Fruitful method

1.

Dig out the old multadd project and make sure you can still compile and run it.

2.

Transform multadd into a fruitful method, so that instead of printing a result, it returns it.

3.

Everywhere in the program that multadd gets invoked, change the invocation so that it stores the result in a variable and/or prints the result.

4.

Transform yikes in the same way.