Ctype and Functions

[Sirrach]

How would you get a character input from user and then use that input to test it in one of the character handling libraries? Thanks for any help.

 

[DZH]

Here is code which checks if the character entered by a user is an alphabetic character:

#include <ctype.h>    /* isalpha() and friends */
#include <stdio.h>    /* printf() */

 ...
     int ch;

      ...
      ch = getchar();
      if (isalpha(ch)) {
          printf (&quot;Alphabetic!\n&quot;);
      } else {
          printf (&quot;Non-alphabetic\n&quot;);
      }
      ...

The function isalpha() and other character classification functions from ctype.h return a non-zero value if the condition being tested is true, and zero otherwise.

 

[rbobbitt]

You'll also want to cast the argument passed to any of the to* and is* functions in <ctype.h> to unsigned char.

Even though they all accept an int, the C standard requires that the argument be in the range of 0 to UCHAR_MAX or EOF for the behavior to be defined.
Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts