C 语言结构体使用

#include <stdio.h>
#include <string.h>

// 1. 定义一个结构体（先定义结构体再声明变量）
struct Student
{
	int no;
	char *name;
	char sex;
	float score;

};

// 2. 在定义结构体类型的同时声明结构体变量
struct Teacher
{
	int no;
	char *name;
	float salary;
} t1, t2;


// 3. 定义结构体直接声明结构体变量, 没有结构体类型名
struct
{
	char *plate_no; // 车牌号
	char *brand;	// 品牌
	float price;	// 售价
} car1, car2;


// 4. 通过 typedef 定义结构体
// typedef 数据类型 新名称
// 该结构体的类型为 struct OrderEntry, 该结构体的别名为 order
typedef struct OrderEntry
{
	int order_no;
	int total;
	float price;
} order;


struct Date
{
	int day;
	int month;
	int year;
};


// 5. 嵌套结构体定义
struct Person
{
	char name[50];
	struct Date birthday;
};



int main(int argc, const char *argv[])
{
	printf("--------students---------\n");
	struct Student stu1;
	stu1.no = 1;
	stu1.name = "steve";
	stu1.sex = 'M';
	stu1.score = 100;

	printf("no = %d, name = %s, sex = %c, score = %.2f\n", stu1.no, stu1.name, stu1.sex, stu1.score);

	printf("--------teachers---------\n");
	t1.name = "bob";
	t1.no = 1001;
	t1.salary = 10000;

	t2.name = "lisi";
	t2.no = 1002;
	t2.salary = 20005;

	printf("no = %d, name = %s, salary = %.2f\n", t1.no, t1.name, t1.salary);
	printf("no = %d, name = %s, salary = %.2f\n", t2.no, t2.name, t2.salary);

	printf("--------cars---------\n");
	car1.plate_no = "晋A69888";
	car1.brand = "BMW";
	car1.price = 598700;

	car2.plate_no = "京A88888";
	car2.brand = "Mercedes-Benz";
	car2.price = 1500000;

	printf("plate_no = %s, brand = %s, price = %.2f\n", car1.plate_no, car1.brand, car1.price);
	printf("plate_no = %s, brand = %s, price = %.2f\n", car2.plate_no, car2.brand, car2.price);


	printf("--------orders---------\n");
	// order 是 struct OrderEntry 的别名
	order ord1;
	ord1.order_no = 9001;
	ord1.total = 100;
	ord1.price = 900000;

	printf("order_no = %d, total = %d, price = %.2f\n", ord1.order_no, ord1.total, ord1.price);




	printf("--------people---------\n");
	struct Person p1;
	strcpy(p1.name, "张三");
	p1.birthday.year = 2005;
	p1.birthday.month = 9;
	p1.birthday.day = 20;

	printf("name = %s, birthday = %4d-%02d-%2d\n", p1.name, p1.birthday.year, p1.birthday.month, p1.birthday.day);






	return 0;
}