Simple C# Console Programs

Learn C# with Examples and Exercises

Question 1
Create class Rectangle with instance data and write methods to input, calculate area and print the area.

 
Answer

using System;
class Rectangle
{
	double length;
	double width;
	double area;
	public void setData()
	{
		Console.Write("Entre value for length  ");
		length = Convert.ToDouble(Console.ReadLine());
		Console.Write("Entre value for Width  ");
		width = Convert.ToDouble(Console.ReadLine());         

	}
	public void calArea()
	{
		area = length * width;
	}
	public void displayData()
	{
		Console.WriteLine("Lenght={0}", length);
		Console.WriteLine("Width={0}", width);
		Console.WriteLine("Area={0}", area);
	}
	public static void Main(string[] args)
	{
		Rectangle r1=new Rectangle();
		r1.setData();
		r1.calArea();
		r1.displayData();
	}
}

Note: 
1) Save above program as Rectangle.cs 
2) Complie using csc Rectangle.cs
3) Run the Executable by double click

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Question 2
Write any c# class with all type of constructor

 
Answer

using System;
class NewStudent
{
	string name = "Jhon";
	int age = 30;
	// Default Constructor
	public NewStudent()      
	{
		name = "White";
		age = 45;
		Console.WriteLine("Name={0}", name);
		Console.WriteLine("Age={0}" , age);
	}
	// Parametriazed Constructor 
	public NewStudent(string x, int y)  
	{
		name = x;
		age = y;
		Console.WriteLine("Name={0}", name);
		Console.WriteLine("Age={0}" , age);
	}
	// Copy Constructor
	public NewStudent(NewStudent S)      
	{
		name = S.name;
		age = S.age;
		Console.WriteLine("Name={0}", name);
		Console.WriteLine("Age={0}" , age);
	}
	// Private Constructor
	private NewStudent(string a)      
	{
		name = a;
		Console.WriteLine("Name={0}", name);
	}

	public static void Main(string[] args)
	{
		NewStudent s1=new NewStudent("Ganesh",40);
		NewStudent s2=new NewStudent();
		
	}
}

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Question 3
Write any class as parent , and write a child class by using parent class.

Answer

using System;
class Father
{
	public string firstname = "White";
	protected string bank = "Commercial";
	internal string address = "16 Old Road";
	string designation = "Director";
}
class Child : Father
{
	public string secondname = "Red";
	public string degree = "Science";
	public void display()
	{
		Console.WriteLine("First Name is " + firstname);
		//Console.WriteLine(designation); //Can't access because it is private 
		Console.WriteLine("Second Name is " + secondname);
		Console.WriteLine("Address is " + address);
	}
	public static void Main(string[] args)
	{
		Child c1=new Child();
		c1.display();
	}
}

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Question 4
Write a Console or Windows application to illustrate the concept of Overloading in C#.

Answer

using System;
class Rect
{
	double length;
	double width;
	double area;
	public Rect()
	{
		length=0;
		width=0;
	}
	public void setData()
	{
		length=0;
		width=0;
	}
	public void setData(double l)
	{
		length=l;
		width=l;
	}
	public void setData(double l, double w)
	{
		length=l;
		width=w;
	}
	public void calArea()
	{
		area = length * width;
	}
	public void displayData()
	{
		Console.WriteLine("Lenght={0}", length);
		Console.WriteLine("Width={0}", width);
		Console.WriteLine("Area={0}", area);
		Console.WriteLine("------------------------------");
	}
	public static void Main(string[] args)
	{
		Rect r1=new Rect();
		r1.calArea();
		r1.displayData();
		Rect r2=new Rect();
		r2. setData(12);
		r2.calArea();
		r2.displayData();
		Rect r3=new Rect();
		r3. setData(10,15);
		r3.calArea();
		r3.displayData();
	}
}

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