Question

When operator[] is called to read a value, does it use rvalue or lvalue?

a) rvalue
b) lvalue
c) Both, depending on the implementation
d) None of the above

Answer 1

When operator[] is called to read a value, it uses lvalue.

Step-by-step explanation:

The operator[] in C++ is typically used to access elements in an array or a container. When it is used to read a value, it returns an lvalue. An lvalue refers to an object that has a memory location and can be accessed.

For example, consider the following code:

int arr[] = {1, 2, 3, 4, 5};

int x = arr[2];

In this case, arr[2] returns an lvalue because it is accessing the third element of the array which has a memory location.

So, the correct answer to your question is b) lvalue.