C# Variables with Examples

In c#, Variables will represent storage locations, and each variable has a particular type that determines what type of values can be stored in the variable.

 

C# is a Strongly Typed programming language. Before we perform any operation on variables, it’s mandatory to define a variable with the required data type to indicate what type of data that variable can hold in our application.

Syntax of C# Variables Declaration

Following is the syntax of declaring and initializing variables in the c# programming language.

 

[Data Type] [Variable Name];
[Data Type] [Variable Name] = [Value];
[Access Specifier] [Data Type] [Variable Name] = [Value];

If you observe the above syntax, we added a required data type before the variable name to tell the compiler about what type of data the variable can hold or which data type the variable belongs to.

 

  • [Data Type] - It’s a type of data the variable can hold, such as integer, string, decimal, etc. 
  • [Variable Name] - It’s the name of the variable to hold the values in our application. 
  • [Value] - Assigning a required value to the variable. 
  • [Access Specifier] - It is used to define access permissions for the variable.

Now we will see how to define variables in our c# applications with examples.

C# Variables Declaration Example

Following is the example of using the variables in the c# programming language.

 

using System;

namespace Tutlane
{
      class Program
      {
           static void Main(string[] args)
           {
                int number = 10;
                string name = "Suresh Dasari";
                double percentage = 10.23;
                char gender = 'M';
                bool isVerified = true;
                Console.WriteLine("Id: " + number);
                Console.WriteLine("Name: " + name);
                Console.WriteLine("Percentage: " + percentage); Console.WriteLine("Gender: " + gender);
                Console.WriteLine("Verified: " + isVerified);
                Console.ReadLine();
          }
     }
}

If you observe the above c# variables example, we defined multiple variables with different data types and assigned values based on our requirements.

Output of C# Variables Declaration Example

When you execute the above program by pressing Ctrl + F5 or clicking on the Start option in the menu bar, you will get the result shown below.

 

C# Variables Declaration Example Result

 

If you observe the above result, we are able to print the variables in our c# application based on our requirements.

Rules to Declare C# Variables

Before we declare and define variables in the c# programming language, we need to follow particular rules.

 

  • You can define a variable name with a combination of alphabets, numbers, and underscore.
  • A variable name must always start with either alphabet or underscore but not with numbers.
  • While defining the variable, no white space is allowed within the variable name.
  • Don't use any reserved keywords such as int, float, char, etc., for a variable name.
  • In c#, once the variable is declared with a particular data type, it cannot be re-declared with a new type, and we shouldn’t assign a value that is not compatible with the declared type.

The following are some valid ways to define the variable names in the c# programming language.

 

int abc;
float a2b;
char _abc;

The following are some of the Invalid ways of defining the variable names in the c# programming language.

 

int a b c;
float 2abc;
char &abc;
double int;

C# Multiple and Multi-Line Variables Declaration

In c#, we can declare and initialize multiple variables of the same data type in a single line by separating with a comma.

 

Following is the example of defining the multiple variables of the same data type in a single line by separating with a comma in the c# programming language.

 

int a, b, c;
float x, y, z = 10.5;

While declaring the multiple variables of the same data type, we can arrange them in multiple lines to make them more readable. The compiler will treat it as a single statement until it encounters a semicolon (;).

 

Following is the simple of defining the multiple variables of the same data type in multiple lines in c# programming language.

 

int a,
    b,
    c;
float x,y,
      z = 10.5;

C# Variables Assignment

In c#, once we declare and assign a value to the variable that can be assigned to another variable of the same data type.

 

Following is the example of assigning a value of one variable to another variable of the same type in c# programming language.

 

int a = 123;
int b = a;
string name = "suresh";
string firstname = name;

In c#, it’s mandatory to assign a value to the variable before we use it; otherwise, we will get a compile-time error.

 

If we try to assign a value of string data type to an integer data type or vice versa, as shown below, we will get an error like “cannot implicitly convert type int to string”.

 

int a = 123;
string name = a;

This is how we can use variables in the c# programming language based on our requirements. 

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