public char toupper ()

Convert a character to ASCII upper case.

Unlike the standard C library toupper function, this only recognizes standard ASCII letters and ignores the locale, returning all non-ASCII characters unchanged, even if they are upper case letters in a particular character set. Also unlike the standard library function, this takes and returns a char, not an int, so don't call it on eof but no need to worry about casting to uchar before passing a possibly non-ASCII character in.

Example: Convert a character to upper case:

public static int main (string[] args) {
// Output: ``AA1 !``
print ("%c", 'A'.toupper ());
print ("%c", 'a'.toupper ());
print ("%c", '1'.toupper ());
print ("%c", ' '.toupper ());
print ("%c", '!'.toupper ());
print ("%c", '\n'.toupper ());
return 0;

valac --pkg glib-2.0 char.toupper.vala



any character


the result of converting c to upper case. If c is not an ASCII lower case letter, c is returned unchanged.