How to see if a user already has a file? For example, I want this to make a text file and if a user already has a file in their system for it not to work and send an error.

```cpp
#include <iostream>
#include <fstream>
using namespace std;

int main() {
    int number;
    cout << "This is just a test. Insert the number 10 to make it work" << endl;
    cin >> number;
    if (number == 10) {
        ofstream read("read.txt");
    }
}

```