using System;

public class Program  //0)  - remove static

{

    public void Main()  

    {

        //8)  - instantiating new instance of object

        Dog dog1 = new Dog(3, "Old Yeller", new DateTime(2016, 3, 6), false);       

        //9)  - logging to console

        Console.WriteLine("Name: " + dog1._name);

        Console.WriteLine("Age: " + dog1._age);

        Console.WriteLine("Dog Age: " + dog1._dogYrsAge);

        Console.WriteLine("First Letter of Name: " + dog1._firstLetter);

        Console.WriteLine("Is house trained?: " + dog1._houseTrained);

    }

}

​

public class Dog //1)  - create new class, show where in structure

{   

    //2)  - field variable declarations and types, pulbic

    public int _age = 5;

    public double _dogYrsAge = 30;

    public string _name = "Rover";

    public char _firstLetter = 'R'; 

    public DateTime _birthday = new DateTime(2015, 6, 12);

    public bool _houseTrained = true;   

​

    //3)  - constructor

    public Dog(int age, string name, DateTime birthday, bool houseTrained)  

    {       

        //4)  - assigning values to fields

        _age = age;         

        _name = name;

        _birthday = birthday;

        _houseTrained = houseTrained;

        //5)  - type casting

        double dblAge = age;  // can implicitly convert from lower detail to higher

        int intAge = (int)dblAge;  // need explicit conversion from higher to lower

        double dblName = double.Parse(_name);  // can parse from non-numeric to numeric and so on, but could fail

        //6)  - basic math stuff

        _dogYrsAge = _age * 7;      

        //7)  - basic text string stuff

        _firstLetter = char.Parse(_name.Substring(0, 1));

    }

}