Question

I need this code in C programming. Can anyone pls help me in this?

Project 8, Program Design A hotel owner would like to maintain a list of laundry service requests by the guests. Each request was stored with the room number, the guest's first name, last name, and number of items. The program laundry_list.ccontains the struct request declaration, function prototypes, and the main function. Complete the function definitions so it uses a dynamically allocated linked list to store the laundry requests. Complete the following functions: 1. append to_list: Ask the user to enter the room number, the guest's first name, last name, and number of items (in the exact order). Check whether a request has already existed by room number. If a request has the same room number with an existing book in the list, the function should print a message about using the update function to update the number of items and exit. If the request by room number does not exist, ask the user to enter the guest's first and last name, the number of items, allocate memory for it, store the data, and append it to the end of the linked list. If the list is empty, the function should return the pointer to the newly created linked list. Otherwise, add the request to the end of the linked list and return the pointer to the linked list. a. b. c. d. update: update a laundry service request's number of items. Ask the user to enter the room number. Find the matching room number, ask the user to enter the number of items to be added and update the number of items. If the room number is not found, print a message printList:print the room number, guest's first and last name, and number of items of all requests in the list clearList: when the user exists the program, all the memory allocated for the linked list should be deallocated. 2. 3. 4. Note: use read_line function included in the program for reading first name, and last name.

Answer 1

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int main(void) 29 30 31 32 Enter operation code: a Enter room number: 1 A request for this room already exists. Please use update function to update the request. char code; struct request *new_listNULL; printf("Operation Code: a for appending to the list, u for updating a request Enter operation code: a Enter room number: 2 Enter first name: Anjali Enter last name: Gupta Enter number of items: 3 34 35 36 37 38 39 ", p for printing the list; q for quit. \n"); for printf("Enter operation code: ") scanf(" %c", &code); while (getchar) !-nskips to end of Enter operation code: u Enter room number: 2 Enter number of items to be added: 4 updaeted

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define NAME_LEN 30

struct request{
   int room_number;
   char first[NAME_LEN+1];
   char last[NAME_LEN+1];
   int num_items;
   struct request *next;
};


struct request *append_to_list(struct request *list);
void update(struct request *list);
void printList(struct request *list);
void clearList(struct request *list);
int read_line(char str[], int n);

/**********************************************************
* main: Prompts the user to enter an operation code, *
* then calls a function to perform the requested *
* action. Repeats until the user enters the *
* command 'q'. Prints an error message if the user *
* enters an illegal code. *
**********************************************************/
int main(void)
{
        char code;

        struct request *new_list = NULL;
        printf("Operation Code: a for appending to the list, u for updating a request"
           ", p for printing the list; q for quit.\n");
        for (;;) {
                printf("Enter operation code: ");
                scanf(" %c", &code);
                while (getchar() != '\n') /* skips to end of line */
                ;
                switch (code) {
                        case 'a': new_list = append_to_list(new_list);
                        break;
                        case 'u': update(new_list);
                        break;
                        case 'p': printList(new_list);
                        break;
                        case 'q': clearList(new_list);
                                   return 0;
                        default: printf("Illegal code\n");
                }
                printf("\n");
        }
}

struct request *append_to_list(struct request *list){
        int room_number;

        printf("Enter room number: ");
        scanf("%d", &room_number);
        while (getchar() != '\n');
   
        struct request *ptr = list;
        if(list != NULL) {
           do {
                   if(ptr->room_number == room_number) {
                           printf("A request for this room already exists.\n");
                           printf("Please use update function to update the request.\n");
                           return list;
                   }
                   if(ptr->next != NULL) {
                                ptr = ptr->next;
                   }
           } while(ptr->next != NULL);
        }       
        
        struct request *newReq = malloc(sizeof(struct request));
        newReq->room_number = room_number;
        printf("Enter first name: ");
        read_line(newReq->first, NAME_LEN);
        printf("Enter last name: ");
        read_line(newReq->last, NAME_LEN);
        printf("Enter number of items: ");
        scanf("%d", &newReq->num_items);
        while (getchar() != '\n');
        
        
        if(list == NULL) {
                list = newReq;
        } else {                
                ptr->next = newReq;
        }
        
        return list;
}

void update(struct request *list)
{
        int room_number;
        printf("Enter room number: ");
        scanf("%d", &room_number);
   
        struct request *ptr = list;
        while(ptr != NULL) {
                if(ptr->room_number == room_number) {
                        int n;
                        
                        printf("Enter number of items to be added: ");
                        scanf("%d", &n);
                        while (getchar() != '\n');
                        ptr->num_items += n;
                        printf("updaeted\n");
                        return;
                }
                ptr = ptr->next;
        };
        
        printf("No room exists with this room number\n");
}


void printList(struct request *list){   
        struct request *ptr = list;
        while(ptr != NULL) {
                
                printf("Room: %d\n", ptr->room_number);
                printf("%s %s\n", ptr->first, ptr->last);
                printf("numItems: %d\n", ptr->num_items);
                printf("\n");
                
                ptr = ptr->next;
        };
}

void clearList(struct request *list)
{
        if(list == NULL) {
                return;
        }
        
        clearList(list->next);
        free(list);
}

int read_line(char str[], int n)
{
        int ch, i = 0;

        while (isspace(ch = getchar()))
        ;
        str[i++] = ch;
        while ((ch = getchar()) != '\n') {
        if (i < n)
        str[i++] = ch;
          
        }
        str[i] = '\0';
        return i;
}