The required number

This was easy for me!

Just as a refresher: Does the value of the variable change based on the last line of code defining the value of the variable?

Error: My favorite number is five. Cannot complete task 😐.

Fun one,it's an interesting way to get used to interactions between lines of code.

Only the lines with "2" in them should be comment out.

Again, I managed it, because I used an online java compiler and randomly comment and uncomment the lines. Through randomly commenting and uncommenting I got the solution, but in all seriousness it is just waste of my time because a) I don't know what I am doing, b) there is no explanation how someone supposed to calculate or find it out on her/his own , c) I doubt this is helping me to understand class and objects.

I really hate this sort of tasks and I have doubt it is helping with learning Java.

So how do you solve this problem not using trial and error??

If the print method is calling the y variable shouldn't I automatically by deduction comment out any x variable?

Please advise in the print method or main method is the command given to add, subtract or multiply these x and y variables?