Variable In C#
A variable is basically storage in the
computer’s memory where you can put a value that will be used by your program.
The variable has a name, which identifies it among other variables and allows
you to access the value of the variable. It has an address which determines
where in the memory it resides. It has a value that is either assigned by the
user or a result of a calculation although a variable can have a value of null
or nothing.
A variable has a type, which signifies what kind of data the
variable contains. A variable has a lifetime which determines how long in the
program the variable is usable. And finally, a variable has a scope that tells
you where in a program the variable is available for use.
The name of a variable is called an identifier.
The variable's content is accessed or inserted using its identifier. When naming
variables in C#, there are some rules you must follow.
- A variable should start with an alphabet (a-z or A-Z)
- It
cannot contain odd characters such as #,? ^, $.
- You
cannot use any of the reserved words in
C# as names for your variables.
- A variable name cannot contain spaces.
- Variables
are case-sensitive.
- You cannot have two variables with the same name inside the same scope.
A variable has a data type which is the
format or kind of data stored in it. The most common data types are int, double, string, char, float, decimal and
a lot of lot more for storing different kinds of data depending on the situation.
More complex data types can be made in C# by making your own classes or
structures.
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