Thread: How to write class array to file

Hello. I am trying to write the content of a class array to a file but I keep getting this error:
no operator "<<" mathces these operands.
This is where im getting the error:

Code:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
#include "Node.h"
#include "Stock.h"
#include "BinarySearchTree.h"
int main()
{
    BinarySearchTree<Stock> tree;
    Stock company[23];
    ifstream file;


    string name,
        symbol;
    double price = 0;

    file.open("data.txt");
    if (!file)
        cout << "Can not open file.\n";
//read data from file and store into class object, then store into binary search tree
    while (!file.eof())
    {
        for (int i = 0; i < 20; i++)
        {
            getline(file, line, '\n');
            company[i].setName(line);
            getline(file, line, '\n');
            company[i].setSymbol(line);
            file >> dbline;
            company[i].setPrice(dbline);
            file.get();
        }
    }
    
    file.close();
//other code blah doesn't matter
//now this is where i get the error
        else if (choice == QUIT)
        {
            cout << endl;
            cout << "Now write data to file...\n";


            file.open("data.txt", ios::out);
            for (int i = 0; i < 23; i++)
            {
                file << company[i].getName();    //i get the error one these 3 lines
                file << company[i].getSymbol();
                file << company[i].getPrice();
            }
            file.close();
            cout << "Goodbye.\n";
        }


}

Why am I getting this error?

I also overloaded the << operator:

Code:

ostream &operator<<(ostream& os, const Stock& s)
{
    os << s.compName << endl << s.compSymbol << endl << s.compPrice << endl;


    return os;
}

In main(), in the loop to write data to the file, i tried just writing

Code:

file << company[i]

but i still got the same error message.

I also have another question just out of curiosity. If I wanted to store the contents of the binary search tree instead of the class array into the file, how could I go about doing that instead?

You declared ifstream to be an ifstream, but you're trying to use it as if it were an output stream.