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21 函数center，参数words def center(words) do #按长度从小到大来排序 words = Enum.sort_by words,&String.length/1 #求出最大值 max_length = String.length (List.last words) #每一个x，都传给center_word函数 for x <- words,do: IO.puts center_word(x,max_length) end #定义center_word函数，参数为word和length def center_word(word,length) do #算出最大长度减去word的长度，再除以二，filler等于该数值个空格 filler = String.duplicate(" ",div(length - String.length(word),2)) #在word的前后都加上这么多空格 filler <> word <> filler end end
