'''
20210923
R. Dawes

New features added in this version:
   We add an "Exit" button to the window so that we don't have to click on the 
   "close window" button in the top corner
   
   We fix the problem of getting "8 > 10" as output.  This problem occurs because
   tkinter Entry widgets always treat their input as strings ... and the string "8" comes
   after the string "10" in lexicographic (dictionary)  order.  To get the desired result
   we convert the input strings to numbers using the built-in "float()" function.
   
   But this causes a new problem:  the information we add to a Text widget can ONLY
   be a string.  So we have to convert the float values back to strings.

'''




import tkinter as tk
import sys                                # because we want to use sys.exit() to close the gui

window = tk.Tk()
window.title("Compare two numbers")
window.geometry("1200x800")


label_1 = tk.Label(window,text="Enter x in this box")
#add an entry box to accept input
entry_1 = tk.Entry(window, width = 10)

label_2 = tk.Label(window,text="Enter y in this box")
#add an entry box to accept input
entry_2 = tk.Entry(window, width = 10)


#add a text box to show output
text_1 = tk.Text(window,height = 10, width = 30)

#add a button - a clickable object

#add a function to react to button_1

def button_1_clicked():
   x = float(entry_1.get())
   y = float(entry_2.get())
   text_1.delete(1.0, tk.END)    # clear the Text box
   if (x < y):
      text_1.insert(tk.END, str(x) + " < " + str(y))
   elif (x > y):
      text_1.insert(tk.END, str(x) + " > " + str(y))
   else:
      text_1.insert(tk.END, str(x) + " = " + str(y))


button_1 = tk.Button(window, text = "Compare Them", command = button_1_clicked)

#add a button to end execution

button_2 = tk.Button(window,text = "Exit", command = sys.exit)


label_1.grid(row = 0, column = 0)
entry_1.grid(row = 0, column = 1)
label_2.grid(row = 1, column = 0)
entry_2.grid(row = 1, column = 1)
button_1.grid(row = 2, column = 0)
text_1.grid(row = 2, column = 2)
button_2.grid(row = 7, column = 10)   
# tkinter doesn't object if you try to put widgets in rows or columns far away 
# from everything else ... it just doesn't waste any space on empty rows or columns
# This placement will look exactly the same as if we placed button_2 in row = 3, column = 3

window.mainloop()