【例21.3】字符类型判断

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	邴诚文	8ms	6.4 MiB	C++ 17	317 Bytes	2023-5-2 20:54:25
AC	高新亮	9ms	6.3 MiB	C++ 17	311 Bytes	2023-6-19 21:45:20
AC	赵泽华	9ms	8.3 MiB	C++ 17	267 Bytes	2023-6-2 22:38:33
AC	yuyongchao	9ms	8.3 MiB	C++ 17	294 Bytes	2023-6-2 14:45:56
AC	高新亮	9ms	6.3 MiB	C++ 17	306 Bytes	2023-6-19 21:43:51
AC	单希乐	9ms	6.3 MiB	C++ 17	225 Bytes	2023-6-19 22:41:54