求助!为什么输入指令3后程序自动退出了,就是搜索功能那
求助! #include<stdio.h>#include<stdlib.h>
#include<string.h>
struct Date
{
int year;
int month;
int day;
};
struct Book
{
char title;
char author;
float price;
struct Date date;
char publisher;
struct Book*pnext;
};
void ReadBook(struct Book**pphead)
{
struct Book*book=(struct Book*)malloc(sizeof(struct Book));
printf("---开始录人书籍---\n");
getchar();
printf("请输入书名:");
gets(book->title);
printf("请输入作者:");
gets(book->author);
printf("请输入售价:");
scanf("%f",&book->price);
printf("请输入出版日期(按“ 2018-12-12 ”的格式输入):");
scanf("%d-%d-%d",&book->date.year,&book->date.month,&book->date.day) ;
getchar();//重要
printf("请输入出版社:");
//scanf("%s",book->publisher);
gets(book->publisher);
if(*pphead==NULL)
{
*pphead=book;
book->pnext=NULL;
}
else
{
struct Book*temp=*pphead;
while(1)
{
if(temp->pnext==NULL)
{
break;
}
temp=temp->pnext;
}
temp->pnext=book;
book->pnext=NULL;
}
}
void print_book(struct Book*phead)
{
struct Book *book=phead;
printf("\n---开始打印图书信息---\n");
if(phead==NULL)
{
printf("还未录入图书!\n");
}
else
{
while(1)
{
if(book==NULL)
{
break;
}
else
{
printf("书名:%s\n",book->title);
printf("作者:%s\n",book->author);
printf("售价:%.2f",book->price);
printf("出版日期:%d-%d-%d\n",book->date.year,book->date.month,book->date.day);
printf("出版社:%s\n",book->publisher);
putchar('\n');
book=book->pnext;
}
}
}
printf("\n---打印完毕---\n");
}
struct Book*SearchBook(struct Book*book)//搜索图书并返回指向该图书信息的指针,未找到则返回NULL
{
char inform;
printf("请输入搜索图书的的书名或作者:");
getchar(); //没有的话会异常退出
gets(inform);
while(1)
{
if(book=NULL)
{
return book;
}
if(!strcmp(book->title,inform)||!strcmp(book->author,inform))
{
return book;
}
book=book->pnext;
}
}
void print_search(struct Book*book) //打印被搜索的图书信息
{
if(book==NULL)
{
printf("未找到图书信息!\n");
}
else
{
printf("---你所寻找的图书信息如下---\n");
printf("书名:%s\n",book->title);
printf("作者:%s\n",book->author);
printf("售价:%.2f\n",book->price);
printf("出版日期:%d-%d-%d\n",book->date.year,book->date.month,book->date.day);
printf("出版社:%s\n",book->publisher);
}
}
void cutoff_book(struct Book*book)//删除被搜索的图书信息 ,并释放内存
{
char cutbook;
struct Book *pervious=NULL;
struct Book *current=book;
printf("请输入你要删除的图书的书名或作者:");
getchar();
gets(cutbook);
if(current==NULL)
{
printf("未找到需要删除的图书\n");
return; //返回
}
while(1)
{
if(!strcmp(current->title,cutbook)||!strcmp(current->author,cutbook))
{
break;
}
if(current==NULL)
{
break;
}
pervious=current;
current=current->pnext;
}
if(current==NULL)
{
printf("未找到需要删除的图书!\n");
}
else
{
pervious=pervious->pnext;
free(current);
}
}
void releasebook(struct Book*book)//释放链表空间
{
struct Book *temp=NULL;
while(book!=NULL)
{
temp=book;
book=book->pnext;
free(temp);
}
}
int main()
{
int N;
struct Book*phead=NULL;
// struct Book*searchbook;
putchar('\n');
printf("%46c图书管理系统\n",' ');
printf("\n\n");
printf("1 录入图书\n");
printf("2 打印已录入图书信息\n");
printf("3 搜素图书\n");
printf("4 删除已录入图书\n");
printf("5 退出程序\n");
printf(" \n\n ---输入功能前的相应序号进行操作---\n\n");
while(1)
{
printf("请输入指令:");
scanf("%d",&N);
putchar('\n');
switch(N)
{
case 1:ReadBook(&phead); break;
case 2:print_book(phead);break;
case 3:print_search(SearchBook(phead));break;
case 4:cutoff_book(phead);break;
case 5:releasebook(phead);exit(1);break;
defult:printf("指令错误\n");break;//?
