在程序下半部分的gets部分，终端不是要求我输入而是自动接受输入。我无法理解这是如何发生的。
该代码是：
puts "Welcome to my automatic file opener"
puts "Version - 2.0"
if ARGV[0] && ARGV[1] #to ensure Arguements are given as input
old_data = File.open(ARGV[0]).readlines
new_data = File.open(ARGV[1]).readlines
class Differentiator
def old_stuff
puts "the old files are:-"
puts old_data
end
def new_stuff
puts "The new files are:-"
puts new_data
end
def updated_list
puts "The newly added files are:-"
newly_added = new_data - old_data
puts newly_added
end
def deleted_list
puts "The deleted files are:-"
deleted_data = old_data - new_data
puts deleted_data
end
def stable_list
puts "The unchanged/stable files are:-"
unchanged_data = new_data - newly_added
puts unchanged_data
end
end#end of class
while true
puts "Choose your option:"
puts "1.Old Files of System"
puts "2.New Files of System"
puts "3.Added Files of System"
puts "4.Deleted Files of System"
puts "5.Stable Lists"
puts "6.Exit"
print " Please Choose your Output:-"
**option_method=gets.chomp.to_i**
filecase1 = Differentiator.new
if option_method == 1
filecase1.old_stuff
end
if option_method == 2
filecase1.new_stuff
end
if option_method == 3
filecase1.updated_list
end
if option_method == 4
filecase1.deleted_list
end
if option_method == 5
filecase1.stable_list
end
if option_method == 6
break
exit
end
if option_method != (1..6)
puts "Sorry,Wrong Input"
end
end
else
puts "The Right Method of Usage is : ruby <scriptname>.rb old_file new_file"; exit;
end