c/c++将结构体读入到文件中，然后读出

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

typedef struct
{
char name[20];
char num[20];
int age;
}Stu,*pStu;

void write()
{
FILE *file;
Stu Stu1;
if((file=fopen("C:\\123","wb"))==NULL)
{
printf("open file failed!\n");
exit(0);
}

strcpy(Stu1.name,"张三");
strcpy(Stu1.num,"09111626");

Stu1.age=19;

fwrite(&Stu1,sizeof(Stu),1,file);

fclose(file);

}

void read()
{
FILE *file;
if((file=fopen("C:\\123","rb"))==NULL)
{
printf("open file failed!\n");
exit(0);
}
Stu Stu2;
fread(&Stu2,sizeof(Stu),1,file);
fclose(file);
printf("name=%s,age=%d,num=%s\n",Stu2.name,Stu2.age,Stu2.num);
}

//void write()
//{
// FILE *file;
// if((file=fopen("C:\\123","wb"))==NULL)
// {
// printf("open file failed!\n");
// exit(0);
// }
// pStu p;
// strcpy(p->name,"张三");
// strcpy(p->num,"09111626");
//
//
// p->age=19;
//
// fwrite(p,sizeof(struct Student),1,file);
//
// fclose(file);
//
//
//}
//
//void read()
//{
//FILE *file;
// if((file=fopen("C:\\123","rb"))==NULL)
// {
// printf("open file failed!\n");
// exit(0);
// }
//pStu p1;
// fread(p1,sizeof(struct Student),1,file);
// fclose(file);
// printf("name=%s,age=%d,num=%s\n",p1->name,p1->age,p1->num);
//}
void main()
{
write();
//read();

/* printf("%d\n",sizeof(struct Student));*/

//printf("%d\n",sizeof(Stu1));
}