NAME
toupper —
lower case to upper case letter
conversion
LIBRARY
library “libc”
SYNOPSIS
#include
<ctype.h>
int
toupper(int
c);
DESCRIPTION
Thetoupper()
function converts a lower-case letter to the corresponding upper-case letter.
The argument must be representable as an unsigned char
or the value of EOF.
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.
COMPATIBILITY
The 4.4BSD extension of accepting
arguments outside of the range of the unsigned char
type in locales with large character sets is considered obsolete and may not
be supported in future releases. The towupper()
function should be used instead.
SEE ALSO
STANDARDS
The toupper() function conforms to
ISO/IEC 9899:1990
(“ISO C90”).