* 解决末行无法打印问题 * Apply suggestions from code review Co-authored-by: ᴜɴᴋɴᴡᴏɴ <u@gogs.io>
修复示例打开文件未关闭错误
Exercise 12. 6:cat_numbered.go Extend the example from listing 12.8 to process a flag which indicates that every line read should be preceded by a line number in the output. Test it out with: cat –n test