// file: lecture_12/example.cc
//
// a simple program to play around with data types, including
// pointers and arrays
//

// system include files
//
#include "example.h"

// function: main
//
// main program starts here
//
int main(int argc, char** argv) {

  /*
  FILE* fp = fopen(argv[1], "r");
  if (fp == (FILE*)NULL) {
    fprintf(stderr, "Ouch - an error has occurred\n");
    return -1;
  }

  short int buf[99];
  long nitems_read = fread(buf, sizeof(short int), 99, fp);

  fprintf(stdout, "number of items read = %d\n", nitems_read);

  fclose(fp);
  */
  
  /*
  char* x = "Joe";
  char* y = "Mary";
  char* z = strcat(x,y);
  */

  /*
  char* q = (char*)"Friday";
  fprintf(stdout, "... %s\n", q);
  */

  /*
  for (long i = 0; i < argc; i++) {
    fprintf(stdout, "arg[%d] = %s\n", i, argv[i]);
  }
  */

  char* ptr = (char*)"Joe";

  /*
  while (*ptr != (char)NULL) {
    fprintf(stdout, "value = %c\n", *ptr);
    ptr++;
  }
  */

  long len = strlen(ptr);
  fprintf(stdout, "len = %d\n", len);
  char* pp = ptr;
  for (long i = 0; i < len; i++) {
    fprintf(stdout, "ptr[%d] = %c\n", i, *pp);
    pp++;
  }

  /*
  for (; *ptr != (char)NULL; ptr++) {
    fprintf(stdout, "value = %c\n", *ptr);
  }
  */

  /*

  x[0] = (char*)"Joe";

  x[1] = new char[2];
  x[1][0] = 'a';
  x[1][1] = (char)NULL;

  x[2] = new char[strlen(argv[0]) + 1];
  strcpy(x[2], argv[0]);

  fprintf(stdout, "value = %c (%s) (%s)\n", x[1][0], x[1], x[2]);



  /*
  float sum = (float)27.2727;
  fprintf(stdout, "sum = %f (%ld)\n", sum, &sum);

  float* ptr_sum = &sum;
  //  fprintf(stdout, "sum = %f (%ld) (%ld)\n", *pp_sum, ptr_sum, &ptr_sum);

  //  char str[4] = "Joe";
  char* str = (char*)"Joe";
  char* pstr = str;

  long  i = 0;
  while (*pstr != (char)NULL) {
    fprintf(stdout, "%d: %c\n", i++, *pstr++);
    char* foo = str + pstr;
  }
  */
  
  // exit gracefully
  //
  return(0);
}