Naming an output file from a user entered string - c++

Question

This is my first project in C++. I took a course using C previously and file I/O seems to differ a little.
The project requires the user to enter a name for saving the output file.
I know I should use ofstream which should look like this:
ofstream myfile;
myfile.open ("example.txt");
myfile << "Writing this to a file.\n";
myfile.close();
I've bolded the snippet that's causing confusion.
How can I name the file from a string entered by the user?
*Note, C type string, so an array of characters.
#include < string > is not allowed

Answer 1

As my other answer has got a negative vote, here's another solution without #include <string>
You can just save the input from the user in a temporary char array and then save it to a string variable std::string.
Includes that are necessary:
#include <iostream>
#include <fstream>
Saving an input from an user into a char array:
char input[260];
cin >> input;
To then save it in a string variable just do this:
string filename = input;
To open a file stream you'll need to use std::ofstream. Please keep in mind, that the file is created in the same folder as the project/application is.
std::ofstream outfile (filename + "." + "file extension");
And as you already know this outfile.open(); opens the file.
With outfile << "hello"; you can write into the file.
To close the file, use outfile.close(); to close the file.
Here you have a little example code:
#include <iostream>
#include <fstream>
using namespace std;
void main()
{
char input[260];
cin >> input;
string filename = input;
ofstream outfile(filename + "." + "txt");
outfile << "hello";
outfile.close();
}
I hope this helps.
Regards.

Answer 2

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string path;
string name;
string h_path;
string text;
void create() {
ofstream file(h_path, ios::app);
if (!file.fail()) {
file << text;
file.close();
}
}
int main() {
cout << "please enter path(c:\\folder\): ";
cin >> path;
cin.ignore();
path = path + "/";
cout << "please enter the name of the file (test.txt): ";
getline(cin, name);
cout << "content of the file: ";
getline(cin, text);
h_path = path + name;
create();
cout << "new file created";
cout << h_path;
}

Answer 3

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main()
{
string fileName;
cin >> fileName;
ofstream myfile;
myfile.open(fileName);
myfile << "Writing this to a file.\n";
myfile.close();
}