类的合理设计

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#import <Foundation/Foundation.h>typedef enum {//枚举   SexMan,    SexWoman}Sex;typedef struct {    int year;    int month;    int day;}Data;typedef enum {    ColorBlack,    ColorRed,    ColorGreen}Color;@interface Dog : NSObject{    @public    double weight;  //体重    Color curColor;  //毛色}- (void)run;- (void)eat;@end@implementation Dog- (void)eat{    //每吃一次，体重加1    weight += 1;    NSLog(@"狗吃完这次后的体重是%.2f",weight);}- (void)run{    weight -= 1;    NSLog(@"狗跑完这次后的体重是%.2f",weight);}@end/*学生成员变量：性别、生日、体重、最喜欢的颜色、狗(体重、毛色、吃、跑)方法：吃、跑步、遛狗（让狗跑）、喂狗（让狗吃）、*/@interface Student : NSObject{    @public    Sex sex;  //性别    Data birthday;  //生日    double weight;  //体重(kg)    Color favColor;  //最喜欢的颜色    char *name;        //重点    Dog *dog;//任何OC对象肯定是用指针来指的    }- (void)eat;- (void)run;- (void)print;- (void)liuDog;- (void)weiDog;@end@implementation Student- (void)liuDog{    //让狗跑起来（调用狗的run方法）    [dog run];}- (void)weiDog{    //让狗吃东西（调用狗的eat方法）    [dog eat];}- (void)print{    NSLog(@"性别=%d,喜欢的颜色=%d,姓名=%s,生日=%d-%d-%d",sex,favColor,name,birthday.year,birthday.month,birthday.day);}- (void)eat{    //每吃一次，体重加1    weight += 1;    NSLog(@"学生吃完这次后的体重是%.2f",weight);}- (void)run{    weight -= 1;    NSLog(@"学生跑完这次后的体重是%.2f",weight);}@endint main(){    Student *s = [Student new];    Dog *sdog = [Dog new];    sdog->curColor = ColorGreen;    sdog->weight = 20;    s->dog = sdog;//对象中又有对象        [s liuDog];    [s weiDog];                s->weight = 50;        //性别    s->sex = SexMan;        //生日    //s->birthday = {2011, 9, 10};错误        Data d ={1993 , 9 , 9};    s->birthday = d;        /*    s->birthday.year = 1993;    s->birthday.month = 9;    s->birthday.day = 9;    */        //姓名    s->name = "DaShu";        //喜欢的颜色    s->favColor = ColorBlack;    [s eat];    [s eat];        [s run];    [s run];        [s print];        return 0;}
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