std::tolower

 

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isalnum isalpha islower isupper isdigit isxdigit isblank (C++11)	iscntrl isgraph isspace isprint ispunct tolower toupper
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Defined in header <cctype>
int tolower( int ch );

Converts the given character to lowercase.

Parameters

ch

-

character to be converted

Return value

Lowercase version of ch or unmodified ch if no lowercase version is listed in the current C locale.

See also

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)