#include <fstream.h>
#include <stdlib.h>
#include <iostream.h>
 
int main()
{
 
	char filename[20] = "a:\filename.dat";
	char data[20];
 
	cout << "Enter the filename: " ;
	cin >> filename;
	cout << endl << endl;
 
	ofstream outfile;
 
	outfile.open(filename);
 
	if (outfile.fail())
	{
		cout << "The file was not successfully opened" << endl;
		exit(1);
	}
 
	cout << "Input name: ";
	cin >> data;
	cout << endl;
 
	outfile<<data;
	outfile.close();
	return 0;
}

cin >> filename;