How can i fix when a user Enter a string instant of Entering a number? Help me out!

Question

In this code i use only prompt to input from user i can use input box in HTML but this is the challenge.

This is my code.....

https://code.sololearn.com/WE6jNN7HNg95/?ref=app

Answer 1

Just parseInt() from the prompt and check it for NaN:
https://code.sololearn.com/WcrONiYM2QJK/#js