How do i set the % mode switch in DDMathParser

Question

I am trying to use the DDMathParser in my application, and am having difficulty in getting it to work with % symbol as percent, instead of modulo.

The wiki advises the following -

The % sign is usually interpreted as the modulo operator. However, DDMathParser.h defines a compile-time switch (DD_INTERPRET_PERCENT_SIGN_AS_MOD) that allows you to change it to be interpreted as a percentageI

I added this define in the DDMathParser.h , but it hasn't worked. expressions are still calculated as modulo, and this is not the result i would like.

Does anybody have any experience of this, and know specifically how to set this up?

Please advise

So what did you go with as an alternative, or was your project abandoned to forever collect meta-dust? ;-) — App Dev Guy, Jul 02 '15 at 04:49
i just haven't implemented the % function i wanted to use - ddmathparser still used for other functions, just can't get my head around the % switching yet - when i finally get it sorted, i'll post the solution here if i can — superllanboy, Jul 02 '15 at 09:10

score 1 · Answer 1 · answered Sep 13 '15 at 13:23

1

You can use the following

[[DDMathOperatorSet defaultOperatorSet] setInterpretsPercentSignAsModulo:NO];

answered Sep 13 '15 at 13:23

R. Heper

54
2

Thank man, I so many times changed it in the library to make it works. :) You helped a lot :) – invoodoo Oct 19 '15 at 01:54
@AntonAnisimov How it is behaving? For my latest code of objc Its not working. – hardik hadwani Dec 28 '15 at 12:40

score 0 · Answer 2 · answered May 06 '16 at 22:24

I've been able to resolve this. First of all, you have to add this to your code, as mentioned before:

[[DDMathOperatorSet defaultOperatorSet] setInterpretsPercentSignAsModulo:NO];

Then however, you also need to fix a bug in the DDMathParser source code. I've been using the latest available ObjectiveC version of the source, dated Nov 10, 2015, from here: https://github.com/davedelong/DDMathParser/releases/tag/objc , and the bug is in the DDMathOperator.m

Where it says:

return OPERATOR(DDMathOperatorPercent, @[@"%"], BINARY, 0, LEFT);

change it to:

return OPERATOR(DDMathOperatorPercent, @[@"%"], UNARY, 0, LEFT);

That's it - percents calculate fine afterward.

How do i set the % mode switch in DDMathParser

2 Answers2