ELSEIF (Else If)

The ELSEIF operation is the combination of an ELSE operation and an IF operation. It avoids the need for an additional level of nesting.

The IF operation code allows a series of operation codes to be processed if a condition is met. Its function is similar to that of the IFxx operation code. It differs in that the logical condition is expressed by an indicator valued expression (indicator-expression). The operations controlled by the ELSEIF operation are performed when the expression in the indicator-expression operand is true (and the expression for the previous IF or ELSEIF statement was false).

For information on how operation extenders M and R are used, see Precision Rules for Numeric Operations.

For more information, see Structured Programming Operations.

 *..1....+....2....+....3....+....4....+....5....+....6....+....7...+....
 /free

    IF keyPressed = HELPKEY;
       displayHelp();
    ELSEIF keyPressed = EXITKEY;
       return;
    ELSEIF keyPressed = ROLLUP OR keyPressed = ROLLDOWN;
       scroll (keyPressed);
    ELSE;
       signalError ('Key not defined');
    ENDIF;

 /end-free