# contains "stdio.h"
# contains "stdlib.h"
# contains "conio.h"
# contains "string.h"
# contains "math.h"
#define LEN sizeof (structure library)
#define LEN 1 sizeof (structure reader)
# Define NULL 0
Structure library//library structure
{int shuhao, xcl
Character name [20], author [20], publisher [20];
Structure library * next
};
Structure reader//reader structure
{
Within Zheng Hao;
Xia Erziming [20], Riqi [20], Zname [20];
Structure reader * next
};
Void mainmenu() // displays the main menu.
{ system(" cls ")；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
Printf ("\ t \ t \ t 1。 Library information \ n \ n ");
Printf ("\ t \ t \ t 2。 Lending system \ n \ n ");
Printf ("\ t \ t \ t 3。 Log out of the system \ n \ n ");
Printf ("\ t \ t \ tplease press the key to select and press enter to confirm \ n");
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
Return;
}
Voidmenu1()/displays the library information menu.
{ system(" cls ")；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
Printf ("\ t \ t \ t 1。 Edit warehousing \ n \ n ");
Printf ("\ t \ t \ t 2。 Clear inventory \ n \ n ");
Printf ("\ t \ t \ t 3。 Book query \ n \ n ");
Printf ("\ t \ t \ t 4。 Inventory list \ n \ n ");
Printf ("\ t \ t \ t 5。 Go back to the previous level \ n \ n ");
Printf ("\ t \ t \ tplease press the key to select and press enter to confirm \ n");
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
Return;
}
Void menu2() // displays the query menu.
{ system(" cls ")；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
Printf ("\ t \ t \ t 1。 ISBN query \ n \ n ");
Printf ("\ t \ t \ t 2。 Title query \ n \ n ");
Printf ("\ t \ t \ t 3。 Author query \ n \ n ");
Printf ("\ t \ t \ t 4。 By query \ n \ n ");
Printf ("\ t \ t \ tplease press the key to select and press enter to confirm \ n");
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
Return;
}
Void main()// main function, calling main 1
{ void main 1()；
main 1()； }
Voidmain1()/main1function
{ void TSG xx()； //statement
Void borrows a number to pass interest (); //statement
Char selection;
main menu()；
Scanf("%c ",& select);
Toggle (Select)//Function Selection
{ case ' 1 ':tsgxx()； Break;
Case '2': Jieshuxitong (); Break;
Case "3": System ("CLS"); Printf ("\ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t Bye-bye ..."); Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t \ tWelcome to use this software! ! !" ); getch()； Exit (0); System ("CLS"); Break;
}
}
Void tsgxx()// library information function
{ void ts jinku()；
void shanchu()；
void chax unts()；
void xianshikucun()； //Function declaration
Char selection;
menu 1()； //Call menu function
Scanf("%c ",& select);
Scanf("%c ",& select);
for(； ; )
Toggle (Select)//Function Selection
{ case ' 1 ':tsjinku()； Break;
Case' 2': Shanchu (); Break;
Case "3": chaxunts (); Break;
case ' 4 ':xianshikucun()； Break;
Case "5": main1(); Break;
}
}
Int tjzs()// Statistical Text Quantity Function
{ FILE * fp
int tshuhao=0，txcl=0，n；
char tname[20]={'\0'}，tauthor[20]={'\0'}，tchuban[20]= { ' \ 0 ' }；
fp=fopen("library.txt "，" r ")； //Open the file
for(n = 0； ! feof(FP)； N++)// Read files one by one.
Fscanf(fp, "%d% s% s% d",&Chu Hao, Turner, Tao Se, Chu Ban. txcl)；
n-；
fclose(FP)； //Close the file
Return (n); //Returns a number
}
Int tjdzs()// Statistical Text Quantity Function
{ FILE * fp
Int Zheng Hao =0, n;
Char Ziming [20]={'\0'}, Riqi [20]={'\0'}, Zname [20] = {'\ 0'};
fp=fopen("reader.txt "，" r ")； //Open the file
for(n = 0； ! feof(FP)； N++)// Read files one by one.
