大小写转换- The big small letter transforms

89C51单片机汇编语言2×8键盘扫描源程序-89C51 single-chip 2 × 8 assembly language source code keyboard scanner

c语言病毒源程序代码，便于使用c语言编程者在使用汇编语言的过程中发现并抵制病毒文件。-c language virus source code, easy to use c language programming in the process of assembly language and to resist the virus file.