I would like to create an math app so that you stepwise add/subtract a number in two numberboxes with two different initial numbers.

like in patch below (which not working, just for explaining)

I would like to create an math app so that you stepwise add/subtract a number in two numberboxes with two different initial numbers. 

like in patch below (which not working, just for explaining)


stepwise-addingsubtracting-numbers

I'm not exactly sure what you're asking, but the [accum] object is pretty flexible for this sort of thing.

Say I got two numbers in two different number boxes, say:

Then I want to increase or decrease these stepwise so like [+ 1] both increase 1 and [- 1] both decrease 1.

Then I want to increase  or decrease these stepwise so like [+ 1] both increase 1 and [- 1] both decrease 1. 

Yeah. Chris is right. The accum object will be your friend.

In another thread, I was accused of some sort of disloyalty to the IncDec object (which I wrote.) Here's a very IncDec-centric solution to your problem:

send the current state, -1, and 1 to [accum].

stepwise adding/subtracting numbers