Fscanf(fp, "%d% s% s", & Zheng Hao & Ziming & Japanese enterprise & Ampzname);
fclose(FP)； //Close the file
Return (n); //Returns a number
}
Void tsjinku()// library entry function
{ FILE * fp
int shuhao=0，xcl=0，n = 0；
char name[20]={'\0'}，author[20]={'\0'}，chuban[20]= { ' \ 0 ' }；
char hitkey
System ("CLS");
If ((FP = fopen ("library. Txt ","r ")= = null)// Open the library file and create it if it doesn't exist.
{ fp=fopen("library.txt "，" w ")；
fclose(FP)；
}
fp=fopen("library.txt "，" a ")；
Printf ("\ n \ n \ n \ t \ t \ t \ t \ tPlease enter the book information in the following format: \ t \ t \ tBook number, title, number of books entered by publisher \ nPlease enter:"); //Enter the library information in format.
for(； Hit the key! =27; )//Cyclic input
{ if (n！ =0)
Printf ("Please enter:");
Scanf("%d%s%s%s%d ",& book number, name, author, publisher, author. xcl)；
Fprintf(fp, "%d% s% s% d \ n", bookseller, name, author, Chu Ban, XCL);
Printf ("Press enter to continue input, press esc\n to end input \ n");
n++；
hitkey = getch()；
for(； Hit the key! = 13。 & keystroke! =27; )
hitkey = getch()；
}
fclose(FP)；
Printf(" \ n \ n \ n \ n \ n \ n \ t \ t tSaved successfully, press any key to return to the previous level! " );
getch()；
tsgxx()； //Return to the previous level
}
Void shanchu()// Delete book information function
{ struct library * head = NULL
Structure library *p, *p 1, * p2
int tshuhao=0，txcl=0，n=0，j，I；
char tname[20]={'\0'}，tauthor[20]={'\0'}，tchuban[20]={'\0'}，TT name[20]= { ' \ 0 ' }；
char hitkey
FILE * fp
If ((FP = fopen ("library.txt ","r ")= = null)// Open the file.
{ system(" cls ")；
Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t The log file does not exist! Press any key to return ... ");
getch()；
tsgxx()；
}
other
{ system(" cls ")；
Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t tPlease enter the title of the book you want to delete: "); //Enter the name of the deleted book.
scanf("%s "，& ampTT name)；
Printf ("\ t \ tpress enter to confirm deletion, or press ESC \ nCancel \ n");
hitkey = getch()；
for(； Hit the key! = 13。 & keystroke! =27; )
hitkey = getch()；
if (hitkey==27)
tsgxx()；
fp=fopen("library.txt "，" r ")；
for(j = 0； ! feof(FP)； )//Read the folder information and count the number.
{ j++；
Fscanf(fp, "%d% s% s% d",&Chu Hao, Turner, Tao Se, Chu Ban. txcl)；
}
fclose(FP)；
fp=fopen("library.txt "，" r ")；
for(I = 1； I & ltj；; i++)
{fscanf(fp, "%d% s% s% d",&Chu Hao, Turner, Tao Se, Chu Ban. txcl)；
If (strcmp(ttname, tname))// Compare names and copy information with different names into the linked list.
{ n++；
If (n== 1)// Create a linked list.
{p 1=p2= (structure library *) malloc (len);
head = p 1；
}
other
{ p2->； next = p 1；
p2 = p 1；
P 1= (structure library *) malloc (len); //Create a new linked list
}
p 1->； Shuhao = tshuhao// Copy ISBN
strcpy(p 1->； Name, tname); //Copy the title of the book
strcpy(p 1->； Author, Tauser); //Copy the author's name
strcpy(p 1->； chuban，tchu ban)； //Copy Publishing House
p 1->； Xcl = txcl// number of copies
}
}
If (n==0)
{ head = NULL
}
other
{
p2->； next = p 1；
p 1->； next = NULL
fclose(FP)；
}
}
fp=fopen("library.txt "，" w ")； //Clear files
fclose(FP)；
fp=fopen("library.txt "，" a ")； //Append file
P = head;
for(； p！ = NULL)// Overwrite the contents of the linked list into the file.
