How do this program work?

Question

this question for know who which understending program work.

https://code.sololearn.com/c0j0q6F9nc6t/?ref=app

Answer 1

Simply, it compare values in variables and move the least one to val1, and max one to val3.

Answer 2

fix your spelling

Answer 3

As a personal exercise you can comment each line of code to describe what it does.
You can do it until you won't need it anymore.