Question

At what point of time a variable comes into existence in memory is determined by its

Answer 1

The answer is storage class.

At what point of time a variable comes into existence in memory is determined by its storage class. Storage class is a common feature in object oriented programming languages such as C++.

The storage class for a variable determines its visibility and lifetime. The visibility of a variable determines the module of the program that accesses the variable. On the other hand, the lifetime of the variable determines the duration how long the variable is active.