JS prompt - calculator (калькулятор)

Question

Help me, please. How to do in the calculator if you have not entered a number, then offer to enter again until you enter a number. And that would not count either 0 or nan.
Помогите мне, пожалуйста. Как в калькуляторе сделать если ввели не цифру, то предлагать еще раз ввести, пока не введет цифру. И что бы не считал или 0 или nan.

Answer 1

Ok, here's my solution, I'm using the do...while statement:
https://code.sololearn.com/W45ToHTR466g/?ref=app

Answer 2

Марина Гординская Try do{...}while(!val)

Answer 3

I can't open the code, please insert it clicking the insert button.

Answer 4

https://code.sololearn.com/WwPSIPERD38j

Answer 5

Thank you, this is what I need. What can you do with the cancel function? If you press it, it counts 0

Answer 6

Thanks, I'll try