Lab_Evaluation-1_Hotel_Management

#include<bits/stdc++.h>
#include<windows.h>
#include<unistd.h>

using namespace std;

typedef struct guests{
    int id, room;
    string name;
    struct guests *next;
}guests;
guests *start = NULL;

#define int long long

void landing();
void addGuest();
void removeGuest();
void Display();

signed main(){
    bool stop = false;
    while(!stop){
        landing();
        int op;
        cin>>op;
        switch(op){
            case 1:
                addGuest();
                break;
            case 2: 
                removeGuest();
                break;
            case 3:
                Display();
                break;
            case 4:
                stop = true;
                break;
        }

    }
}

void landing(){
    cout<<endl<<"Hotel Reservation System: "<<endl;
    cout<<"\t1. Add a guest"<<endl;
    cout<<"\t2. Remove a guest"<<endl;
    cout<<"\t3. Display guests"<<endl;
    cout<<"\t4. Exit"<<endl<<endl;
    cout<<"Enter your choice: ";
}

void addGuest(){
    int id, room;
    string name;
    cout<<"Enter Guest ID: ";
    cin>>id;
    cout<<"Enter Guests Name: ";
    cin.ignore();
    getline(cin,name);
    //cin>>name;
    cout<<"Enter Reserved Room No: ";
    cin>>room;

    guests *newGuest = new guests();
    newGuest->id = id;
    newGuest->room = room;
    newGuest->name = name;
    newGuest->next = NULL;
    if(start==NULL){
        start = newGuest;
    }
    else{
        guests *p = start;
        while(p->next!=NULL){
            p = p->next;
        }
        p->next = newGuest;
    }
    cout<<endl<<newGuest->name<<" is checked in."<<endl;
    Sleep(1000);
}

void removeGuest(){
    int id;
    cout<<"Guest ID: ";
    cin>>id;
    guests *p = start, *prev = NULL;
    while(p!=NULL){
        if(p->id == id){
            break;
        }
        prev = p;
        p = p->next;
    }
    if(prev==NULL){
        start = start->next;
    }
    else{
        prev->next = p->next;
    }
    cout<<endl<<p->name<<" is checked out"<<endl;
    delete p;
    Sleep(1000);
}

void Display(){
    guests *p = start;
    int ct = 0;
    cout<<"All guests: "<<endl;
    while(p!=NULL){
        cout<<p->id<<" "<<p->name<<" "<<p->room<<endl;
        ct++;
        p = p->next;
    }
    cout<<"Total guests: "<<ct<<endl;
    
}