#include <stdio.h>#include <string.h>#include <stdlib.h> #define max 5struct books{    char title[20];    char author[20];    int price;};const char * fileName="books.txt";int size=sizeof(struct books);void read(struct books bks[]);void write(struct books bks[]);void list(struct books bks[]);void demo(struct books bks[]);void main(void){    struct books bks[max];        //write(bks);    read(bks);}void write(struct books bks[]){    FILE * fp;    int i=0;    int addList;    if((fp=fopen(fileName,"a+b")) == NULL)    {        printf("file open fail");     }        puts("大侠，你想添加几条数据?");    scanf("%d",&addList);        if(addList>0)    {        do{            printf("please add new book title\n");            scanf("%s",&bks[i].title);            printf("please add new book author\n");            scanf("%s",&bks[i].author);            printf("please add new book price\n");            scanf("%d",&bks[i].price);            i++;            fwrite(&bks[i],size,1,fp);        }while(i<addList);    }                    }void read(struct books bks[]){    FILE * fp;    int i=0;    if((fp=fopen(fileName,"r+")) == NULL)    {        printf("file open fail");     }        rewind(fp);        while( i<max && fread(&bks[i],size,1,fp) == 1)    {        printf("title is %s,author is %s,price is %d\n",bks[i].title,bks[i].author,bks[i].price);        i++;    }        }