1) Develop a calculator program which will subtract, add, multiply, or divide two numbers input given by a user.
Your program design must consist of the following:
a) The main menu of your program is to continue to prompt user for an arithmetic choice till the user enters a sentinel value in order to quit the calculator program.
b) When the user selects an arithmetic operation (i.e. addition) the operation is to continue to be performed (that is, prompting the user for each number, displaying the result, prompting the user to add two more different numbers) until the user enters a sentinel value to end the chosen arithmetic operation.
c) If user selects division, do not permit the user to divide by 0. Show an error message to the user and ask the user to select another denominator.