An assignment operator so we can do x=3+4.

This function implements the ICallbackEvaluation interface so that it handles setting the value of a variable.

Any Variable or function which implements the ILValue can appear on the left hand side of the equation.

public class Assign : PostfixMathCommand, ICallbackEvaluation

Public Class Assign _
	Inherits PostfixMathCommand _
	Implements ICallbackEvaluation

public ref class Assign : public PostfixMathCommand, 
	ICallbackEvaluation