A member function that allows the user of the class to change the value in a data member is known as a mutator function. a mutation. a manipulator function. an accessor function.

Did you know that the term "mutator function" is derived from the concept of "mutating" or changing the state of an object? It allows users to modify private attributes of a class while still keeping those attributes encapsulated. This practice is fundamental in Object-Oriented Programming as it helps maintain data integrity while allowing flexibility for changes! In real-world applications, mutator functions are commonly used in software that requires user input to update data. For example, in a banking application, a mutator function might update a user's account balance when they make a deposit. This ensures that only valid operations are performed, keeping the data secure and accurate!