.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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.\" Modified Sat Jul 24 17:45:39 1993 by Rik Faith (faith@cs.unc.edu)
.TH TOUPPER 3  "4-Abril-1993" "GNU" "Manual del Programador de Linux"
.SH NOMBRE
toupper, tolower \- convierte letras a mayúsculas o minúsculas
.SH SINOPSIS
.nf
.B #include <ctype.h>
.sp
.BI "int toupper (int " "c" ");"
.nl
.BI "int tolower (int " "c" ");"
.fi
.SH DESCRIPCIÓN
.B toupper()
convierte la letra
.I c
a mayúsculas, si es posible.
.PP
.B tolower()
convierte la letra
.I c
a minúsculas, si es posible.
.SH "VALOR DEVUELTO"
El valor devuelto es la letra "convertida", o
.I c
si no se pudo realizar la conversión.
.SH "CONFORME A"
ANSI - C, BSD 4.3
.SH FALLOS
Hay que tener en cuenta que los detalles de qué es mayúscula o minúscula dependen de cada lengua concreta. [Si sabes traducir esto que viene: c.c.portela@ieee.org] For example, the default
.B """C"""
locale does not know about umlauts, so no conversion is done for them.
.PP
 Del mismo modo, también existen letras minúsculas sin su equivalénte mayúsculo (s "sharp" alemana).
.SH "VÉASE TAMBIÉN"
.BR isalpha "(3), " setlocale "(3), " locale (7)