IO: sketch that tests different methods for reading keyboard input one line at a time.

gistfile1.rb

# filename: io_line.rb
# sketch that tests different methods for reading keyboard input one line at a time.

# find out what approach to use to read the file
puts
puts "Reading data from the keyboard using line-based approach."
puts "Select a method to read in the keyboard input:"
puts "	1) each method"
puts "	2) gets method"
puts "	3) readline method"
puts "	** to quit from playing around type any number"
puts "	** the read and readlines method are designed to until the end of a file"
puts "	   these methods are not appropriate for keyboard input"
input = STDIN.gets.to_i
puts

# if input was 1 then use each method
if input == 1
	puts "** EACH method "
	STDIN.each do |n| 
		if n =~ /[a-z]+/; puts n
		else; break; end
	end

# if input was 2 then use gets method
elsif input == 2
	puts "** GETS method:"
	line = ""
	puts line while ((line = STDIN.gets) =~ /[a-z]+/)

# if input was 3 then use readline method
elsif input == 3
	puts "** READLINE method:"
	line = ""
	puts line while ((line = STDIN.readline) =~ /[a-z]+/)

# if input did not match then display error message
else 
	puts "** ERROR: your input didn't make sense"
end

puts