// 
// Triangle
//
// Author     : K.J. Chan
// Date       : November 2008
// Language   : Java
// Description: This program checks to see if 3 numbers input by the user
//              represents a triangle and if so what sort of triangle
//
// Test Data  : 1 2 3 - not a triangle
//              1 1 1 - equilateral
//              3 4 5 - right angle triangle
//              3 2 2 - isosceles
//              3 3 2 - isosceles
//              4 5 6 - scalene

import java.util.Scanner ;

class triangleapp
{
    //////////////////////
    // Create an instance of the scanner for input
    //////////////////////
    static Scanner input = new Scanner ( System.in ) ;

    //////////////////////
    // method: get_positive_double
    //         get a positive double - keep looping until we do
    //////////////////////
    public static double get_positive_double() 
    {
        double number ;
        boolean err_condition ;

        do 
        {
            number = input.nextDouble() ;
            if ( err_condition = ( number <= 0.0 ) )
            {
                System.out.println( "Number entered is incorrect - " +
                                    "please input a +ve double" ) ;
            }
        } while ( err_condition ) ;

        return ( number ) ;
    }

    //////////////////////
    // method: main (the actual program)
    //////////////////////
    public static void main( String[] args ) 
    {
        //////////////////////
        // Declarations
        //////////////////////
        double side1, side2, side3 ;

        //////////////////////////////////////////
        // CONSTANTS
        //////////////////////////////////////////
        final int NOT_A_TRIANGLE =  0 ;
        final int EQUILATERAL    =  1 ;
        final int ISOSCELES      =  2 ;
        final int RIGHT_ANGLE    =  3 ;
        final int SCALENE        =  4 ;

        //////////////////////
        // get side1, side2 and side3 
        //////////////////////
        System.out.println( "Please input a number (double) for side 1" ) ;
        side1 = get_positive_double() ;

        System.out.println( "Please input a number (double) for side 2" ) ;
        side2 = get_positive_double() ;

        System.out.println( "Please input a number (double) for side 3" ) ;
        side3 = get_positive_double() ;

        System.out.printf( "the sides %4.2f %4.2f %4.2f ",
                           side1, side2, side3 ) ;

        triangle thisone = new triangle( side1, side2, side3 ) ;

        switch ( thisone.get_triangletype() )
        {
            case EQUILATERAL:
                System.out.println( "represent an equilateral triangle" ) ;
                break ;

            case ISOSCELES:
                System.out.println( "represent an isosceles triangle" ) ;
                break ;

            case RIGHT_ANGLE:
                System.out.println( "represent a right andgle triangle" ) ;
                break ;

            case SCALENE:
                System.out.println( "represent a scalene triangle" ) ;
                break ;

            default:
                System.out.println( "do NOT represent a triangle" ) ;
        }
    }
}