{
fprintf(fp，" %d %s %s %s %d \n "，p-& gt； Shu Hao, P-> Name, p-> Author, P-> chuban，p-& gt； xcl)；
p = p-& gt； Next;
}
fclose(FP)； //Close the file
System ("CLS");
Printf(" \ n \ n \ n \ n \ n \ n \ n \ t \ t tSuccessfully deleted \ n \ tPress any key to return to the previous level \ n ");
getch()； //Return to the previous level
tsgxx()；
}
Void chaxunts()// query function
{
FILE * fp
Char selection;
int ttshuhao=0，tshuhao=0，txcl=0，n=0，k=0，I，l；
char tname[20]={'\0'}，ttauthor[20]={'\0'}，tauthor[20]={'\0'}，ttchuban[20]={'\0'}，tchuban[20]={'\0'}，TT name[20]= { ' \ 0 ' }；
If ((FP = fopen ("library.txt ","r ")= = null)// Open the file.
{ system(" cls ")；
Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t The log file does not exist! Press any key to return ... ");
getch()；
tsgxx()；
}
l = tjzs()； //Get the number of files
menu 2()； //Call menu function
Scanf("%c ",& select); Scanf("%c ",& select); //Select the query method
if (choose=='5 ')
Return;
Elseif (choose ='1')//ISBN query
{ system(" cls ")；
Printf ("Please enter ISBN:");
scanf("%d "，& ampttshuhao)；
}
other
If (choose=='2')// Title query
{ system(" cls ")；
Printf ("Please enter a title:");
scanf("%s "，TT name)；
}
other
If (choose=='3')// author query
{ system(" cls ")；
Printf ("Please enter the author:");
scanf("%s "，TT author)；
}
other
If (choose=='4')// By query
{ system(" cls ")；
Printf ("Please enter publisher:");
scanf("%s "，ttchuban)；
}
System ("CLS");
for(I = 0； I & ltl；; i++)
{fscanf(fp, "%d% s% s% d",&Chu Hao, Turner, Tao Se, Chu Ban. txcl)； //Read file information
if (ttshuhao==tshuhao||！ strcmp(ttname，tname)||！ strcmp(ttauthor，tauthor)||！ Strcmp(ttchuban, tchuban))///Output query information.
{
If (k==0)
{
Printf ("\ t \ t \ t \ tQuery result: \ n \ n");
Printf(" \ t ISBN, title, author publishing house \ n ");
}
printf(" \ t %-4d %-8s %-8s %-4d \ n "，tshuhao，tname，tauthor，tchuban，txcl)；
k++；
}
}
If (k==0)// If the folder is empty, no records will be output.
{ system(" cls ")；
Printf ("\ n \ n \ n \ n \ n \ n \ n \ t \ tNo matching record! \ n ")；
getch()；
tsgxx()；
}
fclose(FP)；
getch()； //Return
tsgxx()；
}
Void xianshikucun()// Actual inventory information
{
FILE * fp
int shuhao=0，xcl=0，n=0，i=0，j = 0；
char name[20]={'\0'}，author[20]={'\0'}，chuban[20]= { ' \ 0 ' }；
If ((fp = fopen ("library.txt ","r ")= = null)// Open the folder.
{
System ("CLS");
Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t The log file does not exist! " );
}
n = tjzs()；
If (n==0)
{ system(" cls ")；
Printf ("\ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ tNo record!" );
}
fp=fopen("library.txt "，" r ")；
System ("CLS");
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
Printf(" \ t ISBN title author publishing house directory \ n ");
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
for(I = 0； I & ltn；; I++)// Output information
{
Fscanf(fp, "%d% s% s% d", & book number, name, author, publisher, author. xcl)；
Printf(" \ t %-4d %-8s %-8s %-4d \ n ",book name, author, Chu Ban, XCL);
}
fclose(FP)；
Printf ("\ t \ t \ t \ tPress any key to return \ n");
getch()； //Return
tsgxx()；
}
Void menu3() // Displays the main menu of the borrowing system.
