prime.h File Reference

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Functions
int	IsPrime (int p)

Function Documentation

int IsPrime

(

int

p

)

Definition at line 61 of file prime.cc.

{
  if      (p == 0)    return 0;
  else if (p == 1)    return 1/*1*/;
  else if ((p == 2)||(p==3))    return p;
  else if (p < 0)     return 2; //(iiIsPrime0((unsigned)(-p)));
  else if ((p & 1)==0) return iiIsPrime0((unsigned)(p-1));
  return iiIsPrime0((unsigned)(p));
}