04 C# Syntax

Here’s the time to know what is the syntax of C#, as we know C# is an Object-Oriented programming language.In Object-Oriented Programming methodology, a program consists of various objects that interact with each other by means of actions. The actions that an object may take are called methods. Objects of the same kind are said to have the same type or, more often, are said to be in the same class. 

For example, let us consider a Rectangle object. It has attributes like length and width. Depending upon the design, it may need ways for accepting the values of these attributes, calculating area and display details.

Let us look at an implementation of a Rectangle class and discuss C# basic syntax, on the basis of our observations in it:

using system;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace RectangleApplication
{
   class Rectangle
   {
      // member variables
      double length;
      double width;
      public void Acceptdetails()
      {
         length = 4.5;
         width = 3.5;
      }
      public double GetArea()
      {
         return length * width;
      }
      public void Display()
      {
         Console.WriteLine("Length: {0}", length);
         Console.WriteLine("Width: {0}", width);
         Console.WriteLine("Area: {0}", GetArea());
      }
   }
   class ExecuteRectangle
   {
        static void Main(string[] args)
        {
            Rectangle r = new Rectangle();
            r.Accepdetails();
            r.Display();
            Console.ReadLine();
        }
   }
}

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

Comments in C#
Comments are used for explaining code. Compilers ignore the comment entries.
The multiline comments in C# programs start with /* and terminates with the characters */ as shown below:
/* This program demonstrates The basic syntax of C# programming Language */
Single-line comments are indicated by the ‘//’ symbol.
For example: //end class Rectangle.

Member Variables
Variables are attributes or data members of a class, used for storing data.In the preceding program, the Rectangle class has two member variables named length and width.

Member Functions
Functions are set of statements that perform a specific task. The member functions of a class are declared within the class. Our sample class Rectangle contains three member functions: AcceptDetails, GetArea and Display.

Instantiating a Class
In the preceding program, the class ExecuteRectangle is used as a class, which contains the Main() method and instantiates the Rectangle class.

Identifiers
An identifier is a name used to identify a class, variable, function, or any other user-defined item. The basic rules for naming classes in C# are as follows:

  •  A name must begin with a letter that could be followed by a sequence of letters, digits (0 – 9) or underscore. The first character in an identifier cannot be a digit.
  • It must not contain any embedded space or symbol like ? – +! @ # % ^ & * ( ) [ ] { } . ; : ” ‘ / and \. However, an underscore ( _ ) can be used.
  •  It should not be a C# keyword.

C# Keywords
Keywords are reserved words predefined to the C# compiler. These keywords cannot be used as identifiers; however, if you want to use these keywords as identifiers, you may prefix the keyword with the @ character.
In C#, some identifiers have special meaning in context of code, such as get and set, these are called contextual keywords.

And here’s a link which you will find a table of some Reserved Keywords and Contextual Keywords in C#:
http://sdrv.ms/1bfI1ft

And later we’re going to know the Data types and  and its Conversions.
My best wishes for you and thanks for your appreciated time 🙂
Stay tuned for more 🙂

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