ANSWER THE FOLLOWING, IT IS A CONTINUOUS QUESTION SO ANSWER THE FIRST PART TO COMPLETE THE REST OF THE PARTS

PART 1:

class Stack - the main class for Stack

PART 2:

class StackCalc: a class that extends (inherit) the functionalities of the class Stack using simple operations on float (+, -, *, /) if we have at least two items-

PART 3:

the main program user that implements the interactive calculator provided here, with an example output for solving:

infix 3*(9-5) ==> postfix 395-*