C: A true random number generator: Difference between revisions
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{ | { | ||
unsigned __int64 i; | unsigned __int64 i; | ||
i = __rdtsc(); | i = __rdtsc(); | ||
do | do | ||
i=(int)rand()%iMax; | i=(int)rand()%iMax; | ||
while (i < iMin); | while (i < iMin); | ||
return (int)i; | return (int)i; | ||
} | } | ||
Revision as of 06:09, 30 April 2018
This random number generator is about as close as it gets to being truly random. It works by using the number of CPU cycles from startup as the seed.
#include <intrin.h> #pragma intrinsic(__rdtsc)
int getRand(int iMin,int iMax)
{
unsigned __int64 i;
i = __rdtsc();
do
i=(int)rand()%iMax;
while (i < iMin);
return (int)i;
}