{ system(" cls ")；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
Printf ("\ t \ t \ t 1。 Book lending registration \ n \ n ");
Printf ("\ t \ t \ t 2。 Book return registration \ n \ n ");
Printf ("\ t \ t \ t 3。 Check the borrowing situation \ n \ n ");
Printf ("\ t \ t \ t 4。 Go back to the previous level \ n \ n ");
Printf ("\ t \ t \ tplease press the key to select and press enter to confirm \ n");
printf("*^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ ^_^*”)；
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
Return;
}
Void jieshuxitong()// Borrow system function
{void Shu Jie ();
void huanshu()；
void duzheilang()； //Function declaration
Char selection;
menu 3()；
Scanf("%c ",& select);
Scanf("%c ",& select); //Select function
for(； ; )
Switch (Select)//Call Function
{case' 1': Shu Jie (); Break;
Case' 2': Huan Shu (); Break;
case ' 3 ':duzheilang()； Break;
Case "4": main1(); Break;
}
}
Void Shu Jie ()//Borrow function
{
FILE *fp，* fp3
struct library * head = NULL
Structure library *p, *p 1, * p2
Int tshuhao=0, txcl=0, I, loop, Zheng Hao =0, n=0, k=0, t=0, flag = 0；;
Char tname[20]={'\0'}, tauthor[20]={'\0'}, tchuban[20]={'\0'}, ttname[20]={'\0'}, Zi Ming [20] = {'
char hit key = 0；
System ("CLS");
{
If ((FP = fopen ("library.txt ","r ")= = null)// Open the library file.
{
System ("CLS");
Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t The library is out of stock! Press any key to exit! ”);
getch()；
Exit (0);
}
other
{
{
Printf(" \ n \ n \ n \ t \ t \ t \ t \ t tPlease enter the book name: \ t \ t \ tPlease enter: "); //Enter the title of the book
scanf("%s "，zname)；
k = tjzs()； //Count the number of library documents.
for(I = 0； I & ltk；; I++)// Read the library information and store it in the linked list.
{
Fscanf(fp, "%d% s% s% d",&Chu Hao, Turner, Tao Se, Chu Ban. txcl)；
n++；
If (n== 1)
{p 1=p2= (structure library *) malloc (len);
head = p 1；
}
other
{ p2->； next = p 1；
p2 = p 1；
P 1= (structure library *) malloc (len); //Create a new linked list
}
p 1->； Shuhao = tshuhao// Copy ISBN
strcpy(p 1->； Name, tname); //Copy the title of the book
strcpy(p 1->； Author, Tauser); //Copy the author
strcpy(p 1->； chuban，tchu ban)； //Copy Publishing House
p 1->； Xcl = txcl// Copy on-hand quantity
}
If (n==0)
head = NULL
other
{
p2->； next = p 1；
p 1->； next = NULL
fclose(FP)；
}
}
}
P = head;
for(； p！ = NULL)// Read the linked list
{
If (! (strcmp(p-& gt； Name, zname)))//)///)/with the same name
{ flag = 1； //The tag is 1.
loop = p-& gt； Xcl// quantity on hand minus 1
(p->； xcl)-； }
p = p-& gt； Next;
}
If (logo &&(loop & gt0)//has a book borrowing title and the quantity on hand is greater than 0.
{ fp=fopen("library.txt "，" w ")；
fclose(FP)；
fp=fopen("library.txt "，" a ")；
P = head;
for(； p！ = NULL)
{
fprintf(fp，" %d %s %s %s %d \n "，p-& gt； Shu Hao, P-> Name, p-> Author, P-> chuban，p-& gt； xcl)；
p = p-& gt； Next;
}
Free (p); //Overwrite the file with the contents of the linked list.
fclose(FP)； }
If (logo &&(loop & gt0)//has a book borrowing title and the quantity on hand is greater than 0.
{
{
If ((fp3 = fopen ("reader.txt ","r ")= = null)// Create a reader folder.
