// ** This class was generated with DemFGen (vers:02/05/2009)

package gen;

import edu.neu.ccs.demeterf.demfgen.lib.*;
import edu.neu.ccs.demeterf.*;


/** Abstract representation of Sign */
public abstract class Sign{
    /** Parse an instance of Sign from the given String */
    public static Sign parse(String inpt) throws ParseException{
        return new TheParser(new java.io.StringReader(inpt)).parse_Sign();
    }
    /** Parse an instance of Sign from the given Stream */
    public static Sign parse(java.io.InputStream inpt) throws ParseException{
        return new TheParser(inpt).parse_Sign();
    }
    /** Parse an instance of Sign from the given Reader */
    public static Sign parse(java.io.Reader inpt) throws ParseException{
        return new TheParser(inpt).parse_Sign();
    }

abstract boolean isPositive();

    /** DGP method from Class Display */
    public String display(){ return gen.Display.DisplayM(this); }
    /** DGP method from Class Print */
    public String print(){ return gen.Print.PrintM(this); }
    /** DGP method from Class ToStr */
    public String toStr(){ return gen.ToStr.ToStrM(this); }

}