区分运算符和操作数

Question

I have a few questions regarding operators and operands. Take a look at these code samples:

Random r = new Random();
foreach(List<Point3d> individual in sG)
{
    index1 = r.Next(0, individual.Count);
    distance = actual.DistanceTo(next);
}

I know that these are the operators:

foreach() -- () -- ; -- = -- . -- , -- new

And I know that these are operands:

r -- individual -- sG -- index1 -- distance -- actual -- next -- 0

However what is with:

List<Point3d> -- in -- Next -- individual.Count -- DistanceTo -- Random

I'm guessing that List<Point3d> should be an operand and DistanceTo an operator but not sure at all.

For your information, I'm trying to calculate the Halstead Metrics for my genetic algorithm.

Here are some links where I got the information. Maybe it will be useful for others in search like myself. Measurement of Halstead Metrics ; Halstead metrics: Example ; Halstead Metrics: Example in German

Answer 1

List<> It's a Generic Class collection. What it stand for is that it's a list of Point3d which is another class.

in : it's a reserved word which works with the foreach statement. It means iterate for each element IN sG (which is a variable with lots of List and put the current element in the "individual" variable.

.DistanceTo, .Next, .Count, .Random, etc are methods and properties of each class.

I recomend you to read something about Object Oriented Programming before continue with that algorigthm...

Answer 2

in - is operator
Random , List<Point3d> - are Types
.Next() , .DistanceTo() - are functions
individual.Count - is property

More about these all you can read Here