{ fp3=fopen("reader.txt "，" w ")；
fclose(fp3)；
}
fp3=fopen("reader.txt "，" a ")；
}
{
{ if (n！ =0)
Printf ("\ n \ n \ n \ n \ n \ n \ t \ tPlease enter the card reader information in the following format: \ t \ t \ t \ certificate number return date name \ nPlease enter:"); //Enter reader information
Scanf("%d %s %s %s ",& Zheng Hao & Ziming [20], & Riqi [20], & Ampzname [20]);
Fprintf(fp3, "%d% s% s \ n", Zheng Hao&Zi Ming [20], & Riqi [20], & Ampzname [20]);
fp=fopen("library.txt "，" w ")； //Delete library file information
fclose(FP)；
fp=fopen("library.txt "，" a ")； //Add information again
P = head;
for(； p！ = NULL)// Overwrite the contents of the linked list with the library file.
{
fprintf(fp，" %d %s %s %s %d \n "，p-& gt； Shu Hao, P-> Name, p-> Author, P-> chuban，p-& gt； xcl)；
p = p-& gt； Next;
}
fclose(FP)；
fclose(fp3)；
Printf ("Success! Press any key to return \ n ");
getch()； //Return
Relieve summer heat and relieve pain ();
}
}
Relieve summer heat and relieve pain ();
}
other
Printf ("This book has been borrowed! Press any key to return! ”); //Otherwise, the output book has been connected.
getch()； //Return
Relieve summer heat and relieve pain ();
}
}
Void huanshu()// returns the function.
{FILE *fp，* fp3
struct reader * head = NULL
Structure reader *p, *p 1, * p2
Structure library * lhead1= null;
Structure library *zp 1, *lp 1, * lp2
int tshuhao=0，txcl=0，I；
char tname[20]={'\0'}，tauthor[20]={'\0'}，tchuban[20]={'\0'}，TT name[20]= { ' \ 0 ' }；
int ttzhenghao=0，tzhenghao = 0，n=0，k=0，t=0，flag = 0；
char tmingzi[20]={'\0'}，triqi[20]={'\0'}，tzname[20]={'\0'}，ttz name[20]= { ' \ 0 ' }；
char hit key = 0；
System ("CLS");
{
If ((FP = fopen ("reader。 Txt ","r ")= = null)// If there is no reader file, the output cannot be returned.
{
System ("CLS");
Printf ("\ n \ n \ n \ n \ n \ n \ n \ n \ nNo borrower! Press any key to exit! ”);
getch()；
Exit (0);
}
other
{
{
Printf(" \ n \ n \ n \ n \ n \ n \ t \ t tPlease enter the reader ID number and book title: \ t \ t \ t \ Please enter: ");
scanf("%d %s "，& ampttzhenghao，ttz name)； //Enter the card number and title of the book to be returned.
k = tjdzs()； //Get the number of reader folder information.
for(I = 0； I & ltk；; I++)// Read the reader folder information.
{
fscanf(fp，" %d%s%s%s\n "，& amptzhenghao，tmingzi，triqi，tz name)；
if((TT Zheng Hao = = tzeng Hao)& amp； & amp！ Strcmp(ttzname, tzname))// If the title of the certificate number exists, it is marked as 1.
flag = 1；
}
fclose(FP)；
fp=fopen("reader.txt "，" r ")； //Open the reader file
If (logo)
{
for(I = 0； I & ltk；; I++)// Copy the reader file to the linked list.
{
fscanf(fp，" %d%s%s%s\n "，& amptzhenghao，tmingzi，triqi，tz name)； //Read file information
If (! ((TT Zheng Hao = = tzeng Hao)& amp； & amp！ strcmp(ttzname，tzname)))
{ n++；
If (n== 1)
{ p 1 = p2 =(struct reader *)malloc(l EN 1)； //Create a new linked list
head = p 1；
}
other
{ p2->； next = p 1；
p2 = p 1；
P 1= (structure reader *) malloc (en1); //Create a new linked list
}
p 1->； Zheng Hao = Hao Zheng; //Copy the certificate number
strcpy(p 1->； Zi Ming, tmingzi); //Copy the reader's name
strcpy(p 1->； Richie, Tredge); //Copy date
strcpy(p 1->； zname，tz name)； //Copy the title of the book
}
}
If (n==0)
head = NULL
other
{
p2->； next = p 1；
p 1->； next = NULL
fclose(FP)；
}
fp=fopen("reader.txt "，" w ")； //Clear the reader file
fclose(FP)；
fp=fopen("reader.txt "，" a ")； //Additional information
P = head;
for(； p！ = NULL)// Overwrite the contents of the linked list to the reader file.
