.

I'd say it has the meaning: print(int(rand()) -- that is, using rand's 
default argument of 1. Of course, a function that always returns 0 is 
not very useful, but that's another thing.

> The range of integers 0..1 is not as easily derivable from rand()'s
> 0..0.999999999 (you'd have to use round). 

The set (0, 1) would be wrong as the output for int(rand()) or 
int(rand(1)) IMO -- rand() is defined to be rand(1) which is defined to 
give a value x with 0 <= x < 1. Hence, truncating that should always 
give 0.

Cheers,
Philip
-- 
Philip Newton <pnewton@gmx.de>
I appreciate copies of replies to my messages to Perl5 lists.

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