本人写的程序，搜索时错误识别不了，找了很久没找到问题所在，是编译器问题吗，求...

员理管帅最 · 发表于 2019-9-4 01:50:31

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x

#include<stdio.h>
#include<stdlib.h>
struct DATE
{
int year;
int math;
int day;
};
struct BOOK
{
  char title[128];
  char author[40];
  float price;
  struct DATE data;
  char pulic[40];
  struct BOOK* next;

};
void  luru(struct BOOK* x)
{
static int count=0;
count++;

for(int i=1;i<count;i++)
{ x=x->next;}

printf("请输入主题： ");
scanf("%s",x->title);
printf("请输入作者：");
scanf("%s",x->author);
printf("请输入价格： ");
scanf("%f",&x->price);
printf("请输入日期如(2017 3 14)：");
scanf("%d%d%d",&x->data.year,&(x->data.math),&(x->data.day));
printf("请输入出版社：");
scanf("%s",x->pulic);
//return x;
}
void daying(struct BOOK* x)
{
while(x!=NULL)
{
printf("主题：%s\n ",x->title);
printf("作者：%s\n ",x->author);
printf("价格：%. 2f\n",x->price);
printf("日期：%d-%d-%d\n ",x->data.year,x->data.math,x->data.day);

printf("出版社：%s\n ",x->pulic);
x=x->next;
}

}

/*struct BOOK* addhead(struct BOOK** p)
{
struct BOOK* team;
struct BOOK* book=NULL;
book=(struct BOOK*)malloc(sizeof(struct BOOK));
  if(book==NULL)
  {
printf("申请内存失败");
exit(EXIT_SUCCESS);
  }
else
  {
   team=*p;
  *p=book;
   book->next=team;
  }
  return *p;
}*/
struct BOOK* addlow(struct BOOK** p)
{
static struct BOOK* team;
struct BOOK* book=NULL;
book=(struct BOOK*)malloc(sizeof(struct BOOK));
  if(book==NULL)
  {
printf("申请内存失败");
exit(EXIT_SUCCESS);
  }
else
  {
   if(*p==NULL)
   {
   *p=book;
   book->next=NULL;
   }
else
{
  team->next=book;
  book->next=NULL;
}
team=book;
  }
  return *p;
}

void rest(struct BOOK*p)
{
  struct BOOK* am;
while(p!=NULL)
{
am=p;
p=p->next;
free(am);
}
}

struct BOOK*sousuo(struct BOOK*p,char*c)
{
while(1)
{
  if((!strcmp(c,p->title))||(!strcmp(c,p->author)))
{
return p;
}
  if(p==NULL)
  {
  return p;
  }
  p=p->next;
}
}
void sousuoresoult(struct BOOK*x,char*c)
{
if(x!=NULL)
{
  do
  {
printf("主题：%s\n ",x->title);
printf("作者：%s\n ",x->author);
printf("价格：%. 2f\n",x->price);
printf("日期：%d-%d-%d\n ",x->data.year,x->data.math,x->data.day);
printf("出版社：%s\n ",x->pulic);
x=x->next;
  }while(sousuo(x,c)!=NULL);
}
else
{
printf("搜索失败\n");
}
}

int main()
{
char ch,shu[80];
struct BOOK*p=NULL;
struct BOOK* dg;
while(1)
{
   do
   {
      printf("是否录入书籍(Y/N)：");
   }while((ch=getchar())!='y'&&ch!='n');
p=addlow(&p);
   luru(p);
getchar();
   do
   {
   printf("是否录入完毕(Y/N):");
   }while((ch=getchar())!='y'&&ch!='n');
if(ch=='y')
{
break;
}
getchar();
}
daying(p);
printf("请输入你想搜索的书如（作者/书名）：");
scanf("%s",shu);
dg=sousuo(p,shu);
sousuoresoult(dg,shu);

rest(p);
return 0;
}

superbe · 发表于 2019-9-4 11:18:01

本帖最后由 superbe 于 2019-9-4 11:24 编辑

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

struct DATE
{
int year;
int math;
int day;
};

struct BOOK
{
char title[128];
char author[40];
float price;
struct DATE data;
char pulic[40];
struct BOOK* next;
};

void luru(struct BOOK* x)
{
static int count=0;
count++;
for(int i=1;i<count;i++)
{
x=x->next;
}

