03-22-2011
Tks for your reply, but the same problem when I enter character from 'b' -> 'z' the result is uppercase too.
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LEARN ABOUT ULTRIX
_toupper
conv(3) Library Functions Manual conv(3)
Name
toupper, tolower, _toupper, _tolower, toascii - translate characters
Syntax
#include <ctype.h>
int toupper(c)
int c;
int tolower(c)
int c;
int _toupper(c)
int c;
int _tolower(c)
int c;
int toascii(c)
int c;
Description
The functions and have as their domain the range of the function. If the argument to represents a lowercase letter, the output from the
function is the corresponding uppercase letter. If the argument to represents an uppercase letter, the result is the corresponding lower-
case letter.
The case of c depends on the definition of the character in the language database. Because the case of a character can vary between lan-
guage databases, the case of c depends on what language database is in use. Specifically, the case of arguments depends on what property
tables are associated the LC_CTYPE category. Property tables are associated with the LC_CTYPE category by a successful call to the func-
tion that includes the LC_CTYPE category. If no successful call to define LC_CTYPE has occurred or if the character case information is
unavailable for the language in use, the rules of the ASCII coded character set determine the case of arguments.
If the argument to the function does not have the uppercase attribute, returns the argument unchanged. Likewise, if the argument to the
function does not have the lowercase attribute, returns it unchanged.
The macros and have the same affect as and The difference is that the argument to the macros must be an ASCII character (that is, a charac-
ter in the domain -1 to 127) and the argument must have the appropriate case. Arguments to must have the uppercase attribute and arguments
to must the lowercase attribute. The result of supplying arguments to these macros that are outside the domain or do not have the appropri-
ate case is undefined. These macros operate faster than the and functions.
The macro converts its argument to the ASCII character set. The macro converts its argument by truncating the numerical representation of
the argument so that it is between -1 and 127. You can use this macro when you move an application to a system other than an ULTRIX system.
International Environment
LC_CTYPE If this environment variable is set and valid, uses the international language database named in the definition to determine
character classification rules.
See Also
ctype(3int), setlocale(3), getc(3)
conv(3)