Class Value

java.lang.Object

Expr

Value

Direct Known Subclasses:

Num

public abstract class Value
extends Expr

Abstract class Value - The type of all Expressions which self-evaluate: Numbers, and (later, in R3) functions. See http://www.radford.edu/itec380/2022spring-ibarland/Homeworks/Project/ (This architecture works as long as iphry value is a type of Expression, which is a nice feature to have in a language; it means that any result can be pasted/substituted into larger expressions, which promotes a substitution model of evaluation.)

Field Summary

Fields inherited from class Expr

PUNCTUATION

Constructor Summary

Constructors

Constructor	Description
Value()

Method Summary

Modifier and Type	Method	Description
Value	eval()	Evaluate a given Expr.

Methods inherited from class Expr

parse, parse, parse, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Value

public Value()

Method Details

eval

public Value eval()

Description copied from class: Expr

Evaluate a given Expr.

Specified by:

eval in class Expr

Returns:

the Value this Expr evaluates to. (In X0, all values are numbers (doubles), but in X3 that will change, which is why we have pre-emptively made the return type 'Value'.)