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# if

An control flow logic function used to execute an instruction or a block of instructions only if a condition is fulfilled. If the condition in the parentheses following the if is true, the instructions are executed.

    if( expression ) statement1;

    or

    if( expression ) statement1;
    elsestatement2 ;

## Example

The following example checks whether characters with the ascii values 107 and 22 are alpha-numeric.

The if statement tests whether isalpha returns a non-zero value. If it does, the value is alpha-numeric. If not, the else clause prints a suitable message.

        if (isalpha(107))
            lr_output_message ("The value 107 is %c", 107);
        else
            lr_output_message ("The value 107 is non-alphabetic");

        if (isalpha(22))
            lr_output_message ("The value 22 is %c", 22);
        else
            lr_output_message ("The value 22 is non-alphabetic");

    Example: Output:
    Action.c(4): The value 107 is k
    Action.c(11): The value 22 is non-alphabetic

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