不接广告么

写两个方法辣

#第一个 
def output(filename)
    str = ""
    File.open(filename,"r+"){|f|
          f.each_line{|line|
               str += line.gsub(/,/,"\n")
          }
    }
   str
end
result = output("example.txt")

#第二个
def input(filename,str)
    File.open(filename,"w"){|f|
        f.write str
}
end
input("example.txt",result)