Question

我有以下代码。为了使代码正常工作，它应该读取这些行并将其写入控制台。我目前只有错误：文件的第一行不是数字。

任何可能的帮助都会很棒。

def write(aFile, number)

  aFile.puts(number)
  index = 0
  while (index <= number)
   aFile.puts(index)
   index += 1
  end
end


def read(aFile)


  count = aFile.gets
  if (is_numeric?(count))
    count = count.to_i
  else
    count = 0
    puts "Error: first line of file is not a number"
  end

  index = 0
  while (count < index)
    line = aFile.gets
    puts "Line read: " + line
    index += 1
  end
end


def main
  aFile = File.new("mydata.txt", "w") 
  if aFile  
    write(aFile, 10)
    aFile.close
    aFile = File.new("mydata.txt", "r") 
    read(aFile)
    aFile.close
  else
    puts "Unable to open file to write or read!"
  end
end

def is_numeric?(obj)
  if /[^0-9]/.match(obj) == nil
    true
  end
  false
end

main

Answer 1

请检查以下内容，

count = aFile.gets
if (is_numeric?(count))
  count = count.to_i
else
  count = 0
  puts "Error: first line of file is not a number"
end

当您读取文件行时，您总是读取文本/字符串中的行（甚至文件中的数字）。因此，您始终处在else块中。

Ruby读写文件

1 个答案: