Usually you don't want to hard-code filenames into your projects: you want to let the user decide what the filenames should be. Here is an easy way to do just that.
First, make sure you include both fstream and iomanip.
#include <fstream>
#include <iomanip>
In your main or other file accessing function, request an input filename from the user.
string inputFilename;
cout << "Enter input filename: ";
cin >> inputFilename;
Attempt to open the file.
ifstream fin;
fin.open(inputFilename.c_str());
Check to see that the file does indeed exist. If it doesn't, you should tell the user and beat a hasty retreat.
if ( !fin )
{
cout << inputFilename << " does not exist.\n";
fin.close();
}
Oh, so you want to write a file, now, do you?
string outputFilename;
cout << "Enter output filename: ";
cin >> outputFilename;
ofstream fin;
fin.open(outputFilename.c_str());
And one more thing: always remember to close your files before leaving the program!
fin.close();
fout.close();
