Adition of two strings... How? (cast)?

[Leo75]

Here we go... i know, that i have to CAST them... but how?
The idea is to add (adition) two strings...
a:String = "20";
b:String = "10";

c:String = a+b;

I get c=2010 and not 30 as i expected...
i guess i have to cast, but how?

Thanks.
Leo.

[Robb@exo]

You're trying to add 2 strings together that why 20 + 10 = 2010. You first need to convert the strings into numbers and then add them together to achieve a proper mathematical addition. Try this,

var c:String = String(Number(a)+Number(b));