What is the difference between structures and unions in C programming?

What is the difference between structures and unions in C programming?

In C, a structure allocates memory for all its members, while a union shares memory among its members.

Can you give an example of when to use a structure over a union?

Use a structure when you need to store multiple attributes of an object, like a 'Person' with name and age.

What happens if I try to access a union member that wasn't the last one assigned?

Accessing a union member that wasn't the last assigned can lead to undefined behavior, as the memory is shared.

Are there any performance differences between using structures and unions?

Structures may have a slight overhead due to larger memory allocation, while unions can be more memory efficient.