48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
import tkinter as tk
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from tkinter import messagebox
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def calculate():
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try:
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price = float(entry_price.get())
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#quantity = int(entry_quantity.get())
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rate = float(entry_rate.get())
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if price < 0 or rate < 0: #price < 0 or quantity < 0 or rate < 0:
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messagebox.showerror("Error", "Invalid input.", detail="Value cannot be negative.")
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return
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if rate > 100:
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messagebox.showerror("Error", "Invalid input.", detail="Discount rate cannot exceed 100%.")
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return
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#subtotal = price * quantity
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discount = price * rate / 100 #subtotal * rate / 100
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total = price - discount #subtotal - discount
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result_var.set(f"Total: {total:,.2f}")
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except ValueError:
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messagebox.showerror("Error", "Invalid input.", detail="Please enter numeric values. Fractions are allowed for price and discount rate.")
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root = tk.Tk()
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root.title("Discount Calculator")
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root.geometry("280x250")
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tk.Label(root, text="Price").pack(pady=5)
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entry_price = tk.Entry(root, width=20)
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entry_price.pack(pady=5)
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# tk.Label(root, text="Quantity").pack(pady=5)
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# entry_quantity = tk.Entry(root, width=20)
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# entry_quantity.pack(pady=5)
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tk.Label(root, text="Discount (%)").pack(pady=5)
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entry_rate = tk.Entry(root, width=20)
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entry_rate.pack(pady=5)
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tk.Button(root, text="Calculate", command=calculate).pack(pady=10)
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result_var = tk.StringVar()
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tk.Label(root, textvariable=result_var).pack(pady=10)
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root.mainloop()
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