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*                                                                       *    
*  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_charclass.c      */

/* This example uses the isalpha, isdigit, and isspace          */
/* functions to count the number of occurrences of letters,     */
/* digits, and white-space characters entered through the       */
/* standard input (stdin).                                      */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>

main()
{
    char c;
    int i = 0,
        j = 0,
        k = 0;

    while ((c = getchar()) != EOF) {
        if (isalpha(c))
            i++;
        if (isdigit(c))
            j++;
        if (isspace(c))
            k++;
    }

    printf("Number of letters: %d\n", i);
    printf("Number of digits:  %d\n", j);
    printf("Number of spaces:  %d\n", k);
}