if and if

[Samuele]

Hi, how can i write a conditional

Code: Select all

If something and if somethingElse then DoSomething 

?
Thanks!

[Klaus]

Just leave out one IF:

Code: Select all

...
if thisandthat AND thatandthis then
...

[dunbarx]

Samuele.

What Klaus said.

If you are just learning about this, experiment also with the "switch" structure, which oftentimes is easier to manage and read than complex "if/then" structures:

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switch
  case thisandthat
  case thatandthis
    doSomething
    break
  case whatever
    doSomethingElse
  break  
end switch

Craig

[dunbarx]

Going back to the "if" method, you have to understand how LiveCode works.

The statement that Klaus mentioned is really this:

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if (thisandthat AND thatandthis) then

You can see that there is only a single "if", as there must be, and that the more "complicated" portion in parentheses is evaluated independently. If that evaluation returns "true", then the "if" will fire.

Craig

[richmond62]

Not a bad idea to learn a bit of basic logic and the
satisfaction of truth conditions.

[Klaus]

Going back to the "if" method, you have to understand how LiveCode works.

The statement that Klaus mentioned is really this:

Code: Select all

if (thisandthat AND thatandthis) then

You cans that there is only a single "if", as there must be, and that the more "complicated" portion in parentheses is evaluated independently. If that evaluation returns "true", then the "if" will fire.

Craig

Actually I really meant:

Code: Select all

if (thisandthat) AND (thatandthis) then

[Samuele]

Thanks, the brackets are necessary?

[Klaus]

No, but they make it easier to read for the developer and also LC!

[dunbarx]

Richmond.

Not a bad idea to learn a bit of basic logic and the
satisfaction of truth conditions.

Always, I suppose, but I will bet the issue here is LC syntax, not knowledge of how the world works.

Craig

[richmond62]

Ha, ha, ha . . . all one has to do is look at Russia to see that basic logic has fuzz to do with how the world works.

But computers and computer programming are not the world.