Getting Started

Question

Hi,

I am just getting started (absolute beginner) as I need to learn a language for a little private project of my own, not a student (far too old) help with assignment or anything like that. I have looked around at free books videos etc and its OK but the  one thing in common is that the materials tend to gloss over a lot and get you to copy code without really knowing whats going on, so you see the results of "your" work but still left confused.

I started a book C# Step by Step and it is explaining things quite nicely but there are still a few things that are not fully explained or glossed over. I don't really want to get well into the book with more and more questions going around in my head.  So I would just like to check my understanding of whats going on and clarify 1 point in particular.

Its a simple simple program and I have added comments under the first method so I think I understand the flow and whats going on..

The code is::

#region Using directives

using System;
using System.Collections.Generic;
using System.Text;

#endregion

namespace DailyRate
{
    class Program
    {
        static void Main(string[] args)
        {
            (new Program()).run();
        }

        public void run()
        {
            double dailyRate = readDouble("Enter your daily rate: ");
            // Declares int dailyRate
            // Assigns to METHOD readDouble ((which is text above)
            // On execution goes to readDouble Method

            int noOfdays = readInt("Enter the number of days: ");
            writeFee(calculateFee(dailyRate, noOfdays));     
        }

        private void writeFee(double p)
        {
            Console.WriteLine("The consultant's fee is {0}", p * 1.1);
        }

        private double calculateFee(double dailyRate, int noOfdays)
        {
            return dailyRate * noOfdays;
        }

        private int readInt(string p)
        {
            Console.Write(p);
            string line = Console.ReadLine();
            return int.Parse(line);
        }

        private double readDouble(string p)
       
        {
            Console.Write(p);
            // Writes readDouble  or p to Console
            // i.e Enter your daily rate
            string line = Console.ReadLine();
            // this reads response to question
            return double.Parse(line);
            // this parses from string to double
            // returns result to dailyRate and sets value
        }
    }
}
My query is around variable p
declared an int  double dailyRate = readDouble("Enter your daily rate: ");
Being a novice I thought this was set to enter etc
But looking at the Method is looks like the value it brackets is assigned p rather than the text, it is also the same for others and it also quotes string p in intellisense.
Is this the case?
Is this always the case if I name a method()
The book mentions variable p but doesn't explain where it is so its the only thing I can think of.

My apologies if this is too basic and I seem thick (which could be true) but  I just like to know what is really going on.

Thanks for reading it and if you have taken the time to respond.

No doubt the first of many.

sam