USING C# (C Sharp)

In this assignment you will implement the undo feature for a simple calculator. The undo feature must be implemented using a generic or template-b structure. You may utilize language supplied libraries (e.g. java.util.stack) or a stack implementation of your own design. The undo feature must allow for an unlimited number of undo operations. If the user attempts to perform an undo operation and the stack is empty, then a message must be displayed indicating that there are no commands to undo. ased Stack data The calculator portion of the assi be implemented in a stand-alone class called 'Calculator. The calculator must support only the following operations: addition (+), subtraction), multiplication ("), and division (). The calculator must support whole and real numbers. ignment must function as follows. The calculator must The calculator must support the following commands: UNDO, CLEAR, EXIT UNDO: Ignores the prior calculation and restores state as if the calculation never occurred. If there are no prior calculations to ignore, then display the message UNDO IS NOT AVAILABLE" or calculation request. CLEAR: Resets the calculator to the initial state, returns the Running Total to 0, and clears the undo stack. EXIT: Terminates the program without producing any results. and request the user to enter a command Any command that does not start with one of the preceding three commands is expected to be a calculation request in the following format: real-literal operation real-literal (continued on the next page)