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namncn/ex

Created January 18, 2017 11:15
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ex
def multiply_by_two (n = "không có giá trị cung cấp")
if (n.is_a? (Integer))
n * 2
khác
nâng ArgumentError.new ( "Xin vui lòng cung cấp một số hợp lệ")
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