ruby中require load include的区别

load: loads a source file every time it is called.每次加载文件的时候都调用

require: loads a source file only once.第一次加载文件的时候调用

include: includes modules,nothing to do with files.加载modules时用，与文件无关.

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chomp: removes any line ending ("\n", "\r", "\r\n")

chop: would remove ANY final character (chomp is usually better) 

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print: outputs a string with no line return
puts: outputs a string with a line return

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# Use gets inside a loop for more user input

result = ""
until result == "quit"
  print "> "
  result = gets.chomp
  puts "I heard: #{result}"
end
puts "Goodbye!"

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