Why not use exceptions as regular flow of control?

Question

To avoid all standard-answers I could have Googled on, I will provide an example you all can attack at will.

C# and Java (and too many others) have with plenty of ty

Answer 1

Lets assume you have a method that does some calculations. There are many input parameters it has to validate, then to return a number greater then 0.

Using return values to signal validation error, it's simple: if method returned a number lesser then 0, an error occured. How to tell then which parameter didn't validate?

I remember from my C days a lot of functions returned error codes like this:

-1 - x lesser then MinX
-2 - x greater then MaxX
-3 - y lesser then MinY

etc.

Is it really less readable then throwing and catching an exception?