text: //
  //  NSDecimalNumber+CalculatingByString.h
  //
  //  Created by 余洪江 on 16/03/01.
  //  Copyright © MRJ. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  @interface NSDecimalNumber (CalculatingByString)
  
  + (NSDecimalNumber *)decimalNumberWithEquation:(NSString *)equation decimalNumbers:(NSDictionary *)numbers;
  
  @end
  