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This is one of the more simple snippets I could actually write, and one of the best memorized pieces of code that I can actually write as the starting post of this blog. For interested bloggers who would want to be able to post their snippets here, contact me (Dean Michael Berris) through email (see page description for updated email information).

inline bool isprime(unsigned long int number)
{
  if (number <= 3)
    return true;

  if ((number % 2) == 0)
    return false;

  for (unsigned register int i = 5; i * i <= number; i+=2)
  {
    if ((number % i) == 0)
      return false;
  }
  return true;
}

Comments and optimizations most welcome.

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Related Blog Items

• where to place inline keyword, in definition or declaration?
• Do inline functions improve performance?
• Using the auto_ptr concept in C++
• How can inline functions help with the tradeoff of safety vs. speed?
• Inline functions & Macros comparision

This entry was written by Dean Michael C and posted on March 29, 2007 at 7:51 pm and filed under Algorithms, C Tidbits. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.