Variables are storage areas that hold data that can vary during the execution of a program. A symbolic name is the name given to any entity in a program, including variables, constants, functions, procedures and various other stuff.
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A variable has different aspects, such as: name, type, value (inital and current), location, scope... The name of a variable is an identifier.
Global Variables Or: variables with names longer than 128 characters.
Identifiers or symbols are the names you supply for variables,type,function and labels.Identifiers names must differ in spelling and case from any keyword.you cannot use keyword as an identifier.you can create an identifier by specifying it in the declaration of a variable,type or function.
member variables
In C++ all names (including variables) must be declared before they can be used.
A single memory position variable can store only one value of its type. An array can store n number of values, where n is the size of the array.