How to get the run time of codes?

[Robin7878]

I want to how to get the run time of codes.

For example , 

       for(i = 0; i < 10; i++) a = i;

[RobertoBozzolo]

Are you interested in knowing the execution time of a section of code? Would a simple difference between two Timer () values be enough?

double  t0, exeT;

tini = Timer ();
// Code to test
exeT = Timer () - tini;

If not, can you clarify better your question?