NAME
toupper
- lower case to upper case letter conversion
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
int
toupper(int c)
DESCRIPTION
The
toupper()
function converts a lower-case letter to the corresponding
upper-case letter.
RETURN VALUES
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
ctype(3),
isalnum(3),
isalpha(3),
isascii(3),
iscntrl(3),
isdigit(3),
isgraph(3),
islower(3),
isprint(3),
ispunct(3),
isspace(3),
isupper(3),
isxdigit(3),
stdio(3),
toascii(3),
ascii(7)
STANDARDS
The
toupper()
function conforms to
ANSI X3.159-1989 (``ANSI C89'') .
CAVEATS
The argument to
toupper()
must be
EOF
or representable as an
otherwise, the behavior is undefined.
See the
CAVEATS
section of
ctype(3)
for more details.