Is it possible to create variables in a loop?

Question

C++ / C#

Hello! I ran into such a thing that when creating a simple calculator , I had to put all the code in a while loop . I don't know if it's normal to create variables inside a while loop ?

Answer 1

What do you mean by "create variables"? If you mean declaring variables, then this is not just a normal phenomenon, but a recommendation - if you need a variable only in a cycle (and it will not be visible outside the cycle, because the cycle will have its own scope), then it is much better, if you are in a loop and declare it.
The rule is very simple - keep variable declarations close to where they are used, or more precisely, keep variables in the most nested scope, as far as possible according to where they are used.