First commit

03 - Classes 101/A Simple Class/Build1.bat

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+csc File_1.cs

03 - Classes 101/A Simple Class/Build2.bat

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+csc File_2.cs

03 - Classes 101/A Simple Class/File_1.cs

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+// 05 - Classes 101\A Simple Class
+// copyright 2000 Eric Gunnerson
+class VerySimple
+{
+    int    simpleValue = 0;
+}
+class Test
+{
+    public static void Main()
+    {
+        VerySimple vs = new VerySimple();
+    }
+}

03 - Classes 101/A Simple Class/File_2.cs

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+// 05 - Classes 101\A Simple Class
+// copyright 2000 Eric Gunnerson
+using System;
+class Point
+{
+    // constructor
+    public Point(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+
+    // member fields
+    public int x;
+    public int y;
+}
+
+class Test
+{
+    public static void Main()
+    {
+        Point myPoint = new Point(10, 15);
+        Console.WriteLine("myPoint.x {0}", myPoint.x);
+        Console.WriteLine("myPoint.y {0}", myPoint.y);
+    }
+}

03 - Classes 101/Member Functions/Build1.bat

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+csc File_1.cs

03 - Classes 101/Member Functions/File_1.cs

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+// 05 - Classes 101\Member Functions
+// copyright 2000 Eric Gunnerson
+using System;
+class Point
+{
+    public Point(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+
+    // accessor functions
+public int GetX() {return(x);}
+public int GetY() {return(y);}
+
+    // variables now private
+    int x;
+    int y;
+}
+
+class Test
+{
+    public static void Main()
+    {
+        Point myPoint = new Point(10, 15);
+        Console.WriteLine("myPoint.X {0}", myPoint.GetX());
+        Console.WriteLine("myPoint.Y {0}", myPoint.GetY());
+    }
+}

03 - Classes 101/Overloading/Build1.bat

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+csc File_1.cs

03 - Classes 101/Overloading/File_1.cs

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+// 05 - Classes 101\Overloading
+// copyright 2000 Eric Gunnerson
+class Point
+{
+    // create a new point from x and y values
+    public Point(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+    // create a point from an existing point
+    public Point(Point p)
+    {
+        this.x = p.x;
+        this.y = p.y;
+    }
+
+    int x;
+    int y;
+}
+
+class Test
+{
+    public static void Main()
+    {
+        Point myPoint = new Point(10, 15);
+        Point mySecondPoint = new Point(myPoint);
+    }
+}

03 - Classes 101/Ref and Out Parameters/Build1.bat

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+csc File_1.cs

03 - Classes 101/Ref and Out Parameters/Build2.bat

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+csc File_2.cs

03 - Classes 101/Ref and Out Parameters/Build3.bat

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+csc File_3.cs

03 - Classes 101/Ref and Out Parameters/File_1.cs

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+// 05 - Classes 101\Ref and Out Parameters
+// copyright 2000 Eric Gunnerson
+// error
+using System;
+class Point
+{
+    public Point(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+    // get both values in one function call
+    public void GetPoint(ref int x, ref int y)
+    {
+        x = this.x;
+        y = this.y;
+    }
+
+    int x;
+    int y;
+}
+
+class Test
+{
+    public static void Main()
+    {
+        Point myPoint = new Point(10, 15);
+        int x;
+        int y;
+
+        // illegal 
+        myPoint.GetPoint(ref x, ref y);
+        Console.WriteLine("myPoint({0}, {1})", x, y);
+    }
+}

03 - Classes 101/Ref and Out Parameters/File_2.cs

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+// 05 - Classes 101\Ref and Out Parameters
+// copyright 2000 Eric Gunnerson
+using System;
+class Point
+{
+    public Point(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+
+    public void GetPoint(ref int x, ref int y)
+    {
+        x = this.x;
+        y = this.y;
+    }
+
+    int x;
+    int y;
+}
+
+class Test
+{
+    public static void Main()
+    {
+        Point myPoint = new Point(10, 15);
+        int x = 0;
+        int y = 0;
+
+        myPoint.GetPoint(ref x, ref y);
+        Console.WriteLine("myPoint({0}, {1})", x, y);
+    }
+}

