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.