isalpha

Checks if a character is a letter in the alphabet.

int isalpha( int c); 

The function isalpha checks to see if a character is within the ranges A - Z or a - z.

Return Values

This function returns a non-zero value (true) if the character is a letter, zero (false) if it is not.

Example

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