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C-Primer-5th · Build Status license

编译器声明(C++11)

  • Linux:g++ 5.0+
g++ some_ex.cpp -std=c++11 -o some_ex

目录

常用函数

cctype系列

函数名称 返回值
isalnum() 如果参数是字母数字,即字母或数字,该函数返回true
isalpha() 如果参数是字母,该函数返回真
isblank() 如果参数是空格或水平制表符,该函数返回true
iscntrl() 如果参数是控制字符,该函数返回true
isdigit() 如果参数是数字(0~9),该函数返回true
isgraph() 如果参数是除空格之外的打印字符,该函数返回true
islower() 如果参数是小写字母,该函数返回true
isprint() 如果参数是打印字符(包括空格),该函数返回true
ispunct() 如果参数是标点符号,该函数返回true
isspace() 如果参数是标准空白字符,如空格、进纸、换行符、回车、水平制表符或者垂直制表符,该函数返回true
isupper() 如果参数是大写字母,该函数返回true
isxdigit() 如果参数是十六进制的数字,即0~9、a~f、A~F,该函数返回true
tolower() 如果参数是大写字符,则返回其小写,否则返回该参数
toupper() 如果参数是小写字母,则返回其大写,否则返回该参数

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