}
putchar('\n');
}
} #include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct Date
{
int year;
int month;
int day;
};
struct Book
{
char title;
char author;
float price;
struct Date date;
char publisher;
struct Book*pnext;
};
void ReadBook(struct Book**pphead)
{
struct Book*book = (struct Book*)malloc(sizeof(struct Book));
printf("---开始录人书籍---\n");
getchar();
printf("请输入书名:");
gets(book->title);
printf("请输入作者:");
gets(book->author);
printf("请输入售价:");
scanf("%f", &book->price);
printf("请输入出版日期(按“ 2018-12-12 ”的格式输入):");
scanf("%d-%d-%d", &book->date.year, &book->date.month, &book->date.day);
getchar();//重要
printf("请输入出版社:");
//scanf("%s",book->publisher);
gets(book->publisher);
if(*pphead == NULL)
{
*pphead = book;
book->pnext = NULL;
}
else
{
struct Book*temp = *pphead;
while(1)
{
if(temp->pnext == NULL)
{
break;
}
temp = temp->pnext;
}
temp->pnext = book;
book->pnext = NULL;
}
}
void print_book(struct Book*phead)
{
struct Book *book = phead;
printf("\n---开始打印图书信息---\n");
if(phead == NULL)
{
printf("还未录入图书!\n");
}
else
{
while(1)
{
if(book == NULL)
{
break;
}
else
{
printf("书名:%s\n", book->title);
printf("作者:%s\n", book->author);
printf("售价:%.2f", book->price);
printf("出版日期:%d-%d-%d\n", book->date.year, book->date.month, book->date.day);
printf("出版社:%s\n", book->publisher);
putchar('\n');
book = book->pnext;
}
}
}
printf("\n---打印完毕---\n");
}
struct Book*SearchBook(struct Book*book)//搜索图书并返回指向该图书信息的指针,未找到则返回NULL
{
char inform;
printf("请输入搜索图书的的书名或作者:");
getchar(); //没有的话会异常退出
gets(inform);
while(1)
{
//if(book = NULL)
if(book == NULL)
{
return book;
}
if(!strcmp(book->title, inform) || !strcmp(book->author, inform))
{
return book;
}
book = book->pnext;
}
}
void print_search(struct Book*book) //打印被搜索的图书信息
{
if(book == NULL)
{
printf("未找到图书信息!\n");
}
else
{
printf("---你所寻找的图书信息如下---\n");
printf("书名:%s\n", book->title);
printf("作者:%s\n", book->author);
printf("售价:%.2f\n", book->price);
printf("出版日期:%d-%d-%d\n", book->date.year, book->date.month, book->date.day);
printf("出版社:%s\n", book->publisher);
}
}
void cutoff_book(struct Book*book)//删除被搜索的图书信息 ,并释放内存
{
char cutbook;
struct Book *pervious = NULL;
struct Book *current = book;
printf("请输入你要删除的图书的书名或作者:");
getchar();
gets(cutbook);
if(current == NULL)
{
printf("未找到需要删除的图书\n");
return; //返回
}
while(1)
{
if(!strcmp(current->title, cutbook) || !strcmp(current->author, cutbook))
{
break;
}
if(current == NULL)
{
break;
}
pervious = current;
current = current->pnext;
}
if(current == NULL)
{
printf("未找到需要删除的图书!\n");
}
else
{
pervious = pervious->pnext;
free(current);
}
}
void releasebook(struct Book*book)//释放链表空间
{
struct Book *temp = NULL;
while(book != NULL)
{
temp = book;
book = book->pnext;
free(temp);
}
}
int main(void)
{
int N;
struct Book*phead = NULL;
// struct Book*searchbook;
putchar('\n');
printf("%46c图书管理系统\n", ' ');
printf("\n\n");
printf("1 录入图书\n");
printf("2 打印已录入图书信息\n");
printf("3 搜素图书\n");
printf("4 删除已录入图书\n");
printf("5 退出程序\n");
printf(" \n\n ---输入功能前的相应序号进行操作---\n\n");
while(1)
{
printf("请输入指令:");
scanf("%d", &N);
putchar('\n');
switch(N)
{
case 1:ReadBook(&phead); break;
case 2:print_book(phead); break;
case 3:print_search(SearchBook(phead)); break;
case 4:cutoff_book(phead); break;
case 5:releasebook(phead); exit(1); break;
//defult:printf("指令错误\n"); break;//?
default:printf("指令错误\n"); break;//?
}
putchar('\n');
}
}
人造人 发表于 2018-12-22 12:18
你一点没改啊 费曼 发表于 2018-12-23 13:32
你一点没改啊
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