IN C++ Help to fix code Library management program. Error is when i type a letter...
IN C++ Help to fix code
Library management program. Error is when i type a letter into options menu the code breaks.
after your edits, the code should still run as normal.
CODE:
#include<iostream>
using namespace std;
//structure to store library data
class BookDetails{
public:
struct library
{
int code;
char title[20];
int status;
};
library book_details[100];
};
//structure to store user data
class UserDetails:public BookDetails{
public:
struct users
{
int id;
char name[20];
int booksNumber;
};
users user_details[100];
};
int main()
{
UserDetails ob1;
UserDetails *ob;
ob=&ob1;
int tempId, i, flag = 0, j;
char tempName[20];
int tempCode;
//variable to hold 100 userdetails
//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 \n";
cout << "1. Add a new book\n";
cout << "2. Add a new user\n";
cout << "3. Borrow a book\n";
cout << "4. Return a book\n";
cout << "5. Search a book\n";
cout << "6. Displays users and number of books they have\n";
cout << "7. Exit\n";
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(ob->book_details[books_count].title,100);
cout << "Bookcode : ";
cin >> ob->book_details[books_count].code;
ob->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 == ob->user_details[i].id)
{
cout << "UserId already taken\n";
flag = 0;
break;
}
}
//if user is not taken creating user id and increase user_count by 1
if (flag)
{
ob->user_details[user_count].id = tempId;
cout << "Enter Username : ";
cin.ignore();
cin.getline(ob->user_details[user_count].name, 100);
ob->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 (ob->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 " << ob->user_details[i].name << "\n";
//if user has taken less than 5 books
if (ob->user_details[i].booksNumber <= 5)
{
cout << "Please enter book code you want to borrow : ";
cin >> tempCode;
for (j = 0; j < 100; j++)
{
if (ob->book_details[j].code == tempCode && ob->book_details[j].status != 0)
{
ob->book_details[j].status = 0;
ob->user_details[i].booksNumber++;
flag = 0;
break;
}
}
if (flag)
{
cout << "Book not found or it has been currently borrowed\n";
}
else
{
cout << "thank you for borrowing a book\n";
}
}
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 (ob->book_details[i].code == tempCode)
{
flag = 1;
break;
}
}
//once book is found then check for user id
if (flag)
{
if (ob->book_details[i].status == 0)
{
cout << "Enter user id: ";
cin >> tempId;
flag = 0;
for (j = 0; j < 100; j++)
if (ob->user_details[j].id == tempId)
{
flag = 1;
break;
}
//if user and book details are found
if (flag)
{
ob->user_details[j].booksNumber--;
ob->book_details[i].status = 1;
}
else
{
cout << "User not found\n";
}
}
else
{
cout << "Book hasn't been borrowed\n";
}
}
else
{
cout << "Invalid code\n";
}
break;
case 5:
//Searching a book using bookcode
cout << "Enter book code : ";
cin >> tempCode;
cout << " Book ID Book Name Availability \n";
for (i = 0; i < 100; i++)
{
if (ob->book_details[i].code == tempCode)
{
cout << ob->book_details[i].code << "\t" << ob->book_details[i].title << "\t" << ob->book_details[i].status << "\n";
break;
}
}
break;
case 6:
//printing details of user using user_details structure
cout << "UserID UserName Books borrowed\n";
for (i = 0; i < user_count; i++)
{
cout << ob->user_details[i].id << "\t" << ob->user_details[i].name << "\t" << ob->user_details[i].booksNumber << "\n";
}
cout << "\n";
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 \n";
}
} while (choice != 7);
return 0;
}
Homework Answers
//Modified Code
#include<iostream>
#include<limits>
using namespace std;
//structure to store library data
class BookDetails{
public:
struct library
{
int code;
char title[20];
int status;
};
library book_details[100];
};
//structure to store user data
class UserDetails:public BookDetails{
public:
struct users
{
int id;
char name[20];
int booksNumber;
};
users user_details[100];
};
int main()
{
UserDetails ob1;
UserDetails *ob;
ob=&ob1;
int tempId, i, flag = 0, j;
char tempName[20];
int tempCode;
//variable to hold 100 userdetails
//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 \n";
cout << "1. Add a new book\n";
cout << "2. Add a new user\n";
cout << "3. Borrow a book\n";
cout << "4. Return a book\n";
cout << "5. Search a book\n";
cout << "6. Displays users and number of books they have\n";
cout << "7. Exit\n";
while(1){
cout << "Enter your choice : ";
cin>>choice;
if(cin.fail()){
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(),'\n');
cout<<"You have entered wrong
input.Please enter a valid Integer\n";
}
else break;
}
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(ob->book_details[books_count].title,100);
cout << "Bookcode : ";
cin >> ob->book_details[books_count].code;
ob->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 == ob->user_details[i].id)
{
cout << "UserId already taken\n";
flag = 0;
break;
}
}
//if user is not taken creating user id and increase user_count by 1
if (flag)
{
ob->user_details[user_count].id = tempId;
cout << "Enter Username : ";
cin.ignore();
cin.getline(ob->user_details[user_count].name, 100);
ob->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 (ob->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 " << ob->user_details[i].name << "\n";
//if user has taken less than 5 books
if (ob->user_details[i].booksNumber <= 5)
{
cout << "Please enter book code you want to borrow : ";
cin >> tempCode;
for (j = 0; j < 100; j++)
{
if (ob->book_details[j].code == tempCode && ob->book_details[j].status != 0)
{
ob->book_details[j].status = 0;
ob->user_details[i].booksNumber++;
flag = 0;
break;
}
}
if (flag)
{
cout << "Book not found or it has been currently borrowed\n";
}
else
{
cout << "thank you for borrowing a book\n";
}
}
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 (ob->book_details[i].code == tempCode)
{
flag = 1;
break;
}
}
//once book is found then check for user id
if (flag)
{
if (ob->book_details[i].status == 0)
{
cout << "Enter user id: ";
cin >> tempId;
flag = 0;
for (j = 0; j < 100; j++)
if (ob->user_details[j].id == tempId)
{
flag = 1;
break;
}
//if user and book details are found
if (flag)
{
ob->user_details[j].booksNumber--;
ob->book_details[i].status = 1;
}
else
{
cout << "User not found\n";
}
}
else
{
cout << "Book hasn't been borrowed\n";
}
}
else
{
cout << "Invalid code\n";
}
break;
case 5:
//Searching a book using bookcode
cout << "Enter book code : ";
cin >> tempCode;
cout << " Book ID Book Name Availability \n";
for (i = 0; i < 100; i++)
{
if (ob->book_details[i].code == tempCode)
{
cout << ob->book_details[i].code << "\t" << ob->book_details[i].title << "\t" << ob->book_details[i].status << "\n";
break;
}
}
break;
case 6:
//printing details of user using user_details structure
cout << "UserID UserName Books borrowed\n";
for (i = 0; i < user_count; i++)
{
cout << ob->user_details[i].id << "\t" << ob->user_details[i].name << "\t" << ob->user_details[i].booksNumber << "\n";
}
cout << "\n";
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 \n";
}
} while (choice != 7);
return 0;
}
//sample output
:
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