Complete Modern C++ - Union - I

The video tutorial introduces unions in C programming, explaining how they allow multiple members to share the same memory space, which is beneficial for saving space, especially on embedded platforms. It highlights the disadvantages, such as the inability to determine the active member and the need for manual implementation of constructors and destructors. The tutorial provides an example of creating a union with an integer and a character, demonstrating initialization and memory usage. It concludes by discussing the size of a union, determined by its largest member.

What is a key advantage of using unions in C?

• They support virtual functions.

• They enable memory sharing among members.

• They allow for multiple inheritance.

• They automatically manage constructors and destructors.

Which of the following is a limitation of unions in C?

• Unions can contain virtual functions.

• Unions automatically destroy user-defined types.

• Unions can have multiple active members at once.

• Unions cannot have a base class.

In C-11, what must be provided for a union with user-defined constructors?

• Automatic destructor invocation.

• Support for virtual functions.

• Multiple inheritance capabilities.

• Manual implementation of constructors and destructors.

When defining a union in C, what is true about its members?

• All members must be initialized simultaneously.

• Members can be inherited from a base class.

• Members are private by default.

• Only one member can be initialized at a time.

How is the size of a union determined in C?

• By the sum of all its members' sizes.

• By the size of its smallest member.

• By the size of its largest member.

• By the number of members it contains.