//  Calculate.java   Copyright (c) 2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2004-10-09  File created.
//  2005-11-19  Last modification.

//  As this is a program that can receive parameters from
//  the command line, this should be executed in a command
//  prompt window where the command line parameters can
//  be given. It may be difficult, and even impossible, to
//  supply the command line parameters if this program is 
//  executed with a modern development tool such as JCreator
//  or Eclipse.

//  This program will, though, ask for data from the user
//  if no command line parameters are given.

import java.util.* ;

class Calculate
{
   static void print_calculations ( int first_integer,
                                    int second_integer )
   {
      System.out.print( "\n    "  +  first_integer  +  " + "
                     +  second_integer  +  " = "
                     +  ( first_integer  +  second_integer ) 
                     +  "\n    "  +  first_integer  +  " - "
                     +  second_integer  +  " = "
                     +  ( first_integer - second_integer )
                     +  "\n    "  +  first_integer  +  " * "
                     +  second_integer  +  " = "
                     +  first_integer * second_integer ) ;

      if ( second_integer  !=  0 )
      {
         System.out.print( "\n    "  +  first_integer  +  " / "
                        +  second_integer  +  " = "
                        +  first_integer / second_integer
                        +  "\n    "  +  first_integer  +  " % "
                        +  second_integer  +  " = "
                        +  first_integer % second_integer  +  "\n" ) ;
      }
      else
      {
         System.out.print( "\n    Cannot divide with zero. \n" ) ;
      }
   }

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

      int  first_operand, second_operand ;

      if ( command_line_parameters.length  ==  2 )
      {
         first_operand   =  Integer.parseInt( command_line_parameters[ 0 ] ) ;
         second_operand  =  Integer.parseInt( command_line_parameters[ 1 ] ) ;

         print_calculations( first_operand, second_operand ) ;
      }
      else
      {
         System.out.print( "\n This program calculates with integers."
                        +  "\n Give two integers separated by a space:  " ) ;
         first_operand   =  keyboard.nextInt() ;
         second_operand  =  keyboard.nextInt() ;

         print_calculations( first_operand, second_operand ) ;
      }
   }
}