Error when using Constructor: super() is only valid inside?

Question

React

Guys, need help. I need to enter two numbers and they are summed up, for this I looked, I need to use the constructor, but for some reason it gives me an error, I don’t understand what’s wrong. Next, I want to complicate mathematical operations, for example, the sum of all the digits of the number that I enter, tell me where to read about it.

Here are the screenshots of the errors:
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Thank you in advance

Answer 1

You put the body of the class component into the shell of a functional component
Be careful with copy-paste and documentation.