#include <iostream>
#include <fstream>
#include <string>
 
using namespace std;
 
int main()
{
    ofstream fout;
    string input;
    string title,author,category;
    float price;
 
    fout.open("library.txt");
    if (!fout.good())
    {
        cerr << "Error creating file";
	}
 
	cout << "Title: " ;
	getline(cin, input); 
	title = input;
 
	cout << "Author: " ;
	getline(cin, input); 
	author = input;
 
	cout << "Category: ";
	getline(cin, input);
    category = input;
 
	cout << "Price: " ;
	getline(cin, input); 
	istringstream strPrice(input);
    strPrice >> price;
 
    fout<< title << '\t' << author << '\t' << category << '\t' << price << "\n";   
    fout.close();  
}

fout.open("library.txt");
fout.seekp(ios::end);
if (!fout.good())
.
.
.

fout.open("library.txt", ios::out | ios::ate);
    if (!fout.good())
.
.
.

fout.open("library.txt");
if( fout.is_open())
{
    fout.seekp(0,ios_base::end);
    // blabla
}

fout.open("library.txt");