When an argument is passed by reference,

1. a variable is created in the function to hold the argument's value.
2. the function cannot access the argument's value.
3. a temporary variable is created in the calling program to hold the argument's value.
4. the function accesses the argument's original value in the calling program.

What is the principal reason for passing arguments by reference ? In a function call, what all data items can be passed by reference ?

What are the three types of functions in Java?

Write a function that interchanges the value of two integers A and B without using any extra variable.