i don't see the difference. there is input and output in writing a novel too if you want to trivialize it like that. and programs have multiple execution path

i don't see the difference. there is input and output in writing a novel too if you want to trivialize it like that. and programs have multiple execution paths, both potential and actual, and can have successive versions as well (e.g. CorelDraw 10.) choices made at some point can affect decisions later on. and it's likely actual humans will use your program