Man Tolower en anglais
TOUPPER(3)                 Linux Programmer's Manual                TOUPPER(3)



 

NAME


       toupper, tolower - convert letter to upper or lower case

 

SYNOPSIS


       #include 

       int toupper(int c);
       int tolower(int c);

 

DESCRIPTION






       toupper() converts the letter c to upper case, if possible.

       tolower() converts the letter c to lower case, if possible.

       If c is not an unsigned char value, or EOF, the behavior of these func-
       tions is undefined.

 

RETURN VALUE


       The value returned is that of the converted letter, or c if the conver-
       sion was not possible.

 

CONFORMING TO


       C89, C99, 4.3BSD.

 

BUGS


       The details of what constitutes an uppercase or lowercase letter depend
       on the current locale.  For example, the default "C"  locale  does  not
       know about umlauts, so no conversion is done for them.

       In some non-English locales, there are lowercase letters with no corre-
       sponding uppercase equivalent; the German sharp s is one example.

 

SEE ALSO


       isalpha(3), setlocale(3), towlower(3), towupper(3), locale(7)

 

COLOPHON


       This page is part of release 3.05 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



GNU                               1993-04-04                        TOUPPER(3)