Discount on the total number of positive

Version 4 V4 Question
1

when in a template, add {DISCOUNT TOTAL} when in a template, add
a formula or is there a way to get him out positive?
thanks

2

Something like [=F(0-TN('{DISCOUNT TOTAL}'))] ?

3

thanks emre,
There are many settings that you do not know.
why this function takes away the negative?
I would like to know the formatting,
example, instead of 1.30 €, I want 1.3

4

We have some examples here on Expressions part.

5

in the guide can not figure out how to format the numbers
I would like to remove the trailing zero
example, instead of 1.30 €, I want 1.3

6

You can format it as

[=F(TN('{TICKET TOTAL}'),'0.##')]

That means two optional digits. You can read more about it here

http://msdn.microsoft.com/en-us/library/0c899ak8(v=vs.110).aspx