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

class triangle
{
    //////////////////////////////////////////
    // Declarations
    //////////////////////////////////////////
    private double S1  ;
    private double S2 ;
    private double S3  ;

    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 )
    {
        S1 = side1 ;
        S2 = side2 ;
        S3 = side3 ;
    }

    //////////////////////////////////////////
    // method: what_triangle_type
    //         work out what sort of triangle we have 
    //////////////////////////////////////////
    public int get_triangletype()
    {
        if ( S1 >= S2+S3 )
            return( NOT_A_TRIANGLE ) ;
        else if ( S2 >= S1+S3 )
            return( NOT_A_TRIANGLE ) ;
        else if ( S3 >= S1+S2 )
            return( NOT_A_TRIANGLE ) ;
        else if ( (S1 == S2) && (S2 == S3) )
            return( EQUILATERAL ) ;
        else if ( S1 == S2 )
            return( ISOSCELES ) ;
        else if ( S1 == S3 )
            return( ISOSCELES ) ;
        else if ( S2 == S3 )
            return( ISOSCELES ) ;
        else if ( S1*S1 == S2*S2 + S3*S3 )
            return( RIGHT_ANGLE ) ;
        else if ( S2*S2 == S1*S1 + S3*S3 )
            return( RIGHT_ANGLE ) ;
        else if ( S3*S3 == S1*S1 + S2*S2 )
            return( RIGHT_ANGLE ) ;
        else 
            return( SCALENE ) ;
    }
}