" ← " button : I go back to the previous calculation results
" → " button : To proceed to the calculation result after one

You can go back and forth five times of calculation results in the above buttons .
Returning to the past of the calculation results , you can also further continue another calculation .

It was created in cocos2dx!

source code at github also we have published .
https://github.com/highcom/test-program.git