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Reading from arguments with ARGV

suggest change 
number1 = ARGV[0]
number2 = ARGV[1]
puts number1.to_i + number2.to_i
## run with: $ ruby a_plus_b.rb 1 2
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File I/O:
*File and IO Operations
*Open and closing a file
*Writing a string to a file
*get a single char of input
*Reading from STDIN
*Reading from arguments with ARGV
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