Question: IN C++ add Inheritance, Class and Pointers to program This is a library management program, users can borrow books and return books. Just incorporate the
IN C++ add Inheritance, Class and Pointers to program
This is a library management program, users can borrow books and return books.
Just incorporate the use of Inheritance, Class and Pointers into this program. The program should work the same after your edits.
#include
using namespace std;
//structure to store library data
struct library
{
int code;
char title[20];
int status;
};
//structure to store user data
struct users
{
int id;
char name[20];
int booksNumber;
};
int main()
{
int tempId, i, flag = 0, j;
char tempName[20];
int tempCode;
struct users user_details[100]; //variable to hold 100 userdetails
struct library book_details[100]; //variable to hold 100 book details
int user_count = 0, books_count = 0;
int choice;
//this loop runs until 7 is entered
do
{
cout << "MENU ";
cout << "1. Add a new book ";
cout << "2. Add a new user ";
cout << "3. Borrow a book ";
cout << "4. Return a book ";
cout << "5. Search a book ";
cout << "6. Displays users and number of books they have ";
cout << "7. Exit ";
cout << "Enter your choice : ";
cin >> choice;
switch (choice)
{
//Adds a new book in to the database and increase book count by 1
case 1:
cout << "Bookname : ";
//cin.ignore() is used to clean the buffer to take input
cin.ignore();
//cin.getline is used to take input with space. Enter key is used to finish taking input. 100 is size of input character
cin.getline(book_details[books_count].title, 100);
cout << "Bookcode : ";
cin >> book_details[books_count].code;
book_details[books_count].status = 1;
books_count++;
break;
case 2:
//adds a new user details in to database
cout << "Enter UserId : ";
cin >> tempId;
//flag variable to check whether user exists or not
flag = 1;
for (i = 0; i < 100; i++)
{
if (tempId == user_details[i].id)
{
cout << "UserId already taken ";
flag = 0;
break;
}
}
//if user is not taken creating user id and increase user_count by 1
if (flag)
{
user_details[user_count].id = tempId;
cout << "Enter Username : ";
cin.ignore();
cin.getline(user_details[user_count].name, 100);
user_details[user_count].booksNumber = 0;
user_count++;
}
break;
case 3:
cout << "Please enter your userId : ";
cin >> tempId;
flag = 0;
//check whether user exists or not using flag variable
for (i = 0; i < 100; i++)
{
if (user_details[i].id == tempId)
{
flag = 1;
break;
}
}
//if user exists then print his name and check fof the requested book
if (flag)
{
cout << "Welcome " << user_details[i].name << " ";
//if user has taken less than 5 books
if (user_details[i].booksNumber <= 5)
{
cout << "Please enter book code you want to borrow : ";
cin >> tempCode;
for (j = 0; j < 100; j++)
{
if (book_details[j].code == tempCode && book_details[j].status != 0)
{
book_details[j].status = 0;
user_details[i].booksNumber++;
flag = 0;
break;
}
}
if (flag)
{
cout << "Book not found or it has been currently borrowed ";
}
else
{
cout << "thank you for borrowing a book ";
}
}
else
{
cout << "Username incorrect ;";
}
}
break;
case 4:
// to return the book issued to a user
cout << "Please enter book code :";
cin >> tempCode;
flag = 0;
for (i = 0; i < 100; i++)
{
if (book_details[i].code == tempCode)
{
flag = 1;
break;
}
}
//once book is found then check for user id
if (flag)
{
if (book_details[i].status == 0)
{
cout << "Enter user id ";
cin >> tempId;
flag = 0;
for (j = 0; j < 100; j++)
if (user_details[j].id == tempId)
{
flag = 1;
break;
}
//if user and book details are found
if (flag)
{
user_details[j].booksNumber--;
book_details[i].status = 1;
}
else
{
cout << "User not found ";
}
}
else
{
cout << "Book hasn't been borrowed ";
}
}
else
{
cout << "Invalid code ";
}
break;
case 5:
//Searching a book using bookcode
cout << "Enter book code : ";
cin >> tempCode;
cout << " Book ID Book Name Availability ";
for (i = 0; i < 100; i++)
{
if (book_details[i].code == tempCode)
{
cout << book_details[i].code << "\t" << book_details[i].title << "\t" << book_details[i].status << " ";
break;
}
}
break;
case 6:
//printing details of user using user_details structure
cout << "UserID UserName Books borrowed ";
for (i = 0; i < user_count; i++)
{
cout << user_details[i].id << "\t" << user_details[i].name << "\t" << user_details[i].booksNumber << " ";
}
cout << " ";
break;
case 7:
cout << "ThankYou";
break;
//if user input doesnot match with any of the case then ask him to enter data again
default:
cout << "Please enter valid input ";
}
} while (choice != 7);
return 0;
}
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