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I realized that it works even without the nextLine(). So I believe it's all good now.

My failure: Used a number that is not a double.

What do you mean by input? If you mean code, that's exactly the one I'm using. Sorry if I misunderstood.

--- Update ---

I apologize - it was a failure at my end. Thank you for the nextLine()...

First, I typed fnum = myscanner.nextLine() under the first one (fnum = myscanner.nextDouble()) but it really sounded stupid because I already defined fnum as a double. So I did something crazy and...

I tried placing it under fnum = myscanner.nextDouble().

Can you show me where should I place the .nextLine() please?

Hello, I recently decided to use the skills I acquired so far to build a basic calculator (very basic). But for some reason I get this exception when I run the program.

Exception in thread "main"...