// pattern2.cpp

#include <iostream>

bool pattern(int rows);

int main()
{
   int patternCount = 0;
   cout << "How many rows?>";
   int rows;
   cin >> rows;
   while ( pattern(rows) )
   {
      patternCount++;
      cout << "How many rows?>";
      cin >> rows;
   }  // while
   cout << patternCount
        << " patterns have been displayed."
        << endl;
   return 0;
}  // function main

bool pattern(int rows)
{
   if ( rows < 1 || rows > 20 )
      return false;

   for ( int row = 0; row < rows; row++ )
   {
      int positionFirstAsterisk = 0;
      if ( row % 2 == 1 )
         positionFirstAsterisk = 2;

      for ( int column = 0; column < 2*rows; column++ )
      {
         if ( (column - positionFirstAsterisk) % 4 == 0 )
            cout << '*';
         else
            cout << ' ';
      }  // for column
      cout << endl;
   }  // for row

   return true;
}  // function pattern