///////////////////////////////////////////////////////////////
//  exmp1i.cpp - arrays and pointers                         //
//  Jim Fawcett, ELE591\791, Su'99                           //
//  build: cl /GX exmp1h.cpp                                 //
///////////////////////////////////////////////////////////////

#include <iostream>  // C++ terminal I/O library
#include <iomanip>   // declaration of setw(..)
using namespace std;

void main( ) {
  
  cout << "\n  Demonstrating Arrays and Pointers  "
       << "\n =================================== ";
  cout << 
    "\n\n  Creating and displaying integer array using index:\n\n  ";

  const int size = 5;
  int intArray[size];
  int i;
  for(i=0; i<size; i++)
    intArray[i] = 2*i-3;

  for(i=0; i<size; i++)
    cout << intArray[i] << " ";
  
  cout << "\n\n  Accessing array elements using a pointer:\n\n  ";

  int *pInt;
  for(pInt = intArray; pInt != intArray+size; pInt++)
    cout << *pInt << " ";
    
  cout << 
    "\n\n  Creating and displaying array of structs using index:\n\n";

  struct arrayElem { int x; double y; char z; };

  arrayElem structArray[size];

  for(i=0; i<size; i++) {
    structArray[i].x = 2*i+5;
    structArray[i].y = i + 0.5;
    structArray[i].z = static_cast<char>(static_cast<int>('a') + i);
  }

  for(i=0; i<size; i++)
    cout << "  {" << setw(3) << structArray[i].x
         << ","   << setw(4) << structArray[i].y
         << ","   << setw(2) << structArray[i].z << " }\n";

  cout << "\n\n  Accessing array elements using a pointer:\n\n";

  arrayElem *pStructArray = structArray;
  for(i=size-1; i>=0; i--)
    cout << "  {" << setw(3) << (pStructArray + i) -> x
         << ","   << setw(4) << (pStructArray + i) -> y
         << ","   << setw(2) << (pStructArray + i) -> z << " }\n";
  cout << "\n\n";
}