[-][One byte adder
The two values are next to each other and the cursor points to the right one.
The "return value" is stored in the left one.
Author: Matt Traudt
This work is released to the public domain "under" the unlicense. See LICENSE.]

Increment two cells to value of 4 and 3
++++
>+++

The actual adding: while the second cell is nonzero increment the first one and
decrement the second
[<+>-]

Output first cell
<.
