#functions for all the basic math operators typically found on simple calculators
# operators:
Add
subtract
multiply
divide
#Function #operate that takes an operator and 2 numbers then calls one of the above functions on the numbers
#function that populates the display
#store the first number that is input into the calculator when a user presses an operator
#save which operation has been chosen and #operate() on then when the equal sign is pressed
#display is populated and updated with the solution to the operation once #operate() has been called
# Users being able to string together several operations and get the right answer with each pair of numbers being evaluated at a time eg 12+7-5*3=42;
# Not evaluate more than a single pair at a time
# round numbers with long decimals
# pressing equal sign before entering the numbers or operator should show an error
# pressing #clear should wipe out any existing data and the user is starting afresh
# display an error when a user decides to divide by zero
#decimals....
#backspace button so the user can undo if they click the wrong number.
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