I'm in an intro to programming class and while I'm able to follow along with basic problems, I totally don't get some of the problems that get assigned as homework. I've spent an inordinate amount of time trying to just figure out how to started on what I've come to realize (after looking at literally every google search possible related to this) is a very simple problem. I just don't know how to get the ball rolling here. I basically just need to make a program that takes a cipher inputted by the user and moves all the characters in that cipher "up" 3 characters [i.e. D (68 as I understand it is interpreted in computer language) goes to A (65)]. I realize it's supposedly really simple but I have literally no idea how to do it.
Can someone give me like a pseudocode or something so I can see the basic framework? The full code would be great as well but I really want to wrap my head around this stuff and I think seeing it in a language I can actually understand might do a lot to help. Any and all assistance would be extremely appreciated.