// Exp - a simple integer mathematical expression
// Eric McCreath 2018

public abstract class Exp {
    abstract int evaluate(); // calculate the value of the expression

    abstract String show(); // show an expression


    // In your solution you may only modify the static methods parse, parseExp, and parseTerm.
    // You may not modify the signatures of these methods.
    // You may not modify any other classes or methods.
    // You may not add any fields or methods to this abstract class.
    //<exp> ::= <term> | <exp> + <term> | <exp> - <term>
    //<term> ::= ( <exp> ) | <integer literal>
    public static Exp parse(Tokenizer t) throws ParseException {
        // add code in this method for your solution
        return null;
    }

    private static Exp parseExp(Tokenizer t) throws ParseException {
        // add code in this method for your solution

    }


    private static Exp parseTerm(Tokenizer t) throws ParseException {
        // add code in this method for your solution

    }

}