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What I do when I'm learning programming languages (I never stop) is I get Program5 working first and then copy it to Porgram5UsingCharAt and just change the little bit that makes it different. That...

Good! Now do it newbie's way in post #12!

You're absolutely right ... if xdrechsler's professor has asked for a calculator program to add one-digit numbers. That's another thing xdrechsler could ask!

Show us what you tried. A hint to get you going with Scanner without using java.util.regex.Pattern is to delimit your input. Put a space between each of your inputs like this: '3 + 5'. Then the...

Maybe, I think a lot of other forumers are more familiar with it than I am. Your first step is to read the API documentation for it to work out if it's right for your problem, what methods might work...

Maybe you want java.lang.Scanner - do you mean you type at the command prompt '3+5' all at once and your program reads the 3, then the +, then the 5?