If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

The operator used to access data members of a structure through a pointer variable is the "->" operator.

Here's a step-by-step explanation:

1. In C and C++, a structure is a user-defined data type that allows you to combine data items of different kinds.

2. A pointer is a variable that stores the memory address of another variable. A pointer to a structure is a variable that holds the memory address of a structure.

3. To access data members of a structure directly, you would typically use the dot operator (.). For example, if you have a structure named "student" with a member "name", you could access it with "student.name".

4. However, if you have a pointer to a structure, you need to dereference the pointer to access the structure's members. This is where the "->" operator comes in.

5. If "p" is a pointer to a structure, you would access the structure's members using "p->member". For example, if "p" is a pointer to a "student" structure, you could access the "name" member with "p->name".

6. The "->" operator automatically dereferences the pointer, allowing you to access the structure's members directly.