CS193P Assignment 1 / Calculator / CalculatorBrain.h

//  CalculatorBrain.h
//  Calculator
//  Created by Jay Yu on 1/07/12.
//  Copyright (c) 2012 JayYu.com. All rights reserved.

#import <Foundation/Foundation.h>

@interface CalculatorBrain : NSObject

- (void)pushOperand:(double)operand;
- (void)pushVariable:(NSString *)variable;
- (double)performOperation:(NSString *)operation;
- (void)clearStates;
- (void)removeTopItemFromProgram;

// New in Assignment 2
@property (readonly) id program;
@property (nonatomic, strong) NSDictionary *variableValues;
+ (double)runProgram:(id)program
 usingVariableValues:(NSDictionary *)variableValues;
+ (NSSet *)variablesUsedInProgram:(id)program;
+ (NSString *)descriptionOfProgram:(id)program;

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