slogo.instruction

Class Back

java.lang.Object

slogo.GrammarElement

slogo.instruction.Instruction

slogo.instruction.Back

public class Back
extends Instruction

The Back instruction moves the turtle 10 steps in the opposite direction of its heading.

Field Summary

Fields

Modifier and Type	Field and Description
private GrammarElement	steps

Fields inherited from class slogo.GrammarElement

gelementsToValue

Constructor Summary

Constructors

Constructor and Description
Back(GrammarElement s) Represents a backwards command

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(Context c) Evaluate this language construct in some context.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

steps

private GrammarElement steps

Constructor Detail

Back

public Back(GrammarElement s)

Represents a backwards command

Parameters:

s -

Method Detail

evaluate

public java.lang.Object evaluate(Context c)

Description copied from class: GrammarElement

Evaluate this language construct in some context. The evaluation may have side-effects, e.g., moving a turtle.

Specified by:

evaluate in class Instruction

Parameters:

c - context in which the evaluation takes place

Returns:

the result of evaluating the construct

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object