Why is the number not reversed?

Question

C++ / C#

Please tell me why the second part of the task is not executed? what am i doing wrong?
Task: Given three variables of real type A B C. If their values ​​are sorted in ascending or descending order, then double them. Otherwise, replace the value of each variable with the opposite, display the resulting values.
Here is what I have

Answer 1

change the value of each variable to the opposite

It's simple A = -A;, no conditions needed.
This A *= 2;is what you have written - this is squaring.

Answer 2

what is the "second part"?
and you also clearly have an error in line 13 - four brackets are missing.