I have been messing around with using private variables and defining them through a separate function. When I do it this way though, it outputs the incorrect answer. I wrote some code that just asks for the variables and doesn't make the variables private and get the correct answer.

Here is the code that produces the incorrect answer

Here is the code that produces the correct answer

Just for reference, the variables are:
Pipe diameter = 2.08
velocity = 10.01
Kinematic Viscosity = .00001217

and the Reynold's Number output should be 1.71 E6

I have been looking at this for quite some time and can't see where it would be doing the math wrong. Can someone look and help out a little bit. Just now diving into C++ and am trying to make my own projects to learn as I go.