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:
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
Bonus Challenges