// 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* str1 = (char*)"Alex";
  //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];
  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[0][3] = 27.27;
  w[1] = new float[33];
  w[2] = new float[19];
  w[1][15] = 27.27;
  w[2][18] = 27.27;
  fprintf(stdout, "w[0] = %p\n", w[0]);

  fprintf(stdout, "argv is located at %p\n", argv);
  fprintf(stdout, "argv[0] is located at %p\n", 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\n", 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;
}