C# Variable
C# Variable
A variable is a name of memory location. It is used to store data. Its value can be changed and it can be reused many times.
It is a way to represent memory location through symbol so that it can be easily identified.
The basic variable type available in C# can be categorized as:
| Variable Type | Example |
|---|---|
| Decimal types | decimal |
| Boolean types | True or false value, as assigned |
| Integral types | int, char, byte, short, long |
| Floating point types | float and double |
| Nullable types | Nullable data types |
Let's see the syntax to declare a variable:
type variable_list;
The example of declaring variable is given below:
int i, j;
double d;
float f;
char ch;
Here, i, j, d, f, ch are variables and int, double, float, char are data types.
We can also provide values while declaring the variables as given below:
int i=2,j=4; //declaring 2 variable of integer type
float f=40.2;
char ch='B';Rules for defining variables
A variable can have alphabets, digits and underscore.
A variable name can start with alphabet and underscore only. It can't start with digit.
No white space is allowed within variable name.
A variable name must not be any reserved word or keyword e.g. char, float etc.
Valid variable names:
int x;
int _x;
int k20;Invalid variable names:
int 4;
int x y;
int double;
