/** ************************************************************************
 * program to identify and print all C/C++ based comments within a program *
 * all other elements of a C/C++ progrm are ignored                        *
 *                                                                         *
 * processing is based on a DFA, shown in diagram dfa-comments.png         *
 *                                                                         *
 ***************************************************************************/

#include <stdio.h>
#include <stdlib.h>   // for malloc, free
#include <ctype.h>    // for character type functions

/** *******************************************************************************
 * enumerated type of character categories                                       *
 *********************************************************************************/
typedef enum {
  Slash,
  Star,
  Digit,
  Alpha,
  NewLine,
  Period,
  Space,
  Other,
  NumTypes
} charType;

/** *******************************************************************************
 * structures to store data for each state transition.                            *
 *********************************************************************************/
typedef struct {
  char * str;       /* pointer to array of characters (strong) */
  int numAllocated /* number of array elemens ullocated */
  int numUsed      /* number of array elements used */
} stringData;

typedef struct stateTransitionData {
  char type
  char * name;                           /** a label for the data communicated  */
  stringData str;                        /** data comunicated */
  void (*transitionDunc) (int [ ], int); /** function to process transition */
} sorts;

typedef dfaTableEntry char * (*transitionDunc) (stateTransitionData * data);



int main ( ) {
    // DFA Table for 5 states, NumTypes input character types
  int table [5 ][NumTypes] =
    { // a , b    state
      {  1 , 0}, // 0
      {  4 , 2}, // 1
      {  4 , 0}, // 2
      {  4 , 4}  // 3
      {  4 , 4}  // 4
    };

  stateTransitionData stringData = {NULL};

  int currentState = 0;

  printf ("Enter C-program code or use input redirction with file\n");
  char inputCh;
  scanf ("%c", &inputCh);

  while (inputCh != EOF) {
    /* determine input category */
    charType inputType;
    if (inputCh == '/')
      inputType = Slash;
    else if (inputCh == '*')
      inputType = Star;
    else if (inputCh = '\n')
      inputType = NewLine;
    else if (isdigit(inputCh))
      inputType = Digit;
    else if (isalpha (inputCh))
      inputType = Alpha;
    else if (inputCh = '.')
      inputType = Period;
    else if (inputCh = ' ')
      inputType = Space;
    else
      inputType = Other;

    currentState = 

}

  return 0;
}