Simple calculator using Python

By Sudipta Ghosh

The project aims to design a calculator (addition, multiplication, subtraction, division) using Python.

In this project, I declare four functions:
1.addition
2.subtraction
3.multiplication
4.division
then I return the values as variables a and b.

# addition of two numbers
def addition(a, b):
    return a + b

#  subtraction of  two numbers
def subtraction(a, b):
    return a - b

#  multiplication two numbers
def multiplication(a, b):
    return a * b

#  divition of two numbers
def divition(a, b):
    return a / b

Then I take a while loop and inside the while loop, I give the select option as 1,2,3,4 so that users can select as per their choice. Here I take the input from the users and return the calculated answer.

print("Select operation.")
print("1.Addition")
print("2.Subtraction")
print("3.Multiplication")
print("4.Divition")

while True:
    # Take input from the user
    select = input("SELECT(1/2/3/4): ")

    # Check if choice is one of the four options
    if select in ('1', '2', '3', '4'):
        n1 = float(input("Enter the 1st number: "))
        n2 = float(input("Enter the 2nd number: "))

        if select == '1':
            print(n1, "+", n2, "=", addition(n1, n2))

        elif select == '2':
            print(n1, "-", n2, "=", subtraction(n1, n2))

        elif select == '3':
            print(n1, "*", n2, "=", multiplication(n1, n2))

        elif select == '4':
            print(n1, "/", n2, "=", divition(n1, n2))
        break
    else:
        print("Invalid Input")

After successfully running the code, the output is coming as follows:

Select operation.
1.Addition
2.Subtraction
3.Multiplication
4.Divition
SELECT(1/2/3/4): 4
Enter the 1st number: 9
Enter the 2nd number: 3
9.0 / 3.0 = 3.0