# include & ltstdio.h & gt
# include & ltstdlib.h & gt
# include & ltstring.h & gt
# Definition number 100
Structural book
{
char booknum[8]；
char bookname[ 15]；
Char author [12];
Char pub [15];
char pub time[ 1 1]；
} book infor[NUM]；
Char initialization ()/* Interface initialization */
{
char ch
Printf(" * * * * * * * * * * Library Management System * * * * * * \ n1. Show all book information \n2. Add book information \n3. Delete book information \n4. Search for book information \n5. Exit \ nPlease select: ");
do
{
ch = getch()；
if(ch & gt； = ' 1 ' & amp； & ampch & lt='5')
{
printf("%c\n "，ch)；
getchar()；
Return ch;
}
} while( 1)；
}
Void showall()/* Show all */
{
int I = 0；
FILE * fp
System ("CLS");
if((fp=fopen("C:\\bookinfo.txt "，" r ")= = NULL)
{
Printf ("Error: Cannot open file \ n");
getchar()；
Return;
}
printf(" booknum bookname author pub house pub time \ n ")；
And (! feof(fp))
{Fred (& ampbookinfor[i], sizeof(struct book), 1, fp);
printf(" %-8s %- 15s %- 12s %- 15s %- 1 1s \ n "，bookinfor[i]。 booknum，bookinfor[i]。 bookname，bookinfor[i]。 Author, bookinfor[i]. PubHouse，bookinfor[i]。 pub time)；
i++；
If (! I %20)
{
Printf ("Press any key to continue ...");
getch()；
}
}
fclose(FP)；
Printf ("press any key to return");
getch()；
Return;
}
Voiddaddinfor ()/* Add data */
{
int i=0，b = 0；
char ch
FILE * fp
do
{
System ("CLS");
printf(" booknum:")；
Get (bookinfor[i]). booknum)；
Printf ("book name:");
Get (bookinfor[i]). Title);
Printf ("Author:");
Get (bookinfor[i]). Author);
printf(" pub house:")；
Get (bookinfor[i]). Pub);
printf(" pub time:")；
Get (bookinfor[i]). pub time)；
Printf ("Save! Continue? (Y/N)")；
do
{
ch = getch()；
if(ch = = ' Y ' | | ch = = ' Y ' | | ch = = ' N ' | | ch = = ' N ')
{
printf("%c\n "，ch)；
getchar()；
Break;
}
} while( 1)；
i++；
} while(ch = = ' Y ' | | ch = = ' Y ')；
if((fp=fopen("C:\\bookinfo.txt "，" a+")= = NULL)
{
Printf ("Error: Cannot open file \ n");
Return;
}
for(b = 0； B< me; b++)
if(fwrite(& amp； Bookinfor[b], sizeof, 1, fp)! = 1)
Printf ("file write error \ n");
fclose(FP)；
Return;
}
Voidlin for ()/* Delete information */
{
int i=0，b=0，k；
char delnum[8]；
FILE * fp
System ("CLS");
Printf ("Enter the deletion ISBN:");
gets(delnum)；
if((fp=fopen("C:\\bookinfo.txt "，" r ")= = NULL)
{
Printf ("Error: Cannot open file \ n");
Return;
}
And (! feof(fp))
{
Fred (& ampbookinfor[i], sizeof(struct book), 1, FP);
i++；
}
fclose(FP)；
for(b = 0； B< me; b++)
If (! strcmp(delnum，bookinfor[b].booknum))
{
for(k = b； k & ltI- 1； k++)
book infor[k]= book infor[k+ 1]；
if((fp=fopen("C:\\bookinfo.txt "，" w"))==NULL)
{
Printf ("Error: Cannot open file \ n");
Return;
}
for(I = 0； I & ltk；; i++)
if(fwrite(& amp； Bookinfor[i], sizeof (structural book), 1, fp)! = 1)
Printf ("file write error \ n");
fclose(FP)；
Printf ("Delete! Press any key to return ... ");
getchar()；
Return;
}
Printf ("Not found! Press any key to return ... ");
getchar()；
Return;
}
Void searchinfor()/* Find information */
{
char ch
char search book[20]；
int I = 0；
FILE * fp
System ("CLS");
Printf ("Search mode: \n 1. By book number \n2. Select by title: ");
do
{
ch = getch()；
if(ch==' 1'||ch=='2 ')
{
printf("%c\n "，ch)；
getchar()；
Break;
}
} while( 1)；
if((fp=fopen("C:\\bookinfo.txt "，" r ")= = NULL)
{
Printf ("Error: Cannot open file \ n");
Return;
}
if(ch==' 1 ')
{
Printf ("Enter ISBN:");
Get (search book);
printf(" booknum bookname author pub house pub time \ n ")；
And (! feof(fp))
{
Fred (& ampbookinfor[i], sizeof(struct book), 1, FP);
If (! strcmp(searchbook，bookinfor[i].booknum))
{
printf(" %-8s %-20s %- 15s %-25s %- 10s \ n "，bookinfor[i]。 booknum，bookinfor[i]。 bookname，bookinfor[i]。 Author, bookinfor[i]. PubHouse，bookinfor[i]。 pub time)；
Printf ("Press any key to return ...");
getchar()；
fclose(FP)；
Return;
}
i++；
}
}
if(ch=='2 ')
{
Printf ("Enter book name:");
Get (search book);
printf(" booknum bookname author pub house pub time \ n ")；
And (! feof(fp))
{
Fred (& ampbookinfor[i], sizeof(struct book), 1, FP);
If (! Strcmp(searchbook, bookinfor[i]. Book Name))
{
printf(" %-8s %-20s %- 15s %-25s %- 10s \ n "，bookinfor[i]。 booknum，bookinfor[i]。 bookname，bookinfor[i]。 Author, bookinfor[i]. PubHouse，bookinfor[i]。 pub time)；
Printf ("Press any key to return ...");
getchar()；
fclose(FP)；
Return;
}
i++；
}
}
System ("CLS");
Printf ("Not found! Press any key to return ... ");
fclose(FP)；
getchar()；
Return;
}
void main()
{
char ch
do
{
System ("CLS");
ch = initial ization()；
if(ch = = ' 1 ')showall()；
if(ch = = ' 2 ')add info()；
if(ch = = ' 3 ')delin for()；
if(ch = = ' 4 ')search infor()；
if(ch = = ' 5 ')break；
} while( 1)；
System ("CLS");
Printf ("Thank you for using it!" );
getchar()；
}