Convert uppercase letter to lowercase
Converts c to its lowercase equivalent if c is an uppercase letter and has a lowercase equivalent. If no such conversion is possible, the value returned is c unchanged.
Notice that what is considered a letter may depend on the locale being used; In the default "C" locale, an uppercase letter is any of: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z, which translate respectively to: a b c d e f g h i j k l m n o p q r s t u v w x y z.
In other locales, if an uppercase character has more than one correspondent lowercase character, this function always returns the same character for the same value of c.
In C++, a locale-specific template version of this function (tolower) exists in header <locale>.
- Character to be converted, casted to an int, or EOF.
The lowercase equivalent to c, if such value exists, or c (unchanged) otherwise.
The value is returned as an int value that can be implicitly casted to char.
/* tolower example */
int main ()
char str="Test String.\n";
- Convert lowercase letter to uppercase (function)
- Check if character is uppercase letter (function)
- Check if character is lowercase letter (function)
- Check if character is alphabetic (function)