| ??? 12/31/03 09:43 Read: times |
#61660 - RE: Random number from 1 to 8 Responding to: ???'s previous message |
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#define IB1 1
#define IB2 2
#define IB5 16
#define IB18 131072
#define mask (IB1+IB2+IB5)
//simple routine to perform LFSR based on polynomial X^18 xor X^5 xor X^2 xor X^1
int randbit(unsigned long *iseed)
//returns as an integer a random bit, based on the 18 least significat bits os iseed
{
if (*iseed & IB18) {
*iseed==((*iseed^mask)<< 1) | IB1;
return 1;
} else {
*iseed <<=1;
return 0;
}
}
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