/typedef
#include"stdio.h"
#include "stdlib.h"
typedef   int   integer ;

#define   integers   int      // -->直接替换   
							  // #define ptrint int*  
							  // ptrint a,b;  -->  int *a ,b ;  
							  // but  the    typedef int *ptrint 
							  // ptrint a,b;  -->  iny *a ,*b;   两个东西的本质不同 
							  // typedef  相当于类型封装  define 相当于整体代换 
struct Data
{
	int year;
	int month;
	int day;
 };	  
 
typedef struct time
{
	int year;
	int month;
	int day;
 }TIME;	  


int main (void)
{	

/*
	integer a;
	integer b;
	
	a = 520;
	b = a;
	
	integers c;
	integers d;
	
	c = 500;
	d = c;
	
	
	printf("a = %d\n",a);
	printf("b = %d\n",b);
	printf("size of a = %d\n",sizeof(a));

	printf("a = %d\n",c);
	printf("b = %d\n",d);
	printf("size of a = %d\n",sizeof(c));
*/
	struct 	Data *data;

	data = (struct Data *)malloc(sizeof(struct Data));
	
	if(data == NULL)
	{
		printf("内存分配失败!\n");
		exit(1);
	}
	data->year = 2017;
	data->month = 5;
	data->day = 15;
	
	printf("%d-%d-%d\n",data->year,data->month,data->day);
	

	TIME time;
	//time = (TIME )malloc(sizeof(TIME));
		
//	if(time == NULL)
//	{
//		printf("内存分配失败!\n");
//		exit(1);
//	}
	time.year = 2018;
	time.month = 7;
	time.day = 18;
	
	printf("%d-%d-%d\n",time.year,time.month,time.day);
	
	
		TIME schedule;
	schedule = (TIME *)malloc(sizeof(TIME));
		
	if(schedule == NULL)
	{
		printf("内存分配失败!\n");
		exit(1);
	}
	schedule->year = 2018;
	schedule->month = 7;
	schedule->day = 18;
	
	printf("%d-%d-%d\n",schedule->year,schedule->month,schedule->day);
	return 0;
}

尝试了多种的tyepdef 的类型替换  ， 发现  schedule  不能够

使用MALLOC 函数来分配 大小 ，这钟操作也是很蠢的操作方式，sturct 的类型一生成 就会在内存钟产生内存对齐的空间分配，而malloc函数是针对指针的，它是使指针指向一大块的内存地址。所以上面代码的最下面是十分严重的错误和明显错误的代码， 

		TIME *schedule;
	schedule = (TIME *)malloc(sizeof(TIME));
		
	if(schedule == NULL)
	{
		printf("内存分配失败!\n");
		exit(1);
	}
	schedule->year = 2018;
	schedule->month = 7;
	schedule->day = 18;
	
	printf("%d-%d-%d\n",schedule->year,schedule->month,schedule->day);