April 23, 2024

Belajar Bahasa C – ROT13

How can you tell an extrovert from an introvert at NSA? Va gur ryringbef, gur rkgebireg ybbxf ng gur BGURE thl’f fubrf.

I found this joke on USENET, but the punchline is scrambled. Maybe you can decipher it? According to Wikipedia, ROT13 (http://en.wikipedia.org/wiki/ROT13) is frequently used to obfuscate jokes on USENET.

Hint: For this task you’re only supposed to substitute characters. Not spaces, punctuation, numbers etc.

Test examples:

"EBG13 rknzcyr." -->
 "ROT13 example."

"This is my first ROT13 excercise!" -->
 "Guvf vf zl svefg EBG13 rkprepvfr!"


#include <string.h>

char *rot13(char *str_out, const char *str_in)
  // write to str_out and return it
  *str_out = '\0';

  char b;
  unsigned long i;
  for (i = 0; i < strlen(str_in); i++)
    b = str_in[i];
    if ((b >= 'A' && b <= 'M') || (b >= 'a' && b <= 'm'))
      b += 13;
    else if ((b >= 'N' && b <= 'Z') || (b >= 'n' && b <= 'z'))
      b -= 13;
    strncat(str_out, &b, 1);
  return str_out;

Rajo Intan

Blogger, pemiliki Onestring Lab, menulis artikel terkait teknologi informasi dan pendidikan. Web Developer, berpengalaman lebih dari 20 tahun mengembangkan berbagai aplikasi dan sistem informasi. Kerjasama kontak di onestringlab@gmail.com atau https://forms.gle/xAGKkpi6B3BzJyzk7

View all posts by Rajo Intan →

Leave a Reply

Your email address will not be published. Required fields are marked *

Ads Blocker Image Powered by Code Help Pro

Ads Blocker Detected!!!

We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.

Powered By
Best Wordpress Adblock Detecting Plugin | CHP Adblock