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How to "throw an exception?"

 
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Hello, I wrote this code that takes values as input from a user until a negative number is entered, and then prints the average of those values, not including the negative number.
I need to figure out how to not print an average if the first number a user inputs is negative. I think I should "throw an exception," but I'm not really sure how to go about that.
Thanks!

 
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Not really sure? Then since you want to know about exceptions, your google keywords should be "java exception tutorial".

The first link you get back should be Oracle's tutorial (have a look at the URL to make sure). Read it: Lesson: Exceptions.
 
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