Program: Terminal Calculator

Write a Python program that implements a calculator in the terminal. Your program should accept an

entire expression as input. You can assume that the expression will always be composed of a left$-$hand

numeric value, an arithmetic operator, and a right$-$hand numeric value. See the example output for what

the expression looks like. Your program should be able to interpret and compute the result of the

following operators:

Addition $(+)$

Subtraction $(-)$

Multiplication $(*)$

Division $(/)$

Modulus $(\%)$

$,$ Power $(**)$

Floor Division $(//)$

Each of the operators should be implemented as separate functions where their arguments are the left$-$

hand side value and the right$-$hand side value of the expression. E$.$g$.$ addition $($left$,$ right$).$ Finally, your

program should output the result to the terminal.

Your calculator program should allow the user to enter multiple arithmetic expressions as input until a

stop word is detected to end the program. There should be at least two valid stop words, one of which

should be a single$-$letter shortcut. Ex$.$ 'quit' and $\text{'}q\text{'}.$

Note: Your calculator must support floating$-$point inputs and results. Also, your program should provide

an error message when an invalid operator or expression is entered.