看OC视频，遇到问题 - 黑马程序员技术交流社区

/* 学生
*/
#import <Foundation/Foundation.h>
typedef enum
{
SexMan,
SexWoman
}Sex;
typedef struct
{
int year;
int mouth;
int day;
}Date;
typedef enum
{
ColorBlack,
ColorRed,
ColorGreen
}Color;
@interface Dog : NSObject
{
@public
double weight;
Color curColor;
}
-(void)eat;
-(void)run;
@end
@implementation Dog
- (void) eat
{
weight+=1;
NSLog(@"狗吃完这次后体重是%f",weight);
}
- (void) run
{
weight-=1;
NSLog(@"狗跑完这次体重是%f",weight);
}
@end
@interface Student : NSObject
{
@public
Sex sex;
Date birthday;
double weight;
Color favColor;
char *name;
Dog *dog;
}
- (void)eat;
- (void)run;
- (void)print;
- (void)liuDog;
- (void)weiDog;
@end
@implementation Student
- (void) eat
{
weight+=1;
NSLog(@"吃完这次后体重是%f",weight);
}
- (void) run
{
weight-=1;
NSLog(@"跑完这次体重是%f",weight);
}
-(void) print
{
NSLog(@"性别=%d, 颜色=%d, 生日=%d-%d-%d 姓名%s",sex,favColor,birthday.year,birthday.mouth,birthday.day,name);
}
- (void)liuDog
{
[dog run];
}
- (void)weiDog
{
[dog eat];
}
@end
int main()
{
Student *s = [Student new];
//Dog *d = [Dog new]; 这是视频中的写法，给类中的类赋值，必须用这种方式？？
//d->curColor = ColorGreen;
//d->weight = 20;
//s->dog = d;
s->dog->weight = 100;
s->dog->curColor = ColorGreen;
[s liuDog];
[s weiDog];
return 0;
}

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