汇编语言课程设计修改文件扩展名

此程序是大三时做的汇编语言课程设计，实现的功能是修改目录下面的文件的扩展名。 运行时的输入如下所示： PLEASE INPUT PATHNAME: F:\test\ PLEASE INPUT THE KZM YOU WILL CHANGE: txt PLEASE INPUT THE KZM YOU WANT TO CHANGE TO BE: zzf NAME HAVE CHANGED THE NEW FILE NAMES CREATED JUST NOW: A.ZZF