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。
String contains non-numeric character(s). Please enter a valid number.
输入格式化源字符串数据所需的参数。
The user can enter the next editable character, which in this example is a digit.
使用者可以输入下一个可编辑的字元，在此范例中为数字。
The user can enter the next editable character, which in this example is a digit.
使用者可以输入下一个可编辑的字元，在此范例中为数字。
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