dev-cpp-users

[Dev-C++] rand()

[Artifiial S. <can...@ya...>]

HI, does anyone know a good way to use rnd() to generate non-repeating =
random numbers - in the area of about a thousand.  

RE: [Dev-C++] rand()

[Abhijit S. <mu...@gm...>]

Greets, Artificial Stupidity, I'm Real Happy (to meet you).

> HI, does anyone know a good way to use rnd() to generate non-repeating
random numbers - in the area of about a thousand.

	rand()%1000; // Gives a number from 0 - 999

Also, at the beginning of the program, do

	srand(time(NULL));

This is to initialize (seed) the random number so that you get different
sequences everytime you run the program.

HTH.
________________________________________

Abhijit Shylanath
http://mudeth.tripod.com/

RE: [Dev-C++] rand()

[Per W. <pw...@ia...>]

Note that rand()%x is not a good way of generating truly random numbers.
The pseudo-random numbers generated by most implementations of rand() have
bad randomness of the low bits.

There are a lot of cryptographic libraries with good random number
generators.

/Per W

On Thu, 19 Jun 2003, Abhijit Shylanath wrote:

>
> Greets, Artificial Stupidity, I'm Real Happy (to meet you).
>
> > HI, does anyone know a good way to use rnd() to generate non-repeating
> random numbers - in the area of about a thousand.
>
> 	rand()%1000; // Gives a number from 0 - 999
>
> Also, at the beginning of the program, do
>
> 	srand(time(NULL));
>
> This is to initialize (seed) the random number so that you get different
> sequences everytime you run the program.
>
> HTH.
> ________________________________________
>
> Abhijit Shylanath
> http://mudeth.tripod.com/
>
>
>
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RE: [Dev-C++] rand()

[Abhijit S. <mu...@gm...>]

Greets, Per.

> Note that rand()%x is not a good way of generating truly random numbers.
> The pseudo-random numbers generated by most implementations of rand() have
> bad randomness of the low bits.

On Unix, you can use /dev/rand, which generates random bytes based on user
action. But in case the user doesn't do anything, the call blocks. For a
continuous supply, you can use /dev/urand.

________________________________________

Abhijit Shylanath
http://mudeth.tripod.com/