setting one variable to match another

[Smooth23]

How do I set one variable to match another, without changing the first?

Example, the user inputs 2, and I want to use that input to set another variable to match
so I want to do input = newnumber

but im going to be looping this to do calculations, using the original input, but the newnumber will change repeatedly. I hope my problem makes sense.
I dont want my input number to match the newnumber after every loop.
Thanks

[kbw]

I hope my problem makes sense.

Not really.

[Disch]

How do I set one variable to match another, without changing the first?

C++ 101:

var_a = var_b;

This changes var_a so that is matches var_b, and does not change var_b

[Smooth23]

Thank you Disch, that is what I thought, but I was trying to overthink the whole thing and wanted to make sure.