Re: Advantages of RPG

Wilt, Charles wrote:

While I agree with Joe that RPG's SELECT op-code is nice to have, it should be pointed out that other
languages ( or RPG itself) simply use IF - ELSIF - for this type of logic.

// Opcodes 01 and 02 don't need authorization
If OPCODE = '01';
DoOpcode1();
ElseIf OPCODE = '02';
DoOpcode1();

// Opcode 10 needs authorization
ElseIf not Authorized();
SendError('Not Authorized');
ElseIf OPCODE = '10';
DoOpcode10();

// Bad opcode
else;
SendError('Bad Opcode');

Endif;

Technically true. But I hate using ELSEIF as a state controller, especially since it's NOT supported on many languages. C and Java don't support it, although one of the subtleties of the Java syntax allows "else if" to technically work just like "elseif".

In any case (no pun intended), I prefer SELECT/WHEN over ELSEIF for controller logic.

Joe