<TITLE>toupper</TITLE>
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<h3>TOUPPER(3) Linux Programmer's Manual TOUPPER(3)
</h3>
<h3>NAME
</h3> toupper, tolower - convert letter to upper or lower case
<h3>SYNOPSIS
</h3> #include <ctype.h>
int toupper (int c);
int tolower (int c);
<h3>DESCRIPTION
</h3> toupper() converts the letter c to upper case, if possi-
ble.
tolower() converts the letter c to lower case, if possi-
ble.
<h3>RETURN VALUE
</h3> The value returned is that of the converted letter, or c
if the conversion was not possible.
<h3>CONFORMS TO
</h3> ANSI - C, BSD 4.3
<h3>BUGS
</h3> 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 con-
version is done for them.
In some non - English locales, there are lowercase letters
with no corresponding uppercase equivalent; the German
sharp s is one example.
</pre>
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<h3>SEE ALSO
</h3><p>
<a href=../EXAMPLES/is_examp.c>isalpha</a>,
<a href=setlocale.htm>setlocale</a>,
<a href=locale.htm>locale</a>,
<pre>
<h3>GNU April 4, 1993 1
</h3>
</pre>
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