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题目：

代码：

#import 
   
    typedef enum {kRed,kWhite,kGreen} Color;typedef enum {kSexMale,kSexFemale} Sex;@interface Dog : NSObject{
       @public    Color _color;    NSString *name;    int _weight;    Sex _sex;    int _speed;}-(void)eat:(NSString *) foodName;-(void)bark;-(void)run;-(Boolean)compareColor:(Dog *) dog;-(int)compareSpeed:(Dog *) dog;@end@implementation Dog-(void)eat:(NSString *) foodName{    NSLog(@"eat foodName %@",foodName);}-(void)bark{    NSLog(@"name=%@,weight=%d",name,_weight);}-(void)run{    _weight--;    NSLog(@"name=%@,weight=%d",name,_weight);}-(Boolean)compareColor:(Dog *) dog{    if (_color == dog->_color) {        //NSLog(@"相同");        return  true;    }else{        //NSLog(@"不同");        return  false;    }}-(int)compareSpeed:(Dog *) dog{    return _speed - dog->_speed;}@end#pragma mark -@interface Person:NSObject{
       @public    NSString *name;    Dog *dog;}-(void)feedDog:(Dog *)dog;@end@implementation Person-(void)feedDog:(Dog *)dog{    NSLog(@"person.name= %@,dog.name=%@",name,dog->name);}@endint main(int argc, const char * argv[]){    @autoreleasepool {        Dog *dog = [Dog new];        Dog *dog1 = [Dog new];        dog -> _speed = 70;        dog1 -> _speed = 50;        int res = [dog compareSpeed:dog1];        printf("%d\n",res);        dog->_color = kGreen;        dog1->_color = kWhite;        Boolean flag = [dog compareColor:dog1];        NSLog(@"flag = %d",flag);        Person *p = [Person new];        p->name = @"tom";        dog1->name = @"wangcai";        p->dog = dog1;        [p feedDog:dog1];    }    return 0;}
   

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