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  1.  
  2. /*
  3. **    Interface file for calculator exercise, lab #1    
  4. **    NeXT Technical Support
  5. */
  6.  
  7. #import <objc/Object.h>
  8.  
  9. #define STACKSIZE 20
  10.  
  11. @interface Calculator:Object
  12. {
  13.         id    aWindow;     /* main window in which calculator is drawn */
  14.     id    viewer;        /* calculator's simulated LCD display */
  15.     char    viewerStr[24];    /* string of digits to put in viewer */
  16.     double    stack[STACKSIZE];     
  17.     int    topOfStack;
  18.     BOOL    frozen;        /* flag to freeze calculator's functioning
  19.                   upon encountering an error, until 
  20.                   "clear" button is clicked */
  21. }
  22. +new;
  23. -(double)pop;
  24. -push:(double)aNum;
  25. -(double)getOperand;
  26. -displayValue:(double)aNum;
  27. -pushAndDisplay:(double)aNum;
  28. -enter:sender;
  29. -clearDisplay:sender;
  30. -digit:sender;
  31. -period:sender;
  32. -add:sender;
  33. -subtract:sender;
  34. -multiply:sender;
  35. -divide:sender;
  36. -changeSign:sender;
  37. -stackError:(STR)errorMsg;
  38. - setAWindow:anObject;    
  39. - setViewer:anObject;
  40. - windowWillClose:sender;             
  41. @end
  42.  
  43.