The Fraction Class

The Fraction class remains largely unchanged from earlier examples in this text. A new convertToString method was added to convert a fraction to its equivalent string representation. Program 21.2 shows the Fraction interface file followed immediately by the corresponding implementation file.

Program 21.2 Fraction.h Interface File

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#import <UIKit/UIKit.h>@interface Fraction : NSObject@property int numerator, denominator;-(void)          print;-(void)          setTo: (int) n over: (int) d;-(Fraction *)    add: (Fraction *) f;-(Fraction *)    subtract: (Fraction *) f;-(Fraction *)    multiply: (Fraction *) f;-(Fraction *)    divide: (Fraction *) f;-(void)          reduce;-(double)        convertToNum; ...

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