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How do I initiate a scanner?

Ok, I have that, but now I'd like to surround it by a try/catch phrase in case the user puts in a file that isn't recognized or can't be read.

I know that I have to exit the program and return a...

Hi.

I'm writing a program that will do different sort of things to matrices (add, subtract, multiply) from a file. I'd like to ask the user which file they would like read, and then read the file...