03 - Classes 101/Ref and Out Parameters/File_3.cs

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+// 05 - Classes 101\Ref and Out Parameters
+// copyright 2000 Eric Gunnerson
+using System;
+class Point
+{
+    public Point(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+
+    public void GetPoint(out int x, out int y)
+    {
+        x = this.x;
+        y = this.y;
+    }
+
+    int x;
+    int y;
+}
+
+class Test
+{
+    public static void Main()
+    {
+        Point myPoint = new Point(10, 15);
+        int x;
+        int y;
+
+        myPoint.GetPoint(out x, out y);
+        Console.WriteLine("myPoint({0}, {1})", x, y);
+    }
+}

04 - Base Classes and Inheritance/Abstract Classes/Build1.bat

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+csc File_1.cs

04 - Base Classes and Inheritance/Abstract Classes/Build2.bat

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+csc File_2.cs

04 - Base Classes and Inheritance/Abstract Classes/File_1.cs

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+// 06 - Base Classes and Inheritance\Abstract Classes
+// copyright 2000 Eric Gunnerson
+using System;
+class Engineer
+{
+    public Engineer(string name, float billingRate)
+    {
+        this.name = name;
+        this.billingRate = billingRate;
+    }
+
+    virtual public float CalculateCharge(float hours)
+    {
+        return(hours * billingRate);
+    }
+
+    virtual public string TypeName()
+    {
+        return("Engineer");
+    }
+
+    private string name;
+    protected float billingRate;
+}
+class ChemicalEngineer: Engineer
+{
+    public ChemicalEngineer(string name, float billingRate) :
+    base(name, billingRate)
+    {
+    }
+
+    // overrides mistakenly omitted
+}
+class Test
+{
+    public static void Main()
+    {
+        Engineer[]    earray = new Engineer[2];
+        earray[0] = new Engineer("George", 15.50F);
+        earray[1] = new ChemicalEngineer("Dr. Curie", 45.50F);
+
+        Console.WriteLine("{0} charge = {1}",
+        earray[0].TypeName(),
+        earray[0].CalculateCharge(2F));
+        Console.WriteLine("{0} charge = {1}",
+        earray[1].TypeName(),
+        earray[1].CalculateCharge(0.75F));
+    }
+}

04 - Base Classes and Inheritance/Abstract Classes/File_2.cs

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+// 06 - Base Classes and Inheritance\Abstract Classes
+// copyright 2000 Eric Gunnerson
+using System;
+abstract class Engineer
+{
+    public Engineer(string name, float billingRate)
+    {
+        this.name = name;
+        this.billingRate = billingRate;
+    }
+
+    virtual public float CalculateCharge(float hours)
+    {
+        return(hours * billingRate);
+    }
+
+    abstract public string TypeName();
+
+    private string name;
+    protected float billingRate;
+}
+
+class CivilEngineer: Engineer
+{
+    public CivilEngineer(string name, float billingRate) :
+    base(name, billingRate)
+    {
+    }
+
+    override public float CalculateCharge(float hours)
+    {
+        if (hours < 1.0F)
+        hours = 1.0F;        // minimum charge.
+        return(hours * billingRate);
+    }
+
+    // This override is required, or an error is generated.
+    override public string TypeName()
+    {
+        return("Civil Engineer");
+    }
+}
+
+class ChemicalEngineer: Engineer
+{
+    public ChemicalEngineer(string name, float billingRate) :
+    base(name, billingRate)
+    {
+    }
+
+    override public string TypeName()
+    {
+        return("Chemical Engineer");
+    }
+}
+class Test
+{
+    public static void Main()
+    {
+        Engineer[]    earray = new Engineer[2];
+        earray[0] = new CivilEngineer("Sir John", 40.0F);
+        earray[1] = new ChemicalEngineer("Dr. Curie", 45.0F);
+
+        Console.WriteLine("{0} charge = {1}",
+        earray[0].TypeName(),
+        earray[0].CalculateCharge(2F));
+        Console.WriteLine("{0} charge = {1}",
+        earray[1].TypeName(),
+        earray[1].CalculateCharge(0.75F));
+    }
+}

04 - Base Classes and Inheritance/Arrays of Engineers/Build1.bat

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+csc File_1.cs

04 - Base Classes and Inheritance/Arrays of Engineers/Build3.bat

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+csc File_3.cs