Sean Dennis wrote in a message to David Van Hoose:

 SD> ROT13 is a simple 'encryption' code (think of the 'Simple Caesar')
 SD> that people use in USENET to prevent joke punchlines and tv show
 SD> plot spoilers from being read until you're ready.  GoldEd also
 SD> supports this, but it's not encouraged to use this in FidoNet.
 SD> It's extremely easy to write a program that does the same thing. 

Anyhow, just in case:

/* Rot13 filter */

#include 
int main(void)
{
   int c,i;

   while ((c=fgetc(stdin))!=EOF)
   {
      if (c>='a' && c<='z')
         c = (((c-'a')+13)%26)+'a';
      else if (c>='A' && c<='Z')
         c = (((c-'A')+13)%26)+'A';
      fputc(c,stdout);
   }

   return 0;
}

greetings,
Tom
tomtorfs@village.uunet.be

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