std::tolower
STD:收费者
Defined in header | | |
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int tolower( int ch | | |
根据当前安装的C语言环境定义的字符转换规则将给定字符转换为小写。
在默认的“C”区域设置中,以下大写字母ABCDEFGHIJKLMNOPQRSTUVWXYZ
被替换为相应的小写字母。abcdefghijklmnopqrstuvwxyz
...
参数
ch | - | character to be converted. If the value of ch is not representable as unsigned char and does not equal EOF, the behavior is undefined |
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返回值
小写版本ch
或未经修改ch
如果在当前C语言环境中没有列出小写版本。
例
二次
#include <iostream>
#include <cctype>
#include <clocale>
int main()
{
unsigned char c = '\xb4'; // the character Ž in ISO-8859-15
// but ´ (acute accent) in ISO-8859-1
std::setlocale(LC_ALL, "en_US.iso88591"
std::cout << std::hex << std::showbase;
std::cout << "in iso8859-1, tolower('0xb4') gives "
<< std::tolower(c) << '\n';
std::setlocale(LC_ALL, "en_US.iso885915"
std::cout << "in iso8859-15, tolower('0xb4') gives "
<< std::tolower(c) << '\n';
}
二次
产出:
二次
in iso8859-1, tolower('0xb4') gives 0xb4
in iso8859-15, tolower('0xb4') gives 0xb8
二次
另见
toupper | converts a character to uppercase (function) |
---|---|
tolower(std::locale) | converts a character to lowercase using the ctype facet of a locale (function template) |
towlower | converts a wide character to lowercase (function) |
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