Boolean operator syntax error

[tdp]

Hello Guys,

 

I have been using the following without issue:-

if x= 49 || x=57 then a=26

But if I use the following, I get a Syntax error:-

if x= c-2 || x=c+2 then a=26

I guessing I'm missing something really obvious here, but what have I done wrong. I have checked out http://www.randomterrain.com/atari-2600-memories-batari-basic-commands.html#boolean, and from what I can see, what I'm doing is good. For what I'm trying to do, it is important that the x value is compared against the result of the c value.

 

The weird thing is that the following compiles without issue:-

if x=c+1 then a=14

Is the problem that I'm doing x=c-2 followed by the boolean or?

[Osgeld]

try

 

if x= (c-2) || x=(c+2) then a=26

 

Edit you need a space tween - and 2

Edited May 28, 2018 by Osgeld

[tdp]

Thanks for the response Osgeld. Spaces is not the issue:-

if x = c - 5 || x = c + 5 then a=28

The above still fails to compile. I also tried:-

if x = (c - 5) || x = (c + 5) then a = 28

But still no cigar. Any further ideas?

[+Lewis2907]

tdp,

 

I got this to compile:

 

if x= c-2 then a=26 else if x=c+2 then a=26

 

I'm not sure if this is what you are looking for, thanks.

[bogax]

This Works

  if x <> c - 2 && x <> c + 2 then skip

  a = 26

 

skip

This Works better

  if c - 2 <> x && c + 2 <> x then skip

  a = 26

 

skip

Edited May 30, 2018 by bogax

[tdp]

Thanks guys. Digging into the RT bBatari docs some more, I can see that OR (||) has more restrictions on it that AND (&&). Case in point:-

if player0x = c + 5 && player0y = d + 5 then a=30

The above compiles fine. Now, just swap the operator from AND to OR:-

if player0x = c + 5 || player0y = d + 5 then a=30

The above does not compile. Looks like there are stricter restrictions on OR, compared to AND. Still trying stuff.

Edited May 30, 2018 by tdp

[+Random Terrain]

Earlier versions of bB couldn't use math in if-thens, so we did the math in temporary variables and used those in the if-thens. I still do that to avoid any problems.

[tdp]

Hello Random - what do you mean by temporary variables? Will need to hit the docs again to learn more.

Edited May 30, 2018 by tdp

[+Random Terrain]

Hello Random - what do you mean by temporary variables?

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#temp_variables

 

Example:

---

   temp6 = c + 5 : temp5 = d + 5
   if player0x = temp6 || player0y = temp5 then a = 30

[tdp]

@RT - Awesome stuff. I will try this later.

 

Thank you so much!!