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# isalpha

Character Classification and Conversion Functions

Checks if a character is a letter in the alphabet.

    int isalpha( int c);

c | The character to check.

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.

Copy code

        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

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