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if the value is the same from one object to another. One class instance can change values of its instance variables without affecting all other instances. A class may have both instance variables and class variables.

Instance variables can be used by all instance methods of an object, but may not be used by class methods. An instance variable may also be changed directly, provided access restrictions are set.

Examples

C++

class Request {private: static inline int count1 = 0; int number;public: // constructor modifies the instance variable "this->number" Request(): number{count1} { ++count1; // modifies the class variable "Request::count1" }

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