// file: lecture_19/example.cc
//

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

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

  // declare a character string
  //
  char* str = (char*)"Alex";
  //  char *str = (char*)"Alex";
  char str1[5];
  strcpy(str1, str);
  //char* str1 = (char*)"Alex";
  fprintf(stdout, "the address of str1 is %p (%u)\n", str1, str1);
  fprintf(stdout, "the value of str1 is (%u) [%c]\n", str1, *str1);
  fprintf(stdout, "the value of str1 is (%u) [%c]\n", str1 + 1, *(str1+1));
  fprintf(stdout, "the value of str1 is (%u) [%c]\n", str1 + 2, *(str1+2));
  fprintf(stdout, "the value of str1 is (%u) [%c]\n", str1 + 3, *(str1+3));
  fprintf(stdout, "the value of str1 is (%u) [%d]\n", str1 + 4, *(str1+4));

  *(str1 + 2) = 0;
  fprintf(stdout, "modified str1 is [%s]\n", str1);
  
  //char str2[] = "Alex";
  //fprintf(stdout, "str2 = %s [%u] [%p]\n", str2, str2, str2);
  //char str[4]; str[0]='A';str[1]='l';str[2]='e';str[3]='x';

  fprintf(stdout, "str[0] = %c (%d)\n", str[0], str[0]);
  fprintf(stdout, "str[1] = %c (%d)\n", str[1], str[1]);
  fprintf(stdout, "str[2] = %c (%d)\n", str[2], str[2]);
  fprintf(stdout, "str[3] = %c (%d)\n", str[3], str[3]);
  //  fprintf(stdout, "str[4] = %c (%d)\n", str[4], str[4]);

  // note that argv[1] is a character string
  //
  fprintf(stdout, "argv[1] = %s (%p)\n", argv[1], argv[1]);
  /*

  //  char** x = argv;
  //fprintf(stdout, "x = %p (%u), argv = %p (%u)\n", x, x, argv[1], argv[1]);
  
  // float pointer
  //
  float x = (float)999.0;
  fprintf(stdout, "the value of x = %f\n", x);
  fprintf(stdout, "the address of x = %p (%u)\n", &x, &x);
  fprintf(stdout, "the value of a pointer = %f\n", *(&x));
  */

  float* v = new float[3];
  v[0] = 1.0;
  v[1] = -1.0;
  v[2] = 99.0;
  memset(v, 0, 3 * sizeof(float));
  fprintf(stdout, "v[0] (address %u) = %f\n", &v[0], v[0]);
  fprintf(stdout, "v[1] (address %u) = %f\n", &v[1], v[1]);

  float** w = new float*[3];
  w[0] = new float[99];
  w[1] = new float[33];
  w[2] = new float[19];
  w[99][12828283] = 27.27;
  w[1][15] = 27.27;
  w[2][18] = 27.27;
  fprintf(stdout, "address of w[0] = %u, value = %u\n", &w[0], w[0]);
  fprintf(stdout, "address of w[1] = %u, value = %u\n", &w[1], w[1]);
  fprintf(stdout, "address of w[2] = %u, value = %u\n", &w[2], w[2]);

  /*
  fprintf(stdout, "argv is located at %p (%u)\n", argv, argv);
  fprintf(stdout, "argv[0] is located at %p (%u)\n", &argv[0], &argv[0]);
  fprintf(stdout, "argv[0] value is %s\n", argv[0]);
  fprintf(stdout, "argv[0][0] value is %c\n", argv[0][0]);
  fprintf(stdout, "argv[0][1] value is %c\n", argv[0][1]);
  fprintf(stdout, "argv[1] is located at %p (%u)\n", &argv[1], &argv[1]);
  /*
  fprintf(stdout, "argv[1] value is %s\n", argv[1]);
  fprintf(stdout, "argv[1][0] value is %c\n", argv[1][0]);
  fprintf(stdout, "argv[1][1] value is %c\n", argv[1][1]);
  fprintf(stdout, "argv[1][3] value is %u\n", argv[1][3]);
  fprintf(stdout, "argv[1][4] value is %c %u\n", argv[1][4], argv[1][4]);
  */

  // exit gracefully
  //
  exit(0);
}


bool myfunct(float* x) {
  float* joe = new float[10];

  *x = 99.0; // changes the value of x in the calling program because it is a pointer
  return true;
}