Check out my calculator app Here
It seems to work fine, but when i tried it on mobile only the “=” responded.
Feedbacks please
The ** operator doesn’t seem to work.
Maybe you can make the height of the fields constant, regardless of whether there’s a number there or not.
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Simeon, the error you pointed out in my calculator (15000 + 020 gives 15016)
is present in yours too. 
- Bruce
I just noticed! Were you able to fix yours? thanks!
I think so. Check it out and let me know if you find anything:
Yeah its working. Fixed mine too
Yes, it works well now!