/ ************************************************************************
*
* Purpose: Program to demonstrate the following functions:
* isalpha, isdigit, isspace.
* The same principles apply to isalnum, iscntrl, isgraph,
* islower, isprint, ispunct, isupper, isxdigit
*
* Author: M. J. Leslie
* Date: 09-Mar-94
*
************************************************************************/
#include <stdio.h> /* printf */
#include <ctype.h> /* isalpha isdigit isspace etc */
#define FALSE 0
#define TRUE 1
/* function declarations */
int char_type(char);
main()
{
char ch;
/* get a character from the keyboard */
printf(" Please enter a charcater => ");
ch = getc(stdin);
char_type(ch); /* Figure out the character type */
}
/****************************************************************
decide the character type.
*****************************************************************/
int char_type(char ch)
{
/* returns non zero if A-Z or a-z */
if ( isalpha(ch) != FALSE)
printf("%c is an Alpha character.\n",ch);
/* returns non zero if 0-9 */
if ( isdigit(ch) != FALSE)
printf("%c is a numeric character.\n",ch);
/* returns non zero if a space, CR, Tab, NL FF */
if ( isspace(ch) != FALSE)
printf("%c is white space\n", ch);
}
.