NAME
toupper —
lower case to upper case letter
conversion
SYNOPSIS
#include
<ctype.h>
int
toupper(int
c);
DESCRIPTION
Thetoupper()
function converts a lower-case letter to the corresponding upper-case letter.
If the argument is a lower-case letter, the toupper()
function returns the corresponding upper-case letter if there is one;
otherwise the argument is returned unchanged.
SEE ALSO
isascii(3), isalnum(3), isalpha(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), toascii(3), toupper(3), stdio(3) ascii(7)
STANDARDS
The tolower() function conforms to
ANSI X3.159-1989
(“ANSI C89”).