What is C# Variables ? / C# Variables क्या हैं ?
C# Variables
Variables are containers for storing data values.
In C#, there are different types of variables (defined with different keywords), for example:
int- stores integers (whole numbers), without decimals, such as 123 or -123double- stores floating point numbers, with decimals, such as 19.99 or -19.99char- stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotesstring- stores text, such as "Hello World". String values are surrounded by double quotesbool- stores values with two states: true or false
Declaring (Creating) Variables
To create a variable, you must specify the type and assign it a value:
Syntax
type variableName = value;
Where type is a C# type (such as
int or string), and variableName is the name of the variable (such as x or name). The equal sign is used to assign values to the variable.
To create a variable that should store text, look at the following example:
Example
Create a variable called name of type
string and assign it the value "John":string name = "John";
Console.WriteLine(name);
To create a variable that should store a number, look at the following example:
Example
Create a variable called myNum of type
int and assign it the value 15:int myNum = 15;
Console.WriteLine(myNum);
You can also declare a variable without assigning the value, and assign the value later:
Example
int myNum;
myNum = 15;
Console.WriteLine(myNum);
A demonstration of how to declare variables of other types:
Example
int myNum = 5;
float myFloatNum = 5.99f;
char myLetter = 'D';
bool myBool = true;
string myText = "Hello";
You will learn more about data types in the next chapter.
Display Variables
The
WriteLine() method is often used to display variable values to the console window.
To combine both text and a variable, use the
+ character:Example
string name = "John";
Console.WriteLine("Hello " + name);
You can also use the
+ character to add a variable to another variable:Example
string firstName = "John ";
string lastName = "Doe";
string fullName = firstName + lastName;
Console.WriteLine(fullName);
For numeric values, the
+ character works as a mathematical operator (notice that we use int (integer) variables here):Example
int x = 5;
int y = 6;
Console.WriteLine(x + y); // Print the value of x + y
From the example above, you can expect:
- x stores the value 5
- y stores the value 6
- Then we use the
WriteLine()method to display the value of x + y, which is 11
Declare Many Variables
To declare more than one variable of the same type, use a comma-separated list:
Example
int x = 5, y = 6, z = 50;
Console.WriteLine(x + y + z);
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