利用循环左移函数流水灯
......................\ex111
......................\ex111.LST
......................\ex111.M51
......................\ex111.OBJ
......................\ex111.Opt
......................\ex111.Uv2
......................\ex111.c
......................\ex111.hex
......................\ex111.lnp
......................\ex111.plg
......................\ex111_Uv2.Bak