// Program takes as input an integer between 1 and 20
// and prints a hollow square made up of * and blanks
// of the specified size
// Exercise 2.28 from D&D
#include<iostream.h>

main ()
{
  int size, col, row;

  // initialize
  size=0;

  // input square size -- make sure it is in bounds
  while (size < 1 || size > 20)
    {
      cout << "Input size of square (a number between 1 and 20): ";
      cin >> size;
    }

  cout << endl;
  // print top of square
  for (col = 1; col <= size; col++)
    cout << "*";
  cout << endl;

  // print internal square lines
  for (row = 2; row <= size - 1; row++)
    {
      cout << "*";
      for (col = 2; col <= size - 1; col++)
        cout << " ";
      cout << "*";
      cout << endl;
    }

  // print bottom of square
  for (col = 1; col <= size; col++)
    cout << "*";
  cout << endl;

  return 0;
}