//  Pyramids.java  (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2021-09-04  File created.


/*  This program demonstrates:
      - definition and calling of a static method
*/

import java.util.* ;

class Pyramids
{

   // Here we specify a static method that will be called later.
   // This method takes one parameter (argument)
   // The internal statements of the method will be executed only 
   // when it is called.
   
   static void print_pyramid( int desired_number_of_levels )
   {
      if ( desired_number_of_levels > 2 && desired_number_of_levels < 21 )
      {
         for ( int level_counter = 1 ;
                   level_counter <= desired_number_of_levels ;
                   level_counter ++ )
         {
            System.out.print( "\n" ) ;  // New line for new level
   
            // We'll print space characters so that the top of the pyramid will be
            // close to the character position 40.
   
            for ( int space_counter = 0 ;
                      space_counter < 40 - level_counter ;
                      space_counter ++ )
            {
               System.out.print( " " ) ; // print a single space character
            }
   
            // The body of the pyramid will consist of double characters "=="
   
            for ( int double_character_counter = 0 ;
                      double_character_counter < level_counter ;
                      double_character_counter ++ )
            {
               System.out.print( "==" ) ; // print double character
            }
         }
      }
      else
      {
         System.out.print( "\n  Number of pyramid levels not acceptable. \n" ) ;
      }
   
      System.out.print( "\n" ) ;
   }



   public static void main( String[] not_in_use )
   {
      Scanner  keyboard  =  new  Scanner( System.in ) ;

      // Here we make calls to the above static method
      
      print_pyramid( 18 ) ;  // print a pyramid with 18 levels
      print_pyramid( 10 ) ;  // print a smaller pyramid
   }
}