Day 5: C# – Basic Program Syntax

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C# is an object-oriented programming language.

Output Screen

Syntax:

using System;

namespace HelloWorld.RectangleApplication
{
    public class Rectangle
    {
        // member variables
        double length;
        double width;

        public void Acceptdetails()
        {
            length = 2.5;
            width = 5;
        }
        public double GetArea()
        {
            return length * width;
        }
        public void Display()
        {
            Console.WriteLine("Length: {0}", length);
            Console.WriteLine("Width: {0}", width);
            Console.WriteLine("Area: {0}", GetArea());
        }
    }
}

//program.cs

using HelloWorld.RectangleApplication;

Rectangle r = new Rectangle();
r.Acceptdetails();
r.Display();
Console.ReadLine();

Length: 2.5
Width: 5
Area: 12.5

1. using system

The using keyword is used for including the namespaces in the program. A program can include multiple using statements.

2. namespace HelloWorld.RectangleApplication;

To specify the namespace so that later others can use this class with the help of using keyword.

3. class Rectangle

class keyword is used for declaring a class.

4. Member Variables

double length;

double width;

5. Member function

Acceptdetails();

Display();

GetArea();

6. Comments in C#

/*
Multiline Comment
*/

// Single Line

7. Instantiating Class

Rectangle r = new Rectangle();

8. Call Member Function

         r.Acceptdetails();
         r.Display();
         Console.ReadLine(); 

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Vicky Chhetri

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https://vickychhetri.com/

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Vicky Chhetri

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