rand() in decimals.

Hi, I'm wondering how do I generate random numbers in decimals?
Meaning between 0-1.

Any ideas? rand() returns from the minimum of 1.

Read Prelude's article on Using rand(), in particular about creating a uniform deviate.

Thanks for the link, my mind must've slipped as this could also be done.

Code:

       float k = (rand()%10);
       k = k/10;

>float k = (rand()%10);
>k = k/10;
Apparently you didn't read the entire article. :P

I've always done it like so:

Code:

float frand(int chop, int perk = 10) {
   return (float(rand() % chop) * pow(10.0, float(perk))) / pow(10.0, float(perk));   }

Originally Posted by Yarin

I've always done it like so:

Code:

float frand(int chop, int perk = 10) {
   return (float(rand() % chop) * pow(10.0, float(perk))) / pow(10.0, float(perk));   }

You probably want to read (and understand) Prelude's page too - that is, if you care about the distribution of your random numbers. [And if you REALLY want good random numbers, don't use rand - as it's by no means guaranteed to be "good"].

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Mats

I did read it quite a while ago, but I figured out that rand() was producing pretty much the same thing as her version of rand(). All I have to do is call srand() every 1k calls to rand().

Originally Posted by Yarin

I did read it quite a while ago, but I figured out that rand() was producing pretty much the same thing as her version of rand(). All I have to do is call srand() every 1k calls to rand().

Calling srand again after calling it the first time will NOT improve the distribution of your sequence - it will restart the sequence with a different seed, and depending on the seed value, it may give you the same sequence as last time or a different sequence. But it won't make the distribution any better.

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Mats