Hotel management system (C language)

# include & ltstdlib.h & gt

# include & ltstring.h & gt

Structure Customer _ Node {

char id[ 18]；

Int days;

int money

Char room number [3];

struct customers _ node * next

};

Struct customers_node * p0, * header;

//# Definition N 100

struct customers _ node * Create _ Cust _ Doc()； //New

struct customers _ node * insert doc(struct customers _ node * head，char id[])； //Insert

struct customers _ node * delete doc(struct customers _ node * head，char id[])； //Delete

struct customers _ node * search doc(struct customers _ node * head，char id[])； //query

void Print _ Cust _ Doc(struct customers _ node * head)； //Call the information function

Structural Customer _ Node * Customer (Structural Customer _ Node * P0); //Do you need to allocate dynamic storage space for p0?

int main(void)

{

struct customers _ node * head

Int selection;

char id[ 18]；

Do {

Printf ("This system function: \ n");

Printf(" 1。 Create 2. Search 3. Insert 4. delete 5 . print 0:Exit \ n ")；

Printf ("Please select:");

Scanf("%d ",& select);

Switch (Select) {

Case 1:

head = Create _ Cust _ Doc()；

Break;

Case 2:

Printf ("Please enter your ID number: \ n");

scanf("%s "，id)；

head=searchDoc(head，id)；

Break;

Case 3:

Printf ("Please enter your ID number: \ n");

scanf("%s "，id)；

head=InsertDoc(head，id)；

Break;

Case 4:

Printf ("Please enter your ID number: \ n");

scanf("%s "，id)；

head=DeleteDoc(head，id)；

Break;

Case 5:

Print_Cust_Doc (header);

Break;

Case 0:

Break;

}

}while (choose! =0);

Returns 0;

}

Structural Customer _ Node * Customer (Structural Customer _ Node * p0)

{

Structure customers _ node * p；;

Int days, money, choice, z;

char id[ 18]；

Char room number [3];

Printf ("Please enter your ID number: \ n");

scanf("%s "，id)；

Printf ("You have successfully logged in! \ n ")；

Printf ("Please select room type: \ n");

Printf(" 1。 Single room/night 150 yuan \n 2. Double room/night in 200 yuan \n 3. Standard Room/Night 300 yuan \n 4. Presidential Suite/Night 600 yuan \ n ");

Scanf("%d ",& select);

Switch (Select) {

Case 1:printf ("Please enter the scheduled number of days \ n");

Scanf("%d ",& days);

Money = days *150;

Printf ("please pay %d yuan in advance \n", money);

Printf(" 1。 Ok (reservation successful) 2. Return (whether to reschedule) \ n ");

scanf("%d "，& ampz)；

if(z== 1){

Printf ("You have made a reservation successfully ★ The room number is");

scanf("%s "，room number)；

} broken;

Scenario 2:printf ("Please enter a predetermined number of days \ n");

Scanf("%d ",& days);

Money = days * 200;

Printf ("please pay %d yuan in advance \n", money);

Printf(" 1。 Ok (reservation successful) 2. Return (whether to reschedule) \ n ");

scanf("%d "，& ampz)；

if(z== 1){

Printf ("You have made a reservation successfully ★ The room number is");

scanf("%s "，room number)；

} broken;

Case 3: printf ("Please enter the scheduled number of days:");

Scanf("%d ",& days);

Money = days * 300;

Printf ("please pay %d yuan in advance \n", money);

Printf(" 1。 Ok (reservation successful) 2. Return (whether to reschedule) \ n ");

scanf("%d "，& ampz)；

if(z== 1){

Printf ("You have made a reservation successfully ★ The room number is");

scanf("%s "，room number)；

} broken;

Scenario 4:printf ("Please enter a predetermined number of days \ n");

Scanf("%d ",& days);

Money = days * 600;

Printf ("please pay %d yuan in advance \n", money);

Printf(" 1。 Ok (reservation successful) 2. Return (whether to reschedule) \ n ");

scanf(" %d "，& ampz)；

if(z== 1){

Printf ("You have made a reservation successfully ★ The room number is");

scanf("%s "，room number)；

} broken;

Default: printf ("Your input is wrong, please try again, thank you. \ n ")；

Break;

P= (structured customer _ node *)malloc(sizeof)); //Can the transfer of structural elements be completed with pointers?

strcpy(p-& gt； id，id)；

strcpy(p-& gt； roomnumber，room number)；

p->； Days = days;

p->； Money = money;

Return p;

}

structural customers _ node * create _ cust _ doc()//New

{

Structure customers_node * head, * p；;

int size = size of(struct customers _ node)；

p =(struct customers _ node *)malloc(size)；

head->； next = NULL

Customer (* P0); //Call the function

//p = P0；

head->； next = p；

Return head;

}

struct customers _ node * insert doc(struct customers _ node * head)；

{

Structure customers_node *q, * temp

Q= (structured customer _ node *)malloc(sizeof);

Customer (P0);

Temp = p0// Unresolved element insertion

q = head-& gt； Next;

if(head-& gt； next==NULL){

Q = temperature;

q->； next = NULL

}

while(q->； Next) q = q-& gt；; Next;

q->； next = temp

Return head;

}

Struct customers _ node * searchdoc (struct customers _ node * head, charid)// Can I return all the elements in the structure by using id only?

{

struct customers _ node * p = head-& gt； Next;

p = head-& gt； Next;

if(head-& gt； next==null)

Printf ("unoccupied");

Otherwise {

while(strcmp(id，p-& gt； id)！ =0) // How to only use id to represent the data part in the node (structure) p = p-& gt；; Next;

p = p-& gt； Next;

}

Return p;

}

struct customers _ node * delete doc(struct customers _ node * head，char id)

{

Structure customer _ node * p, * q；;

p = head-& gt； Next;

q = p->； Next;

if(p==null)

Returns null

And (p! =null){

if(strcmp(id，p-& gt； id)==0){

q = p；

Free (p);

}

p = p-& gt； Next;

q = p->； Next;

}

Return head;

}

void Print _ Cust _ Doc(struct customers _ node * head)

{

Structure customers _ node * q；;

if(head-& gt； next==null){

Printf ("\ nNo record \ n");

Return;

}

Printf ("Check-in customer record: \ n");

for(q = head-& gt； Next; q； q = q-& gt； Next) {

Printf ("ID number: %s\t ",q-> id)；

Printf ("registration days: %d\t", q-> Day);

Printf ("advance payment: %d\t", q-> Money);

Printf ("room number: %s\n", q-> room number)；

}

}