//---------------------------------------------------
// Purpose: Example using functions and parameters (good design)
// Author:  John Gauch 
//---------------------------------------------------
#include <iostream>
using namespace std;

void draw_triangle(const int size)
{
   for (int row=0; row<size; row++)
   {
      for (int col=0; col<size; col++)
      {
         if (row>=col)
            cout << "*";
         else
            cout << " ";
      }
      cout << endl;
   }
}

void draw_letter_x(const int size)
{
   for (int row=0; row<size; row++)
   {
      for (int col=0; col<size; col++)
      {
         if ((row==col) || (row+col==size-1))
            cout << "*";
         else
            cout << " ";
      }
      cout << endl;
   }
}

void draw_box(const int size)
{
   for (int row=0; row<size; row++)
   {
      for (int col=0; col<size; col++)
      {
         if ((row==0) || (col==0) || (row==size-1) || (col==size-1))
            cout << "*";
         else
            cout << " ";
      }
      cout << endl;
   }
}

int main()
{
   int size = 0;
   cout << "enter size:\n";
   cin >> size;
   
   draw_triangle(size);
   draw_letter_x(size);
   draw_box(size);
}