struct student
{
int num;
struct student *next;
};
第一个是用typedef 把 struct student 这个结构体类型名字重新定义为student，也就是说struct student和student表示同一个事物，都是一个类型的标识符，
比如 typedef int zhengshu; 就是你把整型int重命名为zhengshu，下面定义：int i; 和 zhengshu i; 两句就是等价的了
例程：
#define ListSize 10
typedef int DataType；
typedef struct{
DataType data【ListSize】；
int length；
}SeqList；
SeqList *L;
L->data =
L->length =
下面两个例程则是他们应用上的区别：
例1：不使用typedef，
//#include <apue.h>
#include <stdio.h>
#include <stdlib.h> //exit
#include <malloc.h>
#include <string.h>
struct pfilename{
char fn[20];
int fn_len;
char *pfn;
int pfn_len;
};
int
main(int argc, char **argv)
{
struct pfilename *pFhead;
pFhead = malloc(sizeof(struct pfilename));
strcpy(pFhead->fn,"iloveyou!");
pFhead->fn_len = strlen(pFhead->fn);
printf("pFhead->fn = %s,length = %d\n",(pFhead->fn),pFhead->fn_len);
//strcpy(pFhead->pfn,"iloveyou!");
pFhead->pfn = "iloveyou!!";
pFhead->pfn_len = strlen(pFhead->pfn);
printf("pFhead->pfn = %s,length = %d\n",(pFhead->pfn),pFhead->pfn_len);
return 0;
}
例2：使用typedef
#include <stdio.h>
#include <stdlib.h> //exit
#include <malloc.h>
#include <string.h>
typedef struct pfilename{
char fn[20];
int fn_len;
char *pfn;
int pfn_len;
}pfilename;
int
main(int argc, char **argv)
{
pfilename *pFhead;
pFhead = malloc(sizeof(pfilename));
strcpy(pFhead->fn,"iloveyou!");
pFhead->fn_len = strlen(pFhead->fn);
printf("pFhead->fn = %s,length = %d\n",(pFhead->fn),pFhead->fn_len);
//strcpy(pFhead->pfn,"iloveyou!");
pFhead->pfn = "iloveyou!!";
pFhead->pfn_len = strlen(pFhead->pfn);
printf("pFhead->pfn = %s,length = %d\n",(pFhead->pfn),pFhead->pfn_len);
return 0;
}
typedef struct student 和 struct student 的区别
原文：http://blog.csdn.net/u010597161/article/details/19199157