First commit

README.MD

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+# Discount Calculator Project
+
+This project was created as part of a recruitment task for Koding Next.
+
+It is a python-based GUI app that calculates final price after applying discount.
+
+The purpose of this project is to demonstrate practical skills in programming, problem solving, and basic web development.
+
+# Notes
+Since the task mentionied quantity as a possible input, but the example showed no such input, I created two versions of the app. 
+- `discalc.py` includes all three mentioned fields (price, quantity, discount).
+- `discalc-noqty.py` is the one without quantity field.
+Thank you for your understanding

discalc-noqty.py

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

discalc.py

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+import tkinter as tk
+from tkinter import messagebox
+
+def calculate():
+    try:
+        price = float(entry_price.get())
+        quantity = int(entry_quantity.get())
+        rate = float(entry_rate.get())
+
+        if price < 0 or quantity < 0 or rate < 0:
+            messagebox.showerror("Error", "Invalid input.", detail="Value cannot be negative.")
+            return
+
+        if rate > 100:
+            messagebox.showerror("Error", "Invalid input.", detail="Discount rate cannot exceed 100%.")
+            return
+
+        subtotal = price * quantity
+        discount = subtotal * rate / 100
+        total = subtotal - discount
+
+        result_var.set(f"Total: {total:,.2f}")
+
+    except ValueError:
+        messagebox.showerror("Error", "Invalid input.", detail="Please enter numeric values. Fractions are allowed for price and discount rate.")
+
+
+root = tk.Tk()
+root.title("Discount Calculator")
+root.geometry("280x300")
+tk.Label(root, text="Price").pack(pady=5)
+entry_price = tk.Entry(root, width=20)
+entry_price.pack(pady=5)
+
+tk.Label(root, text="Quantity").pack(pady=5)
+entry_quantity = tk.Entry(root, width=20)
+entry_quantity.pack(pady=5)
+tk.Label(root, text="Discount (%)").pack(pady=5)
+entry_rate = tk.Entry(root, width=20)
+entry_rate.pack(pady=5)
+
+tk.Button(root, text="Calculate", command=calculate).pack(pady=10)
+
+result_var = tk.StringVar()
+tk.Label(root, textvariable=result_var).pack(pady=10)
+
+root.mainloop()