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

Want to print your doc?
This is not the way.

Try clicking the ⋯ next to your doc name or using a keyboard shortcut (

CtrlP

) instead.