Defining the View Controller

Now, let’s write the code for the view controller class FCViewController. We start with the interface file Program 21.2.

Program 21.2 FCViewController.h Interface File

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#import <UIKit/UIKit.h>@interface FCViewController : UIViewController@property (strong, nonatomic) IBOutlet UILabel *display;-(void) processDigit: (int) digit;-(void) processOp: (char) theOp;-(void) storeFracPart;// Numeric keys-(IBAction) clickDigit: (UIButton *) sender;// Arithmetic Operation keys-(IBAction) clickPlus;-(IBAction) clickMinus;-(IBAction) clickMultiply;-(IBAction) clickDivide;// Misc. Keys-(IBAction) clickOver;-(IBAction) clickEquals;-(IBAction) clickClear;@end

There are housekeeping variables for building ...

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