Object-C练习小程序(1)

以下是Object-C中对类的声明和定义：

#import <Foundation/Foundation.h>

@interface Fraction :NSObject          //声明Fraction类

-(void) print;

-(void) setNumerator : (int) n;

-(void) setDenominator : (int) d;       //实例方法

@end

@implementation Fraction         //实现Fraction类

{

   int numerator;

   int denominator;

}

-(void) print

{

    NSLog(@"%i/%i",numerator, denominator);

}

-(void) setNumerator:(int)n

{

   numerator = n;

}

-(void) setDenominator:(int)d

{

    denominator = d;

}

@end

int main(int argc,const char * argv[])

{

    @autoreleasepool {

  

       Fraction *myFraction = [[Fractionalloc] init];     //声明类对象并初始化

        

        [myFractionsetNumerator: 1];            //调用setNumerator接口

        [myFractionsetDenominator: 3];

        

        NSLog(@"The Value of myFraction is:");

        [myFractionprint];

    }

   return 0;

}

以上程序的输出结果：

2014-04-07 10:21:39.806 Object-Test[479:303] The Value of myFraction is:

2014-04-07 10:21:39.807 Object-Test[479:303] 1/3

Program ended with exit code: 0

其中黑色字体就是程序的输出部分。