How to calculate the complexity in the code itself?

Question

C++ / C#

Is it possible after, for example, sorting, to make the complexity of the algorithm calculated and displayed on the screen?

Answer 1

You can count the number of certain operations and output it, for example.

Answer 2

You can make a "tree" of iterations and, based on the analysis of the nodes of this "tree", determine the complexity.

Answer 3

You can run the code on different inputs and see which function increases the calculation time