Polymorphism: Same Name, Different Class

Program 9.1 shows the interface file for a class called Complex, which is used to represent complex numbers in a program.

Program 9.1 Interface File Complex.h

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// Interface file for Complex class#import <Foundation/Foundation.h>@interface Complex: NSObject@property double real, imaginary;-(void)   print;-(void)   setReal: (double) a andImaginary: (double) b;-(Complex *) add: (Complex *) f;@end

You should have completed the implementation section for this class in exercises 5 and 6 from Chapter 7, “More on Classes.” We added an additional setReal:andImaginary: method to enable you to set both the real and imaginary parts of your number with a single message and also synthesized ...

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