A Variable is the name given to a memory location holding a particular type of data. so, each variable has associated with it a data type and a value type.
| Type | Example |
| Integral types | sbyte, byte, short, ushort, int, uint, long, ulong, and char |
| Floating point types | float and double |
| Decimal types | decimal |
| Boolean types | true or false values, as assigned |
| Nullable types | Nullable data types |
C# also allows defining other value types of variable such as Enum and reference types of variable such as class , which we will cover in subsequent chapters.
Defining Variables
Syntax for variable definition in c# is –
<data_type> <variable_list>;
Here, data_type must be a valid c# data type including char, int, float, double, or any user – defined data type, and variable_list may consist of one or more identifier names separated by commas.
Examples :-
int I,j,k;
char c, ch;
float f, salary;
double d;
You can initialize a variable at the time of definition as –
int i = 100;
Initializing Variables
Variables are initialized (assigned a value) with an equal sign followed by a constant expression. The general form of initialization is –
Variable_name = value;
Variables can be initialized in their declaration. The initializer consists of an equal sign followed by a constant expression as –
<data_type> <variable_name> = value;