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LETTERtoupperULETTER
Converts lowercase to uppercase letters.
#include <ctype.h>
r = toupper(ch);
int r;
int ch;
Portability
ANSI
Description
If the character passed is an lowercase letter it will be converted to
uppercase, otherwise it remains unchanged. For portability reasons only the
ASCII letters from "a" to "z" will be converted, eg. the German Umlauts (äöüß)
remain unchanged.
Returns
The converted character.
See also
tolower