slogo.instruction.arithmetic
Class Negation

java.lang.Object
  extended by slogo.language.GrammarElement
      extended by slogo.instruction.Instruction
          extended by slogo.instruction.arithmetic.UnaryExpression
              extended by slogo.instruction.arithmetic.Negation

public class Negation
extends UnaryExpression

Represents unary minus, e.g., -expression


Field Summary
 
Fields inherited from class slogo.instruction.arithmetic.UnaryExpression
myElement
 
Fields inherited from class slogo.language.GrammarElement
gelementsToValue
 
Constructor Summary
Negation(GrammarElement e)
           
 
Method Summary
 java.lang.Object evaluate(Context c)
          Evaluate this language construct in some context.
 java.lang.String toString()
           
 
Methods inherited from class slogo.instruction.arithmetic.UnaryExpression
value
 
Methods inherited from class slogo.instruction.Instruction
evaluateNumericExpression
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Negation

public Negation(GrammarElement e)
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.

Overrides:
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 UnaryExpression