21:06 提问
c，请帮我看看这个程序，怎么都找不到错误在哪，编译没问题调试一直出错
#define MAXTITL 40
#define MAXAUTL 40
#define MAXBKS 10
#define CONTINUE 0
#define DONE 1
struct book
char title[MAXTITL];
char author[MAXAUTL];
struct pack
bool delete_
char * s_gets(char *st, int n);
int getlet(const char *s);
int getbook(struct pack*pb);
void update(struct pack*item);
int main(void)
struct pack library[MAXBKS];
int count = 0;
int deleted = 0;
int index, filecount,
int size = sizeof(struct book);
if ((pbooks = fopen("book.dat", "r")) != NULL)
//无法读取内存？但这里我看了很多遍都没有问题呀
while (count & MAXBKS&&fread(&library[count], size, 1, pbooks) == 1)
if (count == 0)
puts("current contents of book.dat:");
printf("%s by %s:$%.2f\n", library[count].book.title,
library[count].book.author, library[count].book.value);
printf("do you wish to change or delete this entry?&y/n& ");
if (getlet("yn") == 'y')
printf("enter c to change,d to delete entry:");
if (getlet("cd") == 'd')
library[count].delete_me =
deleted++;
puts("entry marked for deletion.");
update(&library[count]);
fclose(pbooks);
filecount = count -
if (count == MAXBKS)
fputs("the book.dat is full.", stderr);
exit(EXIT_FAILURE);
puts("add new book titles.");
puts("press [enter] at the start of a line to stop.");
while (filecount & MAXBKS)
if (filecount & count)
while (library[open].delete_me == false)
if (getbook(&library[open]) == DONE)
else if (getbook(&library[open]) == DONE)
filecount++;
if (filecount & MAXBKS)
puts("enter the next book title:");
puts("here is the list of your book:");
for (index = 0; index & index++)
if (library[index].delete_me == false)
printf("%s by %s:$%.2f\n", library[index].book.title,
library[index].book.author, library[index].book.value);
if ((pbooks = fopen("book.dat", "w")) == NULL)
fputs("can't open book.dat for output.", stderr);
exit(EXIT_FAILURE);
for (index = 0; index & index++)
if (library[index].delete_me == false)
fwrite(&(library[index].book), size, 1, pbooks);
fclose(pbooks);
puts("done");
getchar();
int getlet(const char * s)
c = getchar();
while (strchr(s,c)==NULL)
printf("enter a character in the list %s\n", s);
while (getchar() != '\n');
c = getchar();
while (getchar() != '\n');
int getbook(struct pack * pb)
int status = CONTINUE;
if (s_gets(pb-&book.title,MAXTITL) == NULL || pb-&book.title[0] == '\0')
status = DONE;
puts("enter the author:");
s_gets(pb-&book.author, MAXAUTL);
puts("enter the value:");
while (scanf("%f", &pb-&book.value) != 1)
puts("use numeric input:");
scanf("%*s");
while (getchar() != '\n');
pb-&delete_me =
void update(struct pack * item)
copy = item-&
puts("enter the letter that indicates your choice:");
puts("t)modify title
a)modify author");
puts("v)modify value
s)saving changes");
puts("q)quit,ignore changes");
while ((c = getlet("tavsq")) != 's'&&c != 'q')
switch (c)
case't':puts("enter new title:");
s_gets(copy.title, MAXTITL);
case'a':puts("enter new author:");
s_gets(copy.author, MAXAUTL);
case'v':puts("enter new value:");
while (scanf("%f", &copy.value) != 1)
puts("enter a numeric value:");
scanf("%*s");
while (getchar() != '\n');
puts("enter the letter that indicates your choice:");
puts("t)modify title
a)modify author");
puts("v)modify value
s)saving changes");
puts("q)quit,ignore changes");
if (c == 's');
item-&book =
char * s_gets(char * st, int n)
char *ret_
ret_val = fgets(st, n, stdin);
if (ret_val)
find = strchr(st, '\n');
*find = '\0';
while (getchar() != '\n');
return ret_
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book.bat的路径写对了吗？这种写法应该是放在项目根目录下吧
pbooks指向的是空地址，无法获取内存值。
pbooks = fopen("book.dat", "r")) != NULL这句话应该是先赋值再判空吧？空的时候就异常了，不懂说得对不对，你试试看！电脑上没环境我就不尝试了。
r方式文件必须存在，你可以换成a+.我怀疑你看了假书
1、初始化指针，否则为野指针
FILE *pbooks=NULL;
2、if语句记得加｛｝后再写中间的代码，否则if和while作为一句执行
if ((pbooks = fopen("book.dat", "r")) != NULL)
//无法读取内存？但这里我看了很多遍都没有问题呀
while (count & MAXBKS&&fread(&library[count], size, 1, pbooks) == 1)
.............
应该是你第一次的 fclose(pbooks);的问题
因为如果第一次运行程序的时候，是不存在book.dat的。
所以pbook是没有指向文件的，然后你又释放文件——fclose(pbooks);
而pbook本身是没有指向文件的，所有释放不了导致出错。
应该把fclose(pbooks);放到 if 的中：
if ((pbooks = fopen("book.dat", "r")) != NULL)
//无法读取内存？但这里我看了很多遍都没有问题呀
while (count & MAXBKS&&fread(&library[count], size, 1, pbooks) == 1)
if (count == 0)
puts("current contents of book.dat:");
printf("%s by %s:$%.2f\n", library[count].book.title,
library[count].book.author, library[count].book.value);
printf("do you wish to change or delete this entry? ");
if (getlet("yn") == 'y')
printf("enter c to change,d to delete entry:");
if (getlet("cd") == 'd')
library[count].delete_me =
deleted++;
puts("entry marked for deletion.");
update(&library[count]);
fclose(pbooks);
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那位高手来帮我看看这条程序哪错了？收藏
#include &stdio.h&int main(){
int Centigrade , F Fahrenhite = printf("请输入 x "); scanf(%f",&x); Centigeade = ( x - 32 ) * 5 / 9; printf ("/d Fahrenhite\n" , Centigrade);
return 0 ;}
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"/d Fahrenhite\n"
最后的printf里面的/d改为%d试试看
#include &stdio.h&int main(){
int Centigrade , F Fahrenhite = printf("请输入 x "); scanf("%d",&x); Centigrade = ( x - 32 ) * 5 / 9; printf ("/d Fahrenhite\n" , Centigrade);
return 0 ;}
最后我修改成了这个但是执行后我输入数字后 却没有对应的数值
Fahrenhite =int
如果我是那x,我会疯的！
能执行了 但我输入41后并没有像公式一样算出是5
错误多多，都是低级错误
注意你的编译器提示
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这是我输入后 他的提示
x你声明成了一个char型的变量，又用%f来输入 Fahrenhite 变量没有使用正确的做法是变量使用float声明
注意输入输出参数要和变量类型一致
那我把char 改成float?
修改后输入数值 还是远来的情况
Fahrenhite 你也太抬举他了！
char=int 难道我又火星了？？？
我照着改了 还是不行
终于改好了
错误。。。。。
我觉得用VC++2010，就可以很好的提示你的基本错误
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