How do i create a external file containing previously entered strings?
My program (a gtin verifier) asks the user to enter a gtin, which it saves as a string. After that the Method returns a true or false, depending on if the code is valid or not. for efficiency's sake i want it to save every input of the user and the true/false result to a file so if someone enters a code that was already calculated it just reads the result from the file instead of having to acutally calculate it, i'll send the code in a bit
