Simple calculator in Python

  Simple calculator in Python

import tkinter as tk

from tkinter import messagebox

def perform_operation(operation):

    try:

        x = float(entry_x.get())

        y = float(entry_y.get())

        if operation == 'add':

            result = x + y

        elif operation == 'subtract':

            # Switch order if y is greater than x

            if y > x:

                result = y - x

            else:

                result = x - y

        elif operation == 'multiply':

            result = x * y

        elif operation == 'divide':

            # Switch order if y is greater than x

            if y > x:

                result = y / x

            else:

                result = x / y

                if y > x:

                    messagebox.showwarning("Warning", "Note: y is greater than x in the division operation.")

        result_label.config(text=f"Result: {result}")

        return result

    except ValueError:

        messagebox.showerror("Error", "Invalid input. Please enter valid numbers.")

        return None

# Function to calculate and display all results

def calculate_all_results():

    if entry_x.get() == '' or entry_y.get() == '':

        messagebox.showwarning("Warning", "Please enter numbers before calculating.")

        return

    add_result = perform_operation('add')

    subtract_result = perform_operation('subtract')

    multiply_result = perform_operation('multiply')

    divide_result = perform_operation('divide')

    results = []

    if add_result is not None:

        results.append(f"Addition: {add_result}\n")

    if subtract_result is not None:

        results.append(f"Subtraction: {subtract_result}\n")

    if multiply_result is not None:

        results.append(f"Multiplication: {multiply_result}\n")

    if divide_result is not None:

        results.append(f"Division: {divide_result}\n")

    if not results:

        messagebox.showerror("Error", "Invalid input. Please enter valid numbers.")

    else:

        messagebox.showinfo("Results", "".join(results))

# Function to reset the entries and result label

def reset_entries():

    entry_x.delete(0, tk.END)

    entry_y.delete(0, tk.END)

    result_label.config(text="Result:")

    entry_x.focus_set()

# Create the main window

root = tk.Tk()

root.title("Simple Calculator")

# Set the size of the window

root.geometry("300x250")

# Create entry widgets

entry_x = tk.Entry(root, width=10)

entry_y = tk.Entry(root, width=10)

# Create and place labels

label_x = tk.Label(root, text="Enter x:")

label_y = tk.Label(root, text="Enter y:")

result_label = tk.Label(root, text="Result:")

label_x.grid(row=0, column=0, padx=10, pady=5)

label_y.grid(row=1, column=0, padx=10, pady=5)

entry_x.grid(row=0, column=1, padx=10, pady=5)

entry_y.grid(row=1, column=1, padx=10, pady=5)

result_label.grid(row=2, column=0, columnspan=2, pady=10)

# Create and place buttons

add_button = tk.Button(root, text="Add", command=lambda: perform_operation('add'))

subtract_button = tk.Button(root, text="Subtract", command=lambda: perform_operation('subtract'))

multiply_button = tk.Button(root, text="Multiply", command=lambda: perform_operation('multiply'))

divide_button = tk.Button(root, text="Divide", command=lambda: perform_operation('divide'))

calculate_all_button = tk.Button(root, text="Calculate All", command=calculate_all_results)

reset_button = tk.Button(root, text="Reset", command=reset_entries)

add_button.grid(row=3, column=0, pady=5)

subtract_button.grid(row=3, column=1, pady=5)

multiply_button.grid(row=4, column=0, pady=5)

divide_button.grid(row=4, column=1, pady=5)

calculate_all_button.grid(row=5, column=0,padx=5, pady=5)

reset_button.grid(row=5, column=1, pady=5)

# Set focus on entry_x

entry_x.focus_set()

# Run the GUI

root.mainloop()