printf("请输入主题： ");
scanf("%s",x->title);
printf("请输入作者：");
scanf("%s",x->author);
printf("请输入价格： ");
scanf("%f",&x->price);
printf("请输入日期如(2017 3 14)：");
scanf("%d%d%d",&x->data.year,&(x->data.math),&(x->data.day));
printf("请输入出版社：");
scanf("%s",x->pulic);
//return x;
}

void daying(struct BOOK* x)
{
while(x!=NULL)
{
printf("主题：%s\n ",x->title);
printf("作者：%s\n ",x->author);
printf("价格：%.2f\n",x->price); //去掉了%. 2f中间的空格
printf("日期：%d-%d-%d\n ",x->data.year,x->data.math,x->data.day);
printf("出版社：%s\n ",x->pulic);
x=x->next;
}
}

/*struct BOOK* addhead(struct BOOK** p)
{
struct BOOK* team;
struct BOOK* book=NULL;
book=(struct BOOK*)malloc(sizeof(struct BOOK));
if(book==NULL)
{
printf("申请内存失败");
exit(EXIT_SUCCESS);
}
else
{
team=*p;
*p=book;
book->next=team;
}
return *p;
}*/

struct BOOK* addlow(struct BOOK** p)
{
static struct BOOK* team;
struct BOOK* book=NULL;
book=(struct BOOK*)malloc(sizeof(struct BOOK));
if(book==NULL)
{
printf("申请内存失败");
exit(EXIT_SUCCESS);
}
else
{
if(*p==NULL)
{
*p=book;
book->next=NULL;
}
else
{
team->next=book;
book->next=NULL;
}
team=book;
}
return *p;
}

void rest(struct BOOK*p)
{
struct BOOK* am;
while(p!=NULL)
{
am=p;
p=p->next;
free(am);
}
}

struct BOOK* sousuo(struct BOOK *p,char *c)
{
while(1)
{
if(p==NULL) //两个if块交换了位置
{
return p;
}
if((!strcmp(c,p->title))||(!strcmp(c,p->author)))
{
return p;
}
p=p->next;
}
}

void sousuoresoult(struct BOOK *x,char *c)
{
if(x!=NULL)
{
do
{
printf("主题：%s\n ",x->title);
printf("作者：%s\n ",x->author);
printf("价格：%.2f\n",x->price); //去掉了%. 2f中间的空格
printf("日期：%d-%d-%d\n ",x->data.year,x->data.math,x->data.day);
printf("出版社：%s\n ",x->pulic);
x=x->next;
}while((x=sousuo(x,c))!=NULL); //原来是while(sousuo(x,c)!=NULL);
}
else
{
printf("搜索失败\n");
}
}

int main()
{
char ch,shu[80];
struct BOOK*p=NULL;
struct BOOK* dg;
while(1)
{
do
{
printf("是否录入书籍(Y/N)：");
}while((ch=getchar())!='y'&&ch!='n');
p=addlow(&p);
luru(p);
getchar();
do
{
printf("是否录入完毕(Y/N):");
}while((ch=getchar())!='y'&&ch!='n');
if(ch=='y')
{
break;
}
getchar();
}
daying(p);
printf("请输入你想搜索的书如（作者/书名）：");
scanf("%s",shu);
dg=sousuo(p,shu);
sousuoresoult(dg,shu);

rest(p);
return 0;
}

员理管帅最 · 发表于 2019-9-4 12:46:29

superbe 发表于 2019-9-4 11:18
#include
#include
#include

谢谢大哥

员理管帅最 · 发表于 2019-9-4 13:20:13

superbe 发表于 2019-9-4 11:18
#include
#include
#include

为什么要把两个if 调换位置呢，有什么不同吗，求大神指点

superbe · 发表于 2019-9-4 13:39:05

本帖最后由 superbe 于 2019-9-4 13:42 编辑

如果不交换位置，你只输一本书试下就会出错...
因为sousuoresoult里执行x=x->next后x=NULL，然后再执while()里的sousuo(x,c)，这行if((!strcmp(c,p->title))||(!strcmp(c,p->author)))就会出错(p=NULL)。

员理管帅最 · 发表于 2019-9-4 16:19:35

superbe 发表于 2019-9-4 13:39
如果不交换位置，你只输一本书试下就会出错...
因为sousuoresoult里执行x=x->next后x=NULL，然后再执while ...

谢谢大哥，明白了，我只考虑了条件不足是不不会执行if，没考虑到当p==NULL时，是不能执行p->... 。谢谢啦?

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