Help With C++ Pointer Arrays Please

I understand arrays :

Code:

int x[3];

x[0] = 4;

i also understand pointers.

Code:

    int i = 5;
    int* pi;
    
    pi = &i;
    
    cout << pi << " " << *pi << endl;
// this will set the pointer pi == to i, which is 5. When you run it
//it will display first the address, then it will point to the contents
// of pi, which is 5. So it will display some address 5

I also understand pointer arithmetic,

Code:

int i[5];
    int* pi;
    
    i[2] = 4;
    pi = &i[0];
    
    cout << pi << " " << *(pi+2) << endl;
//this will display the address of i and then the contents of pi+2 which is i[2]

I have a finaly in a few days and I'm having difficulties

I cant seem to use cin with pointer arithemitic.
such as

Code:

 
int i=0;
cin.sync();
getline(cin,*(ptrX + i);

here is my code, I just began witting it, I'm not nearly done. It's a pre-Final.

Code:

#include <cstdlib>
#include <iostream>

using namespace std;
class Monsters
{
private: 
         string mName;
         string *monster;
         string eyeColor;
public:
       Monsters()
      { 
      }
      
      ~Monsters()
      {
      }
      
      void mBorn(int i = 0, string newMonster)
      {   
          *monster = newMonster;
          
          cout << "Name of your new monster: ";
          getline(cin,*(monster+i));
           
           i++;
           
      }
      
      void mEyeColor(string newEyeColor)
      {
      eyeColor = newEyeColor;
      
      cout << "What is the color of your monsters eyes?";
      cin >> eyeColor;
      }
};      

int main(int argc, char *argv[])
{
    
Monsters Test;
//the following is for testing purposes only, it calls the mBorn function, which doesn't run properly.
    int i;
    string x;
    Test.mBorn(i,x);

    system("PAUSE");
    return EXIT_SUCCESS;

}

I'm using Dev Bloodshed 4.9.9.2 (newest), my teacher requires it.

My program compiles, but doesn't run.