Value Types and Reference Types

[Ecal]

[XCODE]
using
System;
using
System.Collections.Generic;
using
System.Collections.ObjectModel;
using
System.Linq;
using
System.Text;
　
namespace
ValueAndReferenceTypes
{

class Program
{

static void Main(string[] args)
{
}

struct Point
{

//Fields of the structure.

public int X;

public int Y;

//Add 1 to the (X,Y) position.

public void Increment()
{
X++; Y++;
}

// Subtract 1 from the (X,Y) position.

public void Decrement()
{
X--; Y--;
}

//Display the current position.

public void Display()
{

Console.WriteLine("X = {0}, Y = {1}", X, Y);
}
}

struct Point2
{

//Fields of the structure.

public int X;

public int Y;

// A custom constructor.

public Point2(int XPos, int YPos)
{
X = XPos;
Y = YPos;
}

//Display the current position.

public void Display()
{

Console.WriteLine("X = {0}, Y = {1}", X, Y);
}
}

static void ValueTypeAssignment()
{

Console.WriteLine("Assignment value types \n");

Point p1 = new Point(10, 10);

Point p2 = p1;

//Print both points
p1.Display();
p2.Display();

//Change p1.X and print again. p2.X is not changed.
p1.X = 100;

Console.WriteLine("\n=> Changed p1.X\n");
p1.Display();
p2.Display();
}
}
}

[/XCODE]

Not sure what I am doing Wrong but on line 66 I have an error that comes up that says:

'ValueAndReferenceTypes.Program.Point' does not contain a constructor that takes 2 arguments

Is there something I am over looking other than I am not calling it method in my main?

 

[jmcilhinney]

Firstly, you have made your code harder to read. When you use xcode tags you must specify an option, i.e. how to format the code. On this forum, only c# is supported as an option. You then must paste plain text inside the tags.

As for the issue, it's spelled out in the error message. Can you see a constructor with two parameters in your Point type? I can see one in your Point2 type but that's a different type so it doesn't help.

 

[Ecal]

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
　
namespace ValueAndReferenceTypes
{

class Program​

{
​

static void Main(string[] args)​

{
​

}
​

struct Point​

{​

//Fields of the structure.​

public int X;​

public int Y;​

//Add 1 to the (X,Y) position.​

public void Increment()​

{
​

X++; Y++;
​

}
​

// Subtract 1 from the (X,Y) position.
public void Decrement()
{
​

X--; Y--;​

}

//Display the current position.

​

public void Display()​

{​

Console.WriteLine("X = {0}, Y = {1}", X, Y);​

}
​

}​

​

structPoint2​

{
​

//Fields of the structure.
public int X;
public int Y;

// A custom constructor.
public Point2(int XPos, int YPos)
{
​

X = XPos;​

Y = YPos;
​

}

//Display the current position.
public void Display()
{
​

Console.WriteLine("X = {0}, Y = {1}", X, Y);
​

}
​

}
​

static void ValueTypeAssignment()​

{
​

Console.WriteLine("Assignment value types \n");
Point p1 = new Point(10, 10);
Point p2 = p1;

//Print both points
p1.Display();
p2.Display();

//Change p1.X and print again. p2.X is not changed.
p1.X = 100;

Console.WriteLine("\n=> Changed p1.X\n");
p1.Display();
p2.Display();
​

}​

}
​

}

I hope this is more readable not sure How to use the C# Icon but I just pasted it in here again. Think I got it. The code was pointing to Point instead of Point2

Out Put console

Assignment value types
X = 10, Y = 10
X = 10, Y = 10
=> Changed p1.X
X = 100, Y = 10
X = 10, Y = 10