ios基础之1-类、方法、参数的声明

最新推荐文章于 2020-06-19 17:15:53 发布

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最新推荐文章于 2020-06-19 17:15:53 发布

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分类专栏： ios 文章标签： ios interface import class

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本文介绍了如何使用Objective-C创建一个Fraction类，该类用于表示分数并提供转换为数值的功能。通过实例化类并设置分子和分母，可以打印分数值。

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#import <Foundation/Foundation.h>
// The Fraction class

@interface Fraction : NSObject
{
  int numerator;
  int denominator;
}
-(void) print;
-(void) setNumerator:(int) d;
-(void) setDenominator: (int) d;
-(int) numerator;
-(int) denominator;
-(double) convertToNum;

@end



#import 'Fraction.h'
@implementation Fraction

-(void) print
{
 NSLog(@"%i/%i",numerator,denominator);
}

-(void) setNumerator:(int) n
{
  numerator=n;
}

-(void) setDenominator:(int) d
{
  denominator = d;
}

-(int) numerator
{
  return numerator;
}

-(int)denominator
{
 return denominator;
}
-(double)converToNum
{
 if(denominator !=0)
      return (double) numerator / denominator;
 else
 return 1.0;
}
@end



 #import 'Fraction.h' 

 int  main(int argc, char *argv[])
 {
  NSAutoreleasePool *pool =[[NSAutoreleasePool alloc] init];
  Fraction *myFraction =[[Fraction alloc] init];
  [myFraction setNumerator:1];
  [myPraction setDenominator:3];

  NSLog (@"The value of myFraction is:");
  [myFraction print];
  [myFraction release];
  [pool drain];
  return 0;
 }