You could use a piece of data with a very high entropy, like a very
volatile kernel structure, a time structure, etc. as a seed for your
code.
On Mon, Aug 1, 2011 at 1:25 PM, Puneet Gautam <puneet.nsi...@gmail.com> wrote:
> @Don: How about this below...?
>
> #include<stdio.h>
> int main(int argc,char *argv[])
> {
> int a;
> a=(argv[0]);
> printf("%d",a%10);
> getchar();
> }
>
> To get a random value b/w 0 to 100,
> we can use a%100
> and soon for 0-1000.....
>
>
> What say guys..?
>
>
> On 8/1/11, Don <dondod...@gmail.com> wrote:
>> That's actually a big question, because computers are deterministic,
>> so it is hard to see how they could act randomly.
>>
>> There are all sorts of pseudo-random generators which will produce a
>> stream of output which appear more or less random. The larger and more
>> sophisticated ones produce much better results than the poorly
>> designed ones. Decades ago there was a "random" generator called randu
>> which was notoriously bad, but before people figured out how flawed it
>> was, hundreds of simulation studies had been performed with it, and
>> most ended up being rejected as invalid based on the poor statistical
>> qualities of randu.
>>
>> Today there are several high-quality generators, such as the Mersenne
>> Twister. George Marsaglia has designed several excellent generators,
>> as well as the Diehard battery of tests to measure the statistical
>> quality of any generator.
>>
>> However, you seem to be wanting a single number which will be
>> different each time you run a program.
>>
>> You could do something as simple as
>>
>> int random_value = 2 + (time() % 9);
>>
>> Or you could pick any well-known random generator, seed it, and use it
>> to produce what you need.
>>
>> To get you started, this function will produce a pseudo-random stream
>> of output in the range 0..65535 using Marsaglia's "multiply with
>> carry" algorithm.
>>
>>
>> unsigned int mwc()
>> {
>> static unsigned int x = time(0);
>> x = 63663 * (x&65535) + (x>>16);
>> return x&65535;
>> }
>>
>> Don
>>
>> On Jul 31, 4:39 am, Puneet Gautam <puneet.nsi...@gmail.com> wrote:
>>> Can we write a code to generate random numbers without using rand
>>> function..?
>>>
>>> Pls help me on this!!
>>
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