Now before going to discuss what a C# Variable in the context of programming language. We should know what the variable word means in the context of Programming language.

Variable in General Programming language

A Variable is a particular container with a datatype and name, and a value that can be stored in it is called a variable. We can do multiple operations on it depending on their datatypes. Now, what is a data type? We shall discuss this in the next post. Now consider a Variable as a container or a thing that can store values means it can be of any datatype, i.e., it can be alphabets, it can be a string, it can be an integer, it can be a floating point number or complex number okay look here below the syntax of variable in general programming languages:

Syntax of Variable in General Programming language

I hope you are aware of the word Syntax. If not so, look, Syntax is a structure or way of writing particular code in a particular programming language. So for more confirmation and knowledge, you can check our detailed post on its Syntax in C#, C++, JAVA, and Python. Now here below is the Syntax of a Variable okay:

[varaible data type] + [varaible name] = [value of variable]

I also make visual representation of a variable hope you like it.

For example : making integers variable age and assigning it value 18 okay using JAVA syntax.

int age =18;

C# Variable in C# Programming language

Now see how ca we declare a variable in C# it is same like as in C++ & JAVA . First we have to create or choose type of variable or you can say datatype of a variable then it’s name and it’s value.

Syntax of C# Variable in C# Programming language

[varaible data type] + [varaible name] = [value of variable]

I also make visual representation of a variable hope you like it.

For example : making integers variable age and assigning it value 18 okay using C# syntax.

int age =18;

Other Example:

using System;

namespace codelikechamp
{
  class Program
  {
    static void Main(string[] args)
    {
      int Num;
      Num = 1000;
      Console.WriteLine(Num);
     }
  }
}

Output:

1000

How to create many or multiple C# Variable

We can declare more than one variable of the same type, there are two ways see below:

First way:

using System;

namespace codelikechamp
{
  class Program
  {
    static void Main(string[] args)
    {
      int x = 10;
      int y = 20;
      int z = 30; 
      Console.WriteLine(x + y + z);
    }
  }
}

Output:

60

Second way(it is recommended):

using System;

namespace codelikechamp
{
  class Program
  {
    static void Main(string[] args)
    {
      int x = 10, y = 20, z = 30;
      Console.WriteLine(x + y + z);
    }
  }
}

Output:

60

How to assign one value to multiple C# Variable

We can also assign the same value to multiple variables in one line so this reduce our line of code:

First way:

using System;

namespace codelikechamp
{
  class Program
  {
    static void Main(string[] args)
    {
      int x, y, z;
      x = 10;
      y = 10;
      z = 10;
      Console.WriteLine(x + y + z);
    }
  }
}

Output:

30

Second way(it is recommended):

using System;

namespace codelikechamp
{
  class Program
  {
    static void Main(string[] args)
    {
      int x, y, z;
      x = y = z = 10;
      Console.WriteLine(x + y + z);
    }
  }
}

Output:

30

Identifiers in C# Variable

All C# variables can be of any datatype and must be identified with unique names. These impressive names are called identifiers. They can be short names (like a and b) or more descriptive names (age, sum, total volume).

Note: It is recommended to avoid short names; instead of this, use descriptive names/variable names to create understandable and maintainable code:

using System;

namespace codelikechamp
{
  class Program
  {
    static void Main(string[] args)
    {
      // Good
      int secondsPerminute = 60;

      // OK, but not so easy to understand what s actually is
      int s = 60;
      
      Console.WriteLine(secondsPerminute);
      Console.WriteLine(s);
    }
  }
}

Output:

60
60

Rules for naming C# Variable:

The general rules for naming a variables in C# are:

1-Names can contain letters(a,b,c etc), digits(1,2,3), underscores(_), and dollar signs($ etc)
2-Names must begin with a letter.
3-Names should start with a lowercase letter and it cannot contain whitespace
4-Names can also begin with $ and _ (but we will not use it in this blog)
5-Names are case sensitive (“codelikechamp” and “codelikeChamp” are different variables)
6-Reserved words (like C# keywords, such as int or double) cannot be used as names

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