Rules For Declaring Variable

The name of the variable contains letters, digits, and underscores.
The name of the variable is case sensitive (ex Arr and arr both are different variables).
The name of the variable does not contain any whitespace and special characters (ex #,$,%,*, etc).
All the variable names must begin with a letter of the alphabet or an underscore(_).
We cannot used C++ keyword(ex float,double,class)as a variable name.

Valid variable names:

int x;   //can be letters 
int _yz; //can be underscores   
int z40;//can be letters

Invalid variable names:

int 89; Should not be a number   
int a b; //Should not contain any whitespace    
int double;// C++ keyword CAN NOT BE USED

C++ Variables

Variables in C++ is a name given to a memory location. It is the basic unit of storage in a program.

The value stored in a variable can be changed during program execution.
A variable is only a name given to a memory location, all the operations done on the variable effects that memory location.
In C++, all the variables must be declared before use.

Tags:

#CPP-Basics #C++ #CPP