Answer to Question #201172 in C++ for wakio

Question

Library Managment system project c++ using 4 classes

Answer 1

#include <iostream>
#include <string>
#include <vector>
using namespace std;



class Item{
protected:
    int borrowed;
    string name; 
	string borrowedBy;
	string year;
	int quantity; 


public:
	Item() {
		this->borrowed = 0;
	}
	Item(int borrowed,string name,string borrowedBy,string year,int quantity) {
		this->borrowed = borrowed;
		this->name = name;
		this->borrowedBy = borrowedBy;
		this->year = year;
		this->quantity = quantity;
	}


	virtual void displayDetails()const=0{
		cout<<"Name: "<<name<<endl;
		if(this->borrowed==0){
			cout<<"Borrowed by: NONE"<<endl;
		}else{
			cout<<"Borrowed by: "<<borrowedBy<<endl;
		}
		cout<<"Year: "<<year<<endl;
		cout<<"Quantity: "<<quantity<<endl;
	}


	void borrowItem(string borrowedBy){
		this->borrowed =1;
		this->borrowedBy =borrowedBy;
		this->quantity--;
	}


	void returnItem(){
		this->borrowed=0;
		this->borrowedBy="NONE";
		this->quantity++;
	}
	int getQuantity(){
		return quantity;
	}


	string getBorrowerName(){
		return borrowedBy;
	}
};    


class MusicAlbum:public Item{
private:
    string artist; 
	string recordLabel;
public:
	MusicAlbum():Item(){}
	MusicAlbum(int borrowed,string name,string borrowedBy,string year,int quantity,string artist,string recordLabel):
			Item(borrowed,name,borrowedBy,year,quantity){
		this->artist = artist;
		this->recordLabel = recordLabel;
	}
	void MusicAlbum::displayDetails()const {
		cout << "Music album"<<endl;
		Item::displayDetails();
		cout<<"Artist: "<<artist<<endl;
		cout<<"Record label: "<<recordLabel<<endl;
	}
};    
class Book:public Item{
private:
    string author; 
	string publisher;
	string edition;
public:
	Book():Item(){}


	Book(int borrowed,string name,string borrowedBy,string year,int quantity,string author,string publisher,string edition):
			Item(borrowed,name,borrowedBy,year,quantity){
		this->author = author;
		this->publisher = publisher;
		this->edition = edition;
	}
	//display information about Book
	void displayDetails() const{
		cout << "Book"<<endl;
		Item::displayDetails();
		cout<<"Author: "<<author<<endl;
		cout<<"Publisher: "<<publisher<<endl;
		cout<<"Edition: "<<edition<<endl;
	}
};
class Film:public Item{
private:
    string director; 
	string language;
public:


	Film():Item(){}
	Film(int borrowed,string name,string borrowedBy,string year,int quantity,string director,string language):
			Item(borrowed,name,borrowedBy,year,quantity){
		this->director = director;
		this->language = language;
	}


	void displayDetails()const{
		cout << "Film"<<endl;
		Item::displayDetails();
		cout<<"Director: "<<director<<endl;
		cout<<"Language: "<<language<<endl;
	}
};




int mainMenu();
void addItem(vector<Item*>* items);
void deleteSelectedItem(vector<Item*>* items);
void displayAllItems(vector<Item*> items);
void borrowItem(vector<Item*>* items);
void returnItem(vector<Item*>* items);
int searchItemByBorrower(vector<Item*> items,string borrowerName);




int main(){
    vector<Item*> items;
	int ch=-1;
	while(ch!=6){
		ch=mainMenu();
		switch(ch){
			case 1:
				addItem(&items);
				break;
			case 2:
				deleteSelectedItem(&items);
				break;
			case 3:
				displayAllItems(items);
				break;
			case 4:
				borrowItem(&items);
				break;
			case 5:
				returnItem(&items);
				break;
			case 6:
				//exit
				break;
			default:
				cout<<endl<<"Select correct menu item.\n\n";
				break;
		}
	}


    return 0;
}
//This function displays main menu and allows the user to select menu item.
int mainMenu(){
	int choice=-1;
	cout<<"1. Add new item"<<endl;
	cout<<"2. Delete selected item"<<endl;
	cout<<"3. Display all items"<<endl;
	cout<<"4. Borrow the item"<<endl;
	cout<<"5. Return the item"<<endl;
	cout<<"6. Exit"<<endl;
	cout<<"Your choice: ";
	cin>>choice;
	return choice;
}
//This method allows to add new item to database
void addItem(vector<Item*>* items){
	int ch=-1;
	while(ch!=4){
		ch=-1;
	
		cout<<"1. Add new music album"<<endl;
		cout<<"2. Add new book"<<endl;
		cout<<"3. Add new film"<<endl;
		cout<<"4. Exit to main menu"<<endl;
	
