Harlowe does math wrong

twitwi

Take the following math expression:

3 * 3 + 3

You would multiply 3 by 3 first and then add the 3, giving 12.

In Harlowe

(set: $a = 3 * 3 + 3)
(set: $b = 3 + 3 * 3)
$a
$b

Will show as

18
12

Which looks like Harlowe solves math expressions from right to left.

In case you were curious SugerCube and Snowman both works fine with this example:
Snowman

<%
$a = 3 * 3 + 3; print($a + "<br>");
$b = 3 + 3 * 3; print($b);
%> 

12
12

Sugercube

<<set $a to 3 * 3 + 3>>
<<set $b to 3 + 3 * 3>>
$a
$b

12
12

Versions tested:
Harlowe 1.0.1
Snowman 1.0
SugarCube 1.0.23

Hanon Ondricek

Isn't this why braces are always recommended by default in equations?

Sharpe

This is a recognized issue and changed in the 1.1 beta.

twitwi

Ah I see, so all will be good and well.

AvaJarvis

Hanon Ondricek wrote: »

Isn't this why braces are always recommended by default in equations?

Operator precedence is a standard feature in every language. Why would you want to force parenthesis around every single operation when it's not necessary...?

Hanon Ondricek

AvaJarvis wrote: »

Hanon Ondricek wrote: »

Isn't this why braces are always recommended by default in equations?

Operator precedence is a standard feature in every language. Why would you want to force parenthesis around every single operation when it's not necessary...?

I was always taught never to leave math open for interpretation.

greyelf

I think that operator precedence is like default values for variables, it should not be left up to the language to hopefully get right. I was also taught that if you want to make sure something is definitely correct then you do it yourself. lol