// file: $(ECE_1111)/labs/01/l01_03/myprog.cc
//
// local include files
//
#include "myprog.h"

// declare a function
//
void foo(float* x) {
  *x = 99.0;
  x = new float[10];
  fprintf(stdout, "x is stored at %u\n", x);
}

// main: myprog
//
// This is a driver program that does some very simple things.
//

int main(int argc, const char** argv) {

  // declare a string array
  //
  char* str = (char*)"joe.txtxyxyxyxy";
  fprintf(stdout, "how big is str (%u)\n", sizeof(char*));
  fprintf(stdout, "the memory location is (%u)\n", str);

  // declare a numeric array
  //
  long N = 3;
  float x[N] = {1, 2, 3};
  float y[6][9][12];
  float* z = (float*)y;
  fprintf(stdout, "y begins at (%u)\n", (unsigned long)y);
  fprintf(stdout, "z begins at (%u)\n", (unsigned long)z);

  // dynamic memory allocation
  //
  float* alex = new float[99];
  fprintf(stdout, "alex is located at %u\n", alex);
  char* joe = (char*)new float[99];
  fprintf(stdout, "joe is located at %u\n", joe);

  memcpy(joe, alex, 4);

  /*
  fprintf(stdout, "alex[1] is located at %u\n", &alex[1]);
  fprintf(stdout, "joe[4] is located at %u\n", &joe[4]);

  delete [] alex;
  float joe = (unsigned long)(void*)alex;
  float* jordan = (float*)(unsigned long)joe;
  
  if (jordan != alex) {
    fprintf(stdout, "%u != %u\n", alex, jordan);
  }
  */

  // demonstrate a function
  //
  float sum = 27.0;
  foo(&sum);
  fprintf(stdout, "sum is stored at %u\n", &sum);
  //  fprintf(stdout, "sum = %f\n", sum);

  /*
  // declare a variable for status
  //
  FILE* fp = fopen(argv[1], "w");
  fprintf(fp, "x[0] = %10.4f\n", x[0]);
  fprintf(stdout, "number of elements written = %d\n",
	  fwrite(x, sizeof(float), N, fp));

  long i = N;
  while (i > 0) {
    i--;
    fprintf(stdout, "x[%d] = %f\n", i, x[i]);
  }

  fclose(fp);

  // copy x into y so that y is a *duplicate* of x
  //
  fprintf(stdout, "---> memory copy\n");
  float* y = new float[N];
  memcpy(y, x, sizeof(float)*N);
  x[2] = 27.0;
  fprintf(stdout, "x[%d] = %f\n", 2, x[2]);
  fprintf(stdout, "y[%d] = %f\n", 2, y[2]);

  // produce a copy of argv[]:
  //
  char* b[argc];
  char** c = new char*[argc];
  for (long i = 0; i< argc; i++) {
    //    b[i] = (char*)argv[i];
    b[i] = new char[strlen(argv[i]) + 1];
    strcpy(b[i], argv[i]);
  }
  fprintf(stdout, "note that b[0] != argv[0] (%u %u)\n", b[0], argv[0]);
  */

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