/************************************************************************
*                                                                       *    
*  Copyright Digital Equipment Corporation 1998. All rights reserved.   *
*                                                                       *    
*  Restricted Rights: Use, duplication, or disclosure by the U.S.       *    
*  Government is subject to restrictions as set forth in subparagraph   *    
*  (c) (1) (ii) of DFARS 252.227-7013, or in FAR 52.227-19, or in FAR   *    
*  52.227-14 Alt. III, as applicable.                                   *    
*                                                                       *    
*  This software is proprietary to and embodies the confidential        *    
*  technology of Digital Equipment Corporation. Possession, use, or     *    
*  copying of this software and media is authorized only pursuant to a  *    
*  valid written license from Digital or an authorized sublicensor.     *    
*                                                                       *    
************************************************************************/

/*      chap_3_conv_upperlower.c                                */

/* This program uses the functions toupper and tolower to       */
/* convert uppercase to lowercase and lowercase to uppercase    */
/* using input from the standard input (stdin).                 */

#include <ctype.h>
#include <stdio.h>      /*  To use EOF identifier */
#include <stdlib.h>

main()
{
    char c,
         ch;

    while ((c = getchar()) != EOF) {
        if (c >= 'A' && c <= 'Z')
            ch = tolower(c);
        else
            ch = toupper(c);
        putchar(ch);
    }
}