Question

If Circle is a structure, the statement: Circle *pcirc = nullptr; is used for what purpose?

A) Invalid syntax
B) Initializing a structure variable
C) Pointing to a structure variable
D) Defining a structure member

Answer 1

The statement 'Circle *pcirc = nullptr;' initializes a structure pointer to null, which is a safety practice to prevent the pointer from referring to a random memory location.

Step-by-step explanation:

If Circle is a structure, the statement: Circle *pcirc = nullptr; is used for the purpose of initializing a structure variable. Specifically, it initializes a pointer to a Circle structure and sets it to point to null. This is a common practice in programming to ensure that the pointer does not accidentally point to some random memory location. By explicitly setting it to nullptr, the programmer avoids potential undefined behaviors associated with dereferencing uninitialized pointers which could lead to crashes or security vulnerabilities.