II. Variable

 II. Variable

A variable is a name given to a memory location and all the operations done on the variable effects that memory location. In C#, all the variables must be declared before they can be used. It is the basic unit of storage in a program. The value stored in a variable can be changed during program execution. 

II.1. Variable Declaration

Used to declare a variable. Variables can be implicitly or explicitly typed.

Variables declared this way (without a static modifier) within classes are called instance variables. They belong to an instance of the class (i.e. an object).

II.2. Declaration Multiple Variables

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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.

II.3. Declaring Variable as needed for Loop

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.

II.4. Multiple Equals Signs for Initialization

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.

 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.