Suppose that stackobj is an object of type stackType > introduced in Chapter 7 , the value of stackTop is 15, and dec is a variable of type double. a. How many elements are in stack? Answer: b. What is the index of the top element of stack? Answer: c. Write the statement that assigns the top element of stack to dec. Answer: d. Write the statement that removes the top element of stack. Answer: e. Write the statement that adds an item in a variable var to the stack