On May 26, 2011, at 8:00 PM, Graham Cox wrote:
> I'm using random(), but every time I run my app I get the same sequence,
> despite having this code in my app delegate's -appDidFinishLaunching method.
> Clearly I'm not seeding it right, though I can't see why - I get a different
> value for seed every time. What gives?
>
>
> unsigned seed = (unsigned)([NSDate timeIntervalSinceReferenceDate] *
> 10000.0);
>
> NSLog(@"launched, seed = %ld", seed );
> srandom( seed );
unsigned seed = (unsigned)([NSDate timeIntervalSinceReferenceDate] *
10000.0);
sleep(2);
unsigned seed2 = (unsigned)([NSDate timeIntervalSinceReferenceDate] *
9999.0);
if (seed == seed2)
NSLog(@"match %u %u",seed,seed2);
else
NSLog(@"mismatch %u %u",seed,seed2);
2011-05-26 21:24:23.339 SRandom[885:80f] match 4294967295 4294967295
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