My code is written twice for uncomprehensible reasons

Question

This code is written in C++ and for reasons that I don\'t quite understand it is written twice. I would expect that after inputting a random char it would display the char once

Answer 1

It happens because cin.get() reads new-line character too. Try to press Enter without any symbols or type some string, like abc. You need to handle it, e.g.:

while (letter = cin.get()) {
    if (!isalpha(letter)) { continue; }
    // handling user inputted alpha
}