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  1. // RPNCalculator.h
  2. #import <objc/Object.h>
  3. #import "Stack.h"
  4.  
  5. @interface RPNCalculator : Object
  6. {
  7.     Stack *stack;    /* RPNCalculator's stack  */
  8. }
  9. - (float)enter:(float)number;
  10. - (float)add:(float)number;
  11. - (float)add;
  12. - (float)subtract:(float)number;
  13. - (float)subtract;
  14. - allClear;
  15. - printStack;
  16. @end
  17.