Step by Step solution about How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Ruby programming language

Both Ruby code snippets define a yesno method that prompts the user to answer a yes or no question. Here's how each snippet works:

First Snippet:

1. system("stty raw -echo"): This line puts the terminal in "raw" mode, which means it processes characters immediately without waiting for the user to press Enter. It also disables echo, so the characters typed by the user are not displayed on the screen.
2. str = STDIN.getc: This line reads a single character from the standard input (STDIN), which is typically the keyboard.
3. ensure: This block ensures that the terminal settings are restored to their original state, even if an exception is raised.
4. The code checks if str is "Y" or "N" and returns true or false accordingly. If it's any other character, it raises an exception.

Second Snippet:

1. require 'io/console': This line requires the io/console library, which provides methods for reading characters from the console without displaying them on the screen.
2. case $stdin.getch: This line uses the getch method from the io/console library to read a single character from the console.
3. The code uses a case statement to check if the character is "Y" or "N" and returns true or false accordingly. If it's any other character, it raises an exception.

Both snippets have the following functionality:

• They prompt the user to answer a yes or no question.
• They read a single character from the console without displaying it on the screen.
• They return true for "Y" and false for "N."
• They raise an exception if an invalid character is entered.

The difference between the two snippets is that the second snippet uses the io/console library, which is a more modern and recommended approach for handling console input in Ruby.

def yesno
  begin
    system("stty raw -echo")
    str = STDIN.getc
  ensure
    system("stty -raw echo")
  end
  if str == "Y"
    return true
  elsif str == "N"
    return false
  else
    raise "Invalid character."
  end
end


require 'io/console'

def yesno
  case $stdin.getch
    when "Y" then true
    when "N" then false
    else raise "Invalid character."
  end
end