Vickys Progr@mming environment

Before talking about variable we shall first know What is a variable ?
A variable is a location in a memory that has a name and holds some value. the value can be an integer, character, decimal. A variable is declared with a specific data type in order to represent what value the variable holds.

Naming the variables in C#

1. Must begin with a character or an underscore and it should be followed by sequence of characters. can not declare a variable which starts with a digit or any other special symbols (other than underscore).

2. a variable should not contain any special symbols . keywords can not be used as variable names.

Examples for valid variable names
Game_level
Myclass (using pascal case).
sum_of_individual_num.

invalid variable names
#result
2score

Note: C# is a case sensitive language. It means that uppercase letters are different from lower case. exam: TennisPlayerName is diff from tennisplayername

Declaring a variable in C#
datatype variablename ;

we can also define a variable at the time of declaration
datatype variablename=value;

exam:
int result;
char choice='v';

data types in C#

predefined type Bytes Range