Programming Challenge 9.5 - Pointer Rewrite

/* Pointer Rewrite - The following function uses reference variables as
   parameters.
  
      int doSomething(int &x, int &y)
      {
         int temp = x;
         x = y * 10;
         y = temp * 10;
         return x + y;
      }

   This program demonstrates the function using pointers instead of
   reference variables. */

#include "Utility.h"

/* Function prototypes */
void getNumbers(int *, int *);
int doSomething(int *, int *);

int main()
{
   int varX = 0,
       varY = 0,
       result = 0;

   /* Pointer variables pointing to integers */
   int *x = nullptr;
   int *y = nullptr;

   /* Pointers x and y are storing the
      addresses of varX and varY */
    x = &varX;
    y = &varY;

    cout << "\n\t\t\tDo Something - Function Demonstration\n";

    cout << "\n\n\tIn Main Function:\n\n"
         << "\tThe initial value of variable varX is " << *x
         << " and its address in memory is " << x;

    cout << "\n\tThe initial value of variable varY is " << *y
         << " and its address in memory is " << y << "\n\n";

    /* Asks the user for two integer values */
    getNumbers(x, y);

    cout << "\n\n\tBack In Main Function:\n\n"
         << "\tThe new value of variable varX is " << *x
         << " and its address in memory is " << x;

    cout << "\n\tThe new value of variable varY is " << *y
         << " and its address in memory is " << y << "\n\n";   

    cout << "\n\tNow performing some calculations using your "
         << "numbers in doSomething() ...\n\n";

   /* Performs some calculations on the variables pointed to
      by *x and *y */
   result = doSomething(x, y);

   cout << "\n\tBack In Main Function:\n\n";

   cout << "\tThe new value of variable varX is " << *x
        << " and its address in memory is " << x;

   cout << "\n\tThe new value of variable varY is " << *y
        << " and its address in memory is " << y << "\n\n";

   cout << "\tThe result of the calculations performed "
        << "in doSomething() is: "
        << *x << " + " << *y << " = " << result << "\n\n";

   pauseSystem();
   return 0;
}


/* **********************************************************
   Definition: getNumbers

   This function accepts two pointers to integers as its
   arguments. It gets two values for x and y from the user.
   ********************************************************** */

void getNumbers(int *x, int *y)
{
   cout << "\n\tPlease enter two numbers:\n"
           << "\tx: ";
   cin >> *x;

   cout << "\ty: ";
   cin >> *y;
}

/* **********************************************************
   Definition: doSomething

   This function accepts to pointers as its arguments. Three
   calculations are performed:

      * x gets the result of multiplying the value pointed to
            by *y by 10
      * y gets the result of multiplying the value pointed to
            by *x assigned to temp by * 10
      * x pointing to valX and y pointing to valY are added
            and this result is returned.

   This final calculation is performed directly in the return
   statement.
   ********************************************************** */

int doSomething(int *x, int *y)
{
   int temp = *x;

   *x = *y * 10;
   *y = temp * 10;

   return (*x + *y);
}

Example Output: