You should make a parameter a reference parameter if:
A) You need the function to change the value of the argument passed to the function.
B) you need to be able to change the value of the parameter in the function, but not the value of the argument.
C) Always.
D) If any of the other parameters are reference parameters.

Question

Quizplus · Accepted Answer

If you need the function to change the value of the argument passed to the function, you should make the parameter a reference parameter. This is because passing by reference allows the function to modify the original value, rather than just working with a copy of the value.

You Should Make a Parameter a Reference Parameter If