text: /* reverse.h (alternative version)
   * version 1.2 (9 March 2019)
   *
   * A program by Richard Cavell
   * (c) 2017-2019
   *
   * https://github.com/richardcavell/reverse-c
   */
  
  #ifndef REVERSE_H
  #define REVERSE_H
  
  /* Possible error messages */
  #define RVRS_FAIL_MALLOC  2
  #define RVRS_FAIL_INPUT   3 /* not used by alternative version */
  #define RVRS_FAIL_OUTPUT  4 /* not used by alternative version */
  
  #endif
  