Array with output based on user input.

[Winged Glyph]

I'm trying to make a single dimensional array that pulls its contents from a file as well an input string from a user. It needs to take the word, break that word into letters, and correlate each letter with its corresponding array designation. (I hope that made sense.)
As an example, if I input the word "cat" it needs to output "Charlie Alpha Tango". My array has 26 components labeled A-Z. My problem is that whenever I input a word, no matter what it is, I get "Zulu Uniform Lima". I can't make the user input correspond with its correct letter in the array. I've checked around on this site and others and can't find a solution.
Here's my code:

#include <iostream>
#include <string>
#include <fstream>
#include <cctype>

using namespace std;

int stop;
int index;

int main()
{
	string word;
	string UserInput;
	ifstream inFile;
	ofstream outFile;
	outFile.open("C://Users/Eli/Documents/Visual Studio 2010/ICAO Output.txt");
	inFile.open("C://Users/Eli/Documents/Visual Studio 2010/ICAO.txt");
	string letters[26];
	int limit;
	int counter;

	cout << "Please enter a word you would like translated into the ICAO alphabet." << endl;
	cin >> UserInput;
	outFile << UserInput;
	
	if (!inFile)
		cout << "File did not open!" << endl;

	
	
	inFile >> word;

	while (inFile)
	{
		letters[index] = word;
		inFile >> word;
		index++;
	}
	
	for (counter = 0; counter < 26; counter++)
	{	
		cout << (char) (counter + 'A') << ": " << letters[counter] << endl;
		outFile << (char) (counter + 'A') << ": " << letters[counter] << endl;
	}

	cout << endl << "Please enter a word." << endl;
	cin >> UserInput;
	limit = UserInput.length();
	

	for (counter = 0; counter < limit; counter++)
	{
		index = toupper(word.at(counter)) - 'A';
		cout << letters[index] << " ";
		outFile << letters[index] << " ";
	}

	inFile.close();
	outFile.close();


	cin >> stop;
	return 0;
}

[JockX]

One thing is that index is left uninitialized. Should start from 0.

[Winged Glyph]

Thanks for the suggestion. That brings me one step closer, however I am still having the same problem.

[JockX]

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cout << endl << "Please enter a word." << endl; cin >> UserInput; limit = UserInput.length(); for (counter = 0; counter < limit; counter++) { index = toupper(word.at(counter)) - 'A'; cout << letters[index] << " "; outFile << letters[index] << " "; }

Please enter a word. Dupa Zulu Uniform Lima Uniform

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cout << endl << "Please enter a word." << endl; cin >> UserInput; limit = UserInput.length(); for (counter = 0; counter < limit; counter++) { index = toupper(UserInput.at(counter)) - 'A'; cout << letters[index] << " "; outFile << letters[index] << " "; }

Please enter a word. Dupa Delta Uniform Papa Alpha

[Winged Glyph]

Thank you so much JockX! If I could bake you a pan of cookies and send them to you digitally, I would. I've been trying to solve this for almost a week now. You're amazing!