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Question 29 (3 points) Here is a function declaration: void goo(int x) x 1 Suppose that a is an int* variable pointing to some integer, and *a is equal to zero What is printed if you print "a after the function call goo(a)? None of the above address of a 0 address of x Question 30 (3 points) Which situation does not use the copy constructor? Declaring a variable to be a copy of another existing object Returning a value from a function Calling a function with a reference parameter All of the above situations use the copy constructor Calling a function with a value parameter Question 31 (3 points) Suppose that you want to develop two different operators that calculate and return an object of some class. Which statement is correct? One operator must be a friend and the other must not One operator must be public and the other private The operators must have a different parameter lists. It is not possible to have two different +operators