Enter a character: 2The character is not an alphabetic character.

如果输入的字符是字母，则程序检查是大写还是小写。

A coded character set whose character set is an alphabetic character set.

一种编码字符集，它的字符集是一种字母字符集。

The first character of the string must be an alphabetic character.

字串的第一个字元必须是字母字元.

For example , the user enters an alphabetic character when a digit is required.

例如，当需要数字时，用户输入了字母字符。

A control symbol consists of a backslash followed by a single, non alphabetic character.

一个控制符号由一个反斜杠以及紧跟着它的一个简单的非字母的字符.