{
fprintf(fp，" %d %s %s %s \n "，p-& gt； Zheng Hao, P-> Zi Ming, P-> Riqi, P-> zname)；
p = p-& gt； Next;
}
Free (p);
fclose(FP)；
}
}
}
}
If(flag)// marked as 1, when returning the book.
{
{
{printf ("Please press Enter to confirm the return of the book!" );
for(； Hit the key! = 13。 & keystroke! =27; )
hitkey = getch()；
if (hitkey== 13)
Printf ("Success! Press any key to return! ”);
n = 0； flag = 0；
fp3=fopen("library.txt "，" r ")； //Open the library file
k = tjzs()； //Get the number of library files
for(I = 0； I & ltk；; I++)// Copy the library file to the linked list.
{
Fscanf(fp3, "%d% s% s% d",&Chu Hao, Turner, Tao Se, Chu Ban. txcl)； //Read information
n++；
If (n== 1)
{lp 1=lp2= (structural library *) malloc (len); //Create a new linked list
lhead 1 = LP 1；
}
other
{ lp2->； next = LP 1；
lp2 = LP 1；
Lp 1= (structure library *) malloc (len); //Create a new linked list
}
LP 1->； Shuhao = tshuhao// Copy ISBN
strcpy(LP 1->； Name, tname); //Copy the title of the book
strcpy(LP 1->； Author, Tauser); //Copy the author
strcpy(LP 1->； chuban，tchu ban)； //Copy Publishing House
LP 1->； Xcl = txcl// Copy on-hand quantity
}
If (n==0)
{ lhead 1 = NULL；
}
other
{
lp2->； next = LP 1；
LP 1->； next = NULL
fclose(fp3)；
}
}
}
ZP 1 = lhead 1；
for(； zp 1！ = NULL)
{
If (! (strcmp(ZP 1->； Name, ttzname))//)/Find the same title.
++(ZP 1->； xcl)； //existing quantity plus 1
ZP 1 = ZP 1-& gt； Next;
}
fp3=fopen("library.txt "，" w ")； //Empty the library file
fclose(FP)；
fp3=fopen("library.txt "，" a ")； //Additional information
ZP 1 = lhead 1；
for(； zp 1！ = NULL)// Overwrite the contents of the linked list with the library file.
{
fprintf(fp3，" %d %s %s %s %d \n "，ZP 1-& gt； Shu Hao, ZP1-> Name, ZP1->; Author, ZP1->; chuban，ZP 1->； xcl)； //Enter information
ZP 1 = ZP 1-& gt； Next;
}
fclose(fp3)；
getch()； //Return
Relieve summer heat and relieve pain ();
}
other
Printf ("This information does not exist! Press any key to return! ”);
getch()； //Return
Relieve summer heat and relieve pain ();
}
Void duzheilang()// Displays the borrowing function.
{
FILE * fp
Int Zheng Hao =0, xcl=0, n=0, i=0, j = 0；;
Char Ziming [20]={'\0'}, Riqi [20]={'\0'}, Zname [20] = {'\ 0'};
If ((FP = fopen ("reader.txt ","r ")= = null)// Open the reader folder.
{
System ("CLS");
Printf(" \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ t The log file does not exist! " );
}
n = tjdzs()；
If (n==0)
{ system(" cls ")；
Printf ("\ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ t \ tNo record!" );
}
fp=fopen("reader.txt "，" r ")；
System ("CLS");
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
printf(" \ tReader ' s name with certificate number，book return date，book title \n ")。
printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *)；
for(I = 0； I & ltn；; I++)// Output file information
{
Fscanf(fp, "%d% s% s \ n", & Zheng Hao, Ziming, Riqi, Zname);
Printf(" \ t %-4d %-8s %-8s \ n ",Zheng Hao, Ziming, Riqi, Zname);
}
fclose(FP)；
Printf ("\ t \ t \ t \ tPress any key to return \ n");
getch()； //Return
Relieve summer heat and relieve pain ();
}