[TYPO3] Math in TypoScript

[Bertalan Fodor]

I have read this place more times. I still don't understand how this 
relates to my problem. It states the following:

"Sometimes a datatype is set to "something +calc". "+calc" indicates 
that the value is calculated with "+-/*". Be aware that the operators 
has no "weight". The calculation is done in the order of the operators."

So I have a constant:

x = 15

I want to have an other constant with the value x+3

How does "sometimes" "datatype is set" "+calc" come to here?

Where is the datatype? How is it set? Should I write +calc somewhere?

Thanks,

Bert


Dmitry Dulepov i'rta:
> Bertalan Fodor wrote:
>> Note I'm trying to define constants calculated from each other.
>>
>> Do you know that there is information about what I need in TSRef, or 
>> do you only hope so? I have searched in TSRef for the word "calcul", 
>> and have read everything. So did I try setting x2 = 13 + 5, but didn't 
>> work.
> 
> http://typo3.org/documentation/document-library/references/doc_core_tsref/4.0.0/view/3/1/#id2796759 
> 
>