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? ans. -> * . &

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++, structures are user-defined data types that allow us to store different types of data items together.

2. If we have a pointer to a structure, we can't directly use the dot (.) operator to access the structure's members, because the dot operator is used when we have an actual instance of the structure.

3. Instead, we use the arrow (->) operator. The arrow operator is used with a pointer to an object to access the object's members.

4. For example, if we have a pointer p to a structure s with a member m, we would use p->m to access the member m of the structure pointed to by p.

5. The "*" operator is used to dereference a pointer, i.e., to get the value that the pointer points to. The "&" operator is used to get the address of a variable. But neither of these operators is used to access members of a structure through a pointer.