What's the problem on line 18

Question

https://code.sololearn.com/cbcw3OO1SNH0/?ref=app

Answer 1

Nothing. You just can’t leave the input field empty. You could use try and catch statements to check if the user left it empty or not.

You must make the x variable public and declare it outside changeFromCapitals() function. Else you will get error on line 46

Answer 2

shouldn't not be in front of x?