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Identifiers Variables Data types and Operators


A Variable is a simple storage location for data.

Data can be assigned and retrieved from a variable.

The interpretation of data in a variable is controlled through “Types”

Variables are declared using this form of statement:

type var-name;

where type is the data type of the variable and var-name is its name

Data Types

C# is a strongly typed language.

The C# typing system contains the following categories:

Value types

Reference types

Variables of the value types store data, while those of the reference types store references to the actual data.

Reference types are also referred to as objects.

Value types store the data on the stack and Reference types stores the data on the heap .


C# provides an extensive set of operators that give the programmer detailed control over the construction and evaluation of expressions.

Most of C#’s operators fall into the following categories:


bit wise,

relational, and


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