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Puzzle #9: Calculator
Puzzle #9: Calculator
Bonus Challenges
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Bonus Challenges

If you got this far and want to keep going, try including some of this additional functionality that most calculators support, in order of difficulty:
Add C and AC buttons.
C should clear the current value and AC should reset the entire calculation
Operations on the result of a calculation.
For example, entering “1+4=x2=” should result in 10.
Changing the operator, if you pressed the wrong one by mistake.
For example, entering “5-+2=” should result in 7.
Chaining operations, so you don’t need to press = every time.
For example, entering “1+2x4=/6+2=” should result in 4
Support operating on a number with itself, so you don’t have to retype it.
For example, entering “1+=” should result in 2
Support performing the same operation multiple times.
For example, entering “1+3====” should result in 13

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