Thread: Data I/O Problems

This is part of a much larger code but its supposed to do in steps
1]use ifstream take text from a user-specified file
2]store that text as a string
3]close ifstream and use ofstream to export the string to another file
I have a problem because I've tested it a bunch of times but the string seems to never get saved to the new file.

Code:

//*******************DATA CONVERSION******************
    
    if(ans == 3){
           ans = 0;
           
           cout << "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n";
           
           //Reading Data
           
           ifstream inputFile;
           
           cout<<"Data File Name: "; cin>>filename;
           
           inputFile.open(filename);

	       cout << "\nReading Data From " << filename << "...\n";

	       inputFile.getline(data_input, 1000);
	       
	       inputFile.close();
	       
	       //write to data to new file
	       
	       cout<<"Output Data To File: "; cin>> exportfilename;
	       
	       ofstream outputFile(exportfilename, ios::app);
	       
	       outputFile.open(exportfilename);           
           
           cout << "\nWriting To " << exportfilename << "...\n";
           
           outputFile << data_input;
           
           outputFile.close();
           
           system("pause");         
          
           goto main;
           }