Simple Calculator Program in Python 🧮

Overview

This Python script implements a simple calculator capable of performing basic arithmetic operations such as addition, subtraction, multiplication, and division. Users interact with the program via a command-line interface, selecting an operation, inputting two numbers, and viewing the results. The script also provides an option to exit the program by pressing 'e' or 'E'.

Code Explanation

from tkinter import E

while True:

    print("_____HELLO USER_____")

    print(   )

    print("Press 1 for Addition")
    print("Press 2 for Subtraction")
    print("Press 3 for Multiplication")
    print("Press 4 for Division")
    print("Press e or E to exit")
    print("Press enter to continue") 

    print(   )

    choice = input("Choose your option : ")
    if choice == "e" or choice == "E":
        break

    num1 = float(input("Enter your first number 1 : "))
    num2 = float(input("Enter your second number 2 : "))

    if choice == "1":
        print(num1, "+", num2, "=", (num1 + num2))
    elif choice == "2":
        print(num1, "-", num2, "=", (num1 - num2))
    elif choice == "3":
        print(num1, "", num2, "=", (num1  num2))
    elif choice == "4":
        if num2 == 0:
            print(num1, "/", num2, "=", "not defined")
        else:
            print(num1, "/", num2, "=", (num1 / num2))
    else:
        print("invalid")

Detailed Breakdown

1. Importing Modules:

   from tkinter import E

   • This line imports the constant E from the tkinter module. However, in this script, tkinter is unnecessary and can be removed.

2. Infinite Loop:

   while True:

   • This initiates an infinite loop to keep the calculator running until the user decides to exit.

3. User Instructions:

   print("_____HELLO USER_____")
   print(   )
   print("Press 1 for Addition")
   print("Press 2 for Subtraction")
   print("Press 3 for Multiplication")
   print("Press 4 for Division")
   print("Press e or E to exit")
   print("Press enter to continue")
   print(   )

   • These lines display the menu options for the user to choose from.

4. User Choice Input:

   choice = input("Choose your option : ")

   • Prompts the user to select an operation. If 'e' or 'E' is entered, the loop breaks, ending the program.

5. Number Inputs:

   num1 = float(input("Enter your first number 1 : "))
   num2 = float(input("Enter your second number 2 : "))

   • Requests the user to input two numbers, which are converted to floating-point values for calculations.

6. Performing Calculations:

   if choice == "1":
       print(num1, "+", num2, "=", (num1 + num2))
   elif choice == "2":
       print(num1, "-", num2, "=", (num1 - num2))
   elif choice == "3":
       print(num1, "", num2, "=", (num1  num2))
   elif choice == "4":
       if num2 == 0:
           print(num1, "/", num2, "=", "not defined")
       else:
           print(num1, "/", num2, "=", (num1 / num2))
   else:
       print("invalid")

   • Based on the user's choice, the calculator performs the requested arithmetic operation:
     • Addition: Computes the sum of num1 and num2.
     • Subtraction: Computes the difference between num1 and num2.
     • Multiplication: Computes the product of num1 and num2.
     • Division: Computes the quotient of num1 divided by num2, with a check to avoid division by zero.

GUI Consideration

The tkinter module is imported but not used in this script. Typically, tkinter is employed for creating graphical user interfaces. For a GUI version of this calculator, you could use tkinter to design buttons, input fields, and displays. Here’s a brief example of how you might start a tkinter GUI application:

import tkinter as tk

def on_button_click(operation):
    # Define what happens when a button is clicked
    pass

root = tk.Tk()
root.title("Simple Calculator")

frame = tk.Frame(root)
frame.pack()

button_add = tk.Button(frame, text="Add", command=lambda: on_button_click("add"))
button_add.pack(side=tk.LEFT)

# Add more buttons for other operations

root.mainloop()

How to Run

1. Save the Script: Save the provided Python code in a file named calculator.py.
2. Run the Script: Open a terminal or command prompt, navigate to the directory containing calculator.py, and run:

   python calculator.py

3. Interact with the Calculator: Follow the on-screen instructions to perform calculations or exit the program.

Thank you for exploring this simple calculator program! 😊🧮