# 20210905
# R. Dawes

from tkinter import *

window = Tk()
window.title("Simple Calculator")
window.geometry("450x300")

# get the next number
get_num1_label = Label(window,text="Enter an integer")
num1 = Entry(window, width = 10)

# show the current total
show_total_label = Label(window,text="Total")

# place these things on the window
get_num1_label.grid(column = 0,row = 0)
num1.grid(column = 1, row = 0)
show_total_label.grid(column = 0, row = 3)

total = 0



def add_clicked():
   global total
   x = num1.get()
   total = total + int(x)
   show_total_label.configure(text = str(total))
   num1.delete(0,'end')
   
def subtract_clicked():
   global total
   x = num1.get()
   total = total - int(x)
   show_total_label.configure(text = str(total))
   num1.delete(0,'end')
   
def multiply_clicked():
   global total
   x = num1.get()
   total = total * int(x)
   show_total_label.configure(text = str(total))
   num1.delete(0,'end')
   
def divide_clicked():
   global total
   x = num1.get()
   total = total / float(x)
   show_total_label.configure(text = str(total))
   num1.delete(0,'end')
   
   
add_button = Button(window, text = "+", command = add_clicked)
subtract_button = Button(window, text = "-", command = subtract_clicked)
multiply_button = Button(window, text = "*", command = multiply_clicked)
divide_button = Button(window, text = "/", command = divide_clicked)

add_button.grid(column = 4, row = 1)
subtract_button.grid(column = 4, row = 2)
multiply_button.grid(column = 4, row = 3)
divide_button.grid(column = 4, row = 4)



# start the process   
window.mainloop()