I am trying to get a simple Ruby program to run correctly.
I need it to take user input until the user types q for "quit". It also needs to capitalize the last four letters of the users input and, with input under four letters, to capitalize all letters.
It only works for input over four letters, and, when I type "quit", it gets a nil error.
See the code below.
I am using Eclipse with Ruby 2.0.
puts ("\n" * 10)
loop do
puts "Please enter a word. (To quit type q.)" # Gets the users input
puts ("\n" * 3) #Scroll the screen 3 times
str = gets.chomp #Collect the player's response
puts ("\n" * 3) #Scroll the screen 3 times
length = str.length # Counts length of string
str = str[0..(length-5)] + str[(length-4)..length].upcase # Only makes last four letters of user input capitalized
puts str # Shows on screen the user input with capitalized last four letters
puts ("\n" * 3) #Scroll the screen 3 times
break if str == "q"
end
You need to pay attention to [] when you write code like this:
str = str[0..(length-5)] + str[(length-4)..length].upcase
If an index is negative, it is counted from the end of string. For example:
str = "abcde"
str[-1] # => "e"
str[-2] #=> "d"
See String.[] for more details.
With regard to your question, here is my logic:
break if str == "q"
if str.length < 4
str = str.upcase
else
str = str[0...-4] + str[-4..-1].upcase
end
p str