primetest2.frink

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use sieve.frink

// Test to check isPrime.
// This version uses a precalculated sieve.

// TODO: Profile this puppy and make it faster.

highest = 2^31 - 1;

sieve = array[sieve[floor[sqrt[highest]]]]

//println[sieve]

for n = 2 to highest
{
   if n % 10000 == 0
      print["$n\t"]
   
   if isPrimeByDivision[n, sieve] != isPrime[n]
      println["Error!  $n"];
}

isPrimeByDivision[n, sieve] :=
{
   for i = sieve
   {
      if (i >= n)
         return true;
      
      if (n mod i == 0)
         return false
   }

   return true
}
      


Download or view primetest2.frink in plain text format

This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 19967 days, 12 hours, 7 minutes ago.