Example: isalpha

The following example tests if the characters with the ASCII values 107 and 22 are letters.

    if (isalpha(107))
         lr_output_message ("The value 107 is %c", 107);
     else
         lr_output_message ("The value 107 is not alphabetic");
     

    if (isalpha(22))
         lr_output_message ("The value 22 is %c", 22);
     else
         lr_output_message ("The value 22 is not alphabetic");

Example: Output: 
Action.c(4): The value 107 is k
Action.c(11): The value 22 is not alphabetic