// This program demonstrates reading from one file
// and writing to a second file.
#include <iostream>
#include <fstream>
#include <cctype>                   // Needed for the toupper function
using namespace std;

int main()
{
    // Variables needed to read and write files.
    const int LENGTH = 81;
    ifstream inFile;                // For input file
    ofstream outFile("out.txt");    // For output file
    char fileName[LENGTH], ch, ch2;

    // Open input file
    cout << "Enter a file name: ";
    cin >> fileName;
    inFile.open(fileName);
    if (!inFile)
    {
        cout << "Cannot open " << fileName << endl;
        return 0;
    }

    // Read characters from  input file and write
    // uppercased versions of the character to the
    // output file.
    while (inFile.get(ch))
    {
        ch2 = toupper(ch);
        outFile.put(ch2);
    }

    // Close files.
    inFile.close();
    outFile.close();
    cout << "File conversion done.\n";

    return 0;
}