本内容遵循CC 4.0 BY-SA版权协议 C语言的库中，提供了一系列能操作字符和字符串的库函数，下面我们来认识一下这些函数。 一、字符分类函数 这些函数可以判断字符是属于什么类型的，他们都需要包含头文件<ctype.h>,以下是一些字符分类函数. isupper 大写字母A~Z ...

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