slogo.instruction

Class ArithmeticInstruction

java.lang.Object

slogo.GrammarElement

slogo.instruction.Instruction

slogo.instruction.ArithmeticInstruction

Direct Known Subclasses:

BinaryExpression, UnaryExpression

public abstract class ArithmeticInstruction
extends Instruction

The base class of all arithmetic instruction, the evaluate method uses the hook/template method value to return a Double value, the template method returns a double.

Field Summary

Fields inherited from class slogo.GrammarElement

gelementsToValue

Constructor Summary

Constructors

Constructor and Description
ArithmeticInstruction()

Method Summary

Modifier and Type	Method and Description
java.lang.Double	evaluate(Context c) uses the hook/template method value to return a Double
abstract double	value(Context c)

Methods inherited from class java.lang.Object

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

Constructor Detail

ArithmeticInstruction

public ArithmeticInstruction()

Method Detail

evaluate

public java.lang.Double evaluate(Context c)

uses the hook/template method value to return a Double

Specified by:

evaluate in class Instruction

Parameters:

c - the context of the expression--may affect the value

Returns:

the result of evaluating the construct

value

public abstract double value(Context c)