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並前往http://manpages.ubuntu.com/manpages/bionic/pt/man3/isalpha.3.html

isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph ...

isalnum() checks for an alphanumeric character; it is equivalent to (isalpha(c) || isdigit(c)). isalpha() checks for an alphabetic character; in the standard "C ...

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