Question

Could you help me organize a dynamic array of points?

I have coped with a dynamic array of integers. But I don’t know
how to organize it with structures.

Here is my code so far…

#include "stdafx.h"
#include <cstdlib>;
#include <iostream>;
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
  int i = 0; // Array index.
  struct Point
  {
    int x;
    int y;
  };
  size_t n = sizeof(int);
  int * points = static_cast<int*>(malloc(n));
  char command;
  do
  {
    cout << "n - Create new point." << endl;
    cout << "q - Quit." << endl;
    cout << "Input a new command: ";
    cin >> command;
    if (command == 'n')
    {
      points[i] = 1;
      i++;
      /* points[i] = new Point();
         points[i].x = 1;
         points[i].y = 1; */
      // cout<<"("<<point1.x<<","<<point1.y<<")";               
    }               
    else if (command == 'q')
    {       
      for (int j = 0; j < i; j++)
        cout << points[j] <<endl;
      system("pause");
      return 0;
    }
    else
    {
      cout << "Please, enter a correct command." << endl << endl << endl;               
    }
  } while (true);
  system("pause");  
  return 0;
}

Answer 1

You can use vectors as @iedoc suggested:

#include <iostream>;
#include <vector>;

using namespace std;

struct SPoint
{
    int X;
    int Y;
};

int main()
{
    vector<SPoint> points;

    char command;
    do
    {
        cout << "n - Create new point." << endl;
        cout << "q - Quit." << endl;
        cout << "Input a new command: ";

        cin >> command;

        if (command == 'n')
        {
            int x = 0;
            int y = 0;

            cout << "X: ";
            cin >> x;

            cout << "Y: ";
            cin >> y;

            SPoint point = { x, y};
            points.push_back(point);
        }

        else if (command == 'q')
        {
            for (int i = 0; i < points.size(); ++i)
            {
                cout << "(" << points[i].X << "," << points[i].Y << ")";
            }

            return 0;
        }
        else
        {
            cout << "Please, enter a correct command."<<endl<<endl<<endl;
        }
    }

    while(true);

    return 0;
}