#import <Foundation/Foundation.h>

typedef struct{

    int year;

    int month;

    int day;

} MyDate;

typedef enum{

    GenderFemal,

    Gendermal

} Gender;

@interface Goods : NSObject

//已经做了set的内存管理

@property(nonatomic,assign)float price; // 单价

@property(nonatomic,assign)Gender gender; // 性别

@property(nonatomic,assign)float weight; // 重量

@property(nonatomic,copy)NSString *showImage; // 图片

@property(nonatomic,assign)MyDate produceDate; // 生产日期

@property(nonatomic,assign)MyDate expireDaer;  // 过期日期

// 卖家所卖的商品

@property(nonatomic,retain)Goods *goods;

@end

#import "Goods.h"

@implementation Goods

- (void)dealloc

{

    NSLog(@"商品被释放");

    [super dealloc];

}

@end

#import <Foundation/Foundation.h>

#import "Goods.h"

#import "Buyer.h"

#import "Seller.h"

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

    @autoreleasepool {

        // 创建商品

        Goods *g = [[Goods alloc] init];

        // 给商品属性赋值

        g.price = ;

        g.weight = ;

        g.showImage = @"/Users/apple/Desktop/1.png";

        g.produceDate = (MyDate){,,};

        g.expireDaer = (MyDate){,,};

        // 买家

        Buyer *buyer = [[Buyer alloc] init];

        buyer.name = @"小明";

        buyer.gender = GenderFemal;

        buyer.age = ;

        buyer.height = ;

        // 卖家

        Seller *seller = [[Seller alloc] init];

        seller.name = @"张三丰";

        seller.age = ;

        seller.height = ;

        seller.goods = g;

        // 释放对象

        [g release];

        [buyer release];

        [seller release];

    }

    return ;

}