How to fix this code?

Question

My code is showing an error of a variable being not identified.
I have an input box in html and I used getElementById() to get that element in a variable h1 and perform various operations on its value but it is showing that h1 is not defined.
Why?
I can't fix it even I tried my best.
Please somebody tell what is wrong in my code.
This is my code
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https://code.sololearn.com/Wj0etkhlq2LI/?ref=app

Answer 1

variables declared with `var` have function level scope. If you define variable within function it's local to that function and can't be accessed outside.

Now try to think how can you solve this.