Question

Create a program using python that provides a simple calculator:

Requires a login with a prompt for a username and a password prior to using the calculator

If username and password are incorrect, the program should re-prompt to re-enter correct username and password

Once logged in, the user should have access to the calculator and should have the ability for the following mathematical operators:

Addition Subtraction

Multiplication

Division

Square Root

PI

Exponents

Answer 1

# to use sqrt, pi  bulit in fucntion

import math

# fucntion to calculate addition

def addition(num1, num2):

    return num1 + num2

# fucntion to calculate subtraction

def subtraction(num1, num2):

    return num1 - num2

# fucntion to calculate multiplication

def multiplication(num1, num2):

    return num1 * num2

# fucntion to calculate division

def division(num1, num2):

    return num1/ num2

# fucntion to calculate square root

def squareRoot(num):

    return math.sqrt(num)

    

# fucntion return the value of PI

def pi():

    return math.pi

# fucntion to calculate exponent

def exponent(num):

    return math.exp(num)

# fucntion show to options to user

def options():

    print("------Calculator-----")

    print("1.Addition\n2.Subtraction\n3.Multiplication\n4.Division\n5.Square Root\n6.PI\n7.Exponent")

    choice = int(input("Enter your choice: "))

    return choice

# fucntion to print the result

def printResult(result):

    print("Result: " + str(result))

# main fucntion

def main():

    username = input("Enter the username: ")

    password = input("Enter the password: ")

    # lets username is 'username' and password is 'password'

    # checking user name and password

    if username == 'username' and password == 'password':

        # getting user's choice

        choice = options()

        # checking user choice

        if choice == 1:

            num1 = float(input("Enter the first number: "))

            num2 = float(input("Enter the second number: "))

            result = addition(num1, num2)

            # printing the reslult

            printResult(result)

        elif choice == 2:

            num1 = float(input("Enter the first number: "))

            num2 = float(input("Enter the second number: "))

            result = subtraction(num1, num2)

            # printing the reslult

            printResult(result)

        elif choice == 3:

            num1 = float(input("Enter the first number: "))

            num2 = float(input("Enter the second number: "))

            result = multiplication(num1, num2)

            # printing the reslult

            printResult(result)

        elif choice == 4:

            num1 = float(input("Enter the first number: "))

            num2 = float(input("Enter the second number: "))

            result = division(num1, num2)

            # printing the reslult

            printResult(result)

        elif choice == 5:

            num = float(input("Enter the number: "))

            result = squareRoot(num)

            # printing the reslult

            printResult(result)

        elif choice == 6:

            print("Value of PI is: " + str(pi()))

        elif choice == 7:

            num = float(input("Enter the number: "))

            result = exponent(num)

            # printing the reslult

            printResult(result)

        else:

            print("Wrong option selected :(:( ")

    else:

        print("Incorrect username or password :(:( ")

if __name__ == "__main__":

    #  calling the main function

    main()

Note: Let me know if you have any doubt..