// 
// triangle
//
// Author     : K.J. Chan
// Date       : Novermber 2008
// Language   : Java
// Description: triangle class
//

class triangle
{
    //////////////////////////////////////////
    // Declarations
    //////////////////////////////////////////
    private double small  ;
    private double medium ;
    private double large  ;

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

    //////////////////////////////////////////
    // Constructor
    //////////////////////////////////////////
    public triangle( double side1, double side2, double side3 )
    {
        double temp ;

        //////////////////////
        // sort numbers out into order
        // set them to small, medium and large
        // output the results (for testing)
        //////////////////////
        if ( side1 > side2 )
        {
            temp  = side1 ;
            side1 = side2 ;
            side2 = temp  ;
        }

        if ( side2 > side3 )
        {
            temp  = side2 ;
            side2 = side3 ;
            side3 = temp  ;
        }

        if ( side1 > side2 )
        {
            temp  = side1 ;
            side1 = side2 ;
            side2 = temp  ;
        }

        small  = side1 ;
        medium = side2 ;
        large  = side3 ;
    }

    //////////////////////////////////////////
    // method: what_triangle_type
    //         work out what sort of triangle we have 
    //////////////////////////////////////////
    public int get_triangletype()
    {
        if ( large < medium+small )
        {
            //////////////////////////////////////////
            // we have a triangle 
            //////////////////////////////////////////
            if ( large == small )
                return( EQUILATERAL ) ;
            else if ( (small == medium) || (medium == large) )
                return( ISOSCELES ) ;
            else if ( large*large == medium*medium + small*small )
                return( RIGHT_ANGLE ) ;
            else
                return( SCALENE ) ;
        }
        else
        {
            //////////////////////////////////////////
            // we DO NOT have a triangle 
            //////////////////////////////////////////
            return( NOT_A_TRIANGLE ) ;
        }
    }
}