//

//  main.m

//  结构体作为对象的属性

#import <Foundation/Foundation.h>

typedef struct {

    int year;

    int month;

    int day;

} Date;

@interface Student : NSObject

{

    @public

    NSString *_name;

    // struct Date birthday;

    Date _birthday;

}

- (void)say;

@end

@implementation Student

- (void)say

{

    NSLog(@"name = %@; year = %i, month = %i, day = %i", _name, _birthday.year, _birthday.month, _birthday.day);

}

@end

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

    Student *stu = [Student new];//结构体里面的值都是0

    stu->_name = @"lnj";

    // 1.结构体只能在定义的时候初始化

    // 2.系统并不清楚它是数组还是结构体

    //初始化结构体属性

    //方法一:强制转换

    stu->_birthday = (Date){, , };//大括号有可能是数组，

    //方法二:定义一个新的结构体,给d赋值,将d赋值给_birthday

    Date d = {, , };

    stu->_birthday = d;

    //方法三:分别赋值

    stu->_birthday.year = ;

    stu->_birthday.month = ;

    stu->_birthday.day = ;

    // 3.让学生说出自己的姓名和生日

    [stu say];

    Date d1  = {, , };

    Date d2;

    d2 = d1; // 本质是将d1所有的属性的值都拷贝了一份赋值给d;不是传递地址

    d2.year = ;

    printf("d1 = year = %i\n", d1.year);//

    printf("d2 = year = %i\n", d2.year);//

    return ;

}