		while(ch<1 || ch>4){
			cout<<"Your choice: ";
			cin>>ch;
		}


		int borrowed;
		string name; 
		string year;
		int quantity; 
		//MusicAlbum
		string artist; 
		string recordLabel;
		//book
		string author; 
		string publisher;
		string edition;
		//film
		string director; 
		string language;
		getline(cin,name);
		if(ch==1){
			cout<<"Enter name of music album: ";
			getline(cin,name);
			cout<<"Enter year of music album: ";
			getline(cin,year);
			cout<<"Enter number of copies: ";
			cin>>quantity;
			cout<<"Enter artist of music album: ";
			getline(cin,artist);
			getline(cin,artist);
			cout<<"Enter record label of music album: ";
			getline(cin,recordLabel);
			MusicAlbum* musicAlbum=new MusicAlbum(0,name,"",year,quantity,artist,recordLabel);
			items->push_back(musicAlbum);
		}
		if(ch==2){
			cout<<"Enter name of book: ";
			getline(cin,name);
			cout<<"Enter year of book: ";
			getline(cin,year);
			cout<<"Enter number of copies: ";
			cin>>quantity;
			cout<<"Enter author of book: ";
			getline(cin,author);
			getline(cin,author);
			cout<<"Enter publisher of book: ";
			getline(cin,publisher);
			cout<<"Enter edition of book: ";
			getline(cin,edition);
			Book* book=new Book(0,name,"",year,quantity,author,publisher,edition);
			items->push_back(book);	
		}
		if(ch==3){
			cout<<"Enter name of film: ";
			getline(cin,name);
			cout<<"Enter year of film: ";
			getline(cin,year);
			cout<<"Enter number of copies: ";
			cin>>quantity;
			cout<<"Enter director of film: ";
			getline(cin,director);
			getline(cin,director);
			cout<<"Enter language of film: ";
			getline(cin,language);
			Film* film=new Film(0,name,"",year,quantity,director,language);
			items->push_back(film);		
		}
	}
}
//This method deletes selected item from database
void deleteSelectedItem(vector<Item*>* items){
	if(items->size()>0){
		int index=0;
		displayAllItems(*items);
		while(index<1 || index>items->size()){
			cout<<"Select item to delete: ";
			cin>>index;
		}
		index--;
		items->erase(items->begin() + index);
		cout<<endl<<"Selected item has been deleted!"<<endl<<endl;
	}else{
		cout<<endl<<"No items in database!"<<endl<<endl;
	}
}
//This method allows to borrow item
void borrowItem(vector<Item*>* items){
	if(items->size()>0){
		int index=0;
		
		displayAllItems(*items);
		
		while(index<1 || index>items->size()){
			cout<<"Select item to borrow: ";
			cin>>index;
		}
		index--;
	
		if(items->at(index)->getQuantity()>0){
			string borrowerName;
			
			cout<<"Enter name of library member: ";
			getline(cin,borrowerName);
			getline(cin,borrowerName);
			
			items->at(index)->borrowItem(borrowerName);
			cout<<endl<<"Selected item has been borrowed!"<<endl<<endl;	
		}else{
			cout<<endl<<"No items in database! Number of copies = 0!!!"<<endl<<endl;
		}
	}else{
		cout<<endl<<"No items in database!"<<endl<<endl;
	}
}
//This method allows to return item by borrower name
void returnItem(vector<Item*>* items){
	if(items->size()>0){
		string borrowerName;
		cout<<"Enter the name of library member: ";
		getline(cin,borrowerName);
		getline(cin,borrowerName);
		int index=searchItemByBorrower(*items,borrowerName);
		if(index!=-1){
			items->at(index)->returnItem();
			cout<<endl<<"Selected item has been returned!"<<endl<<endl;	
		}else{
			cout<<endl<<"Selected borrower has not items!!!"<<endl<<endl;
		}
	}else{
		cout<<endl<<"No items in database!"<<endl<<endl;
	}
}
//This method allows to search item index by borrower name
int searchItemByBorrower(vector<Item*> items,string borrowerName){
	if(items.size()>0){
		for(int i=0;i<items.size();i++){
			if(items[i]->getBorrowerName().compare(borrowerName)==0){
				return i;//return index of item
			}
		}
	}
	return -1;
}
//This methods displays all items in database
void displayAllItems(vector<Item*> items){
	if(items.size()>0){
		cout<<endl;
		for(int i=0;i<items.size();i++){
			cout<<"Item: "<<(i+1)<<endl;
			items[i]->displayDetails();	
			cout<<"----------------------------------------"<<endl;
		}
	}else{
		cout<<endl<<"No items in database!"<<endl<<endl;
	}
}