Question

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

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

Answer 1

The operator[] uses an lvalue when called to write a value.

Step-by-step explanation:

The operator[] is used to access elements inside an array or container. When this operator is called to write a value, it uses an lvalue. An lvalue is a value that refers to an object or data structure that has a persistent memory location.

When you use the operator[] to write a value, you are modifying the value at a specific memory location. This requires an lvalue because the value being modified needs to have a persistent memory location that can be accessed and updated.

For example, let's say we have an array named numbers. If we want to change the value of the element at index 0, we can use the operator[] like this: numbers[0] = 10; Here, 0 is an lvalue because it refers to a specific memory location that can be modified.