Question

(code in Python using import tkinter) Write a GUI program to develop a simple math calculator. The user should be able to enter two numbers, and click one of four buttons to do the +, -, *, or / operations. Then the program will display the result. Note: if the divisor in the / operation is 0, display ‘N/A’ in the result.

Answer 1

Here is code:

from tkinter import *

class MathCalculator:

def __init__(self):

window = Tk()

window.title("Math Calculator")

Label(window, text="Number #1").grid(row=1, column=1, sticky=W)

Label(window, text="Number #2").grid(row=2, column=1, sticky=W)

Label(window, text="Result").grid(row=3, column=1, sticky=W)

self.num1 = StringVar()

Entry(window, textvariable=self.num1,

justify=RIGHT).grid(row=1, column=5)

self.num2 = StringVar()

Entry(window, textvariable=self.num2,

justify=RIGHT).grid(row=2, column=5)

self.result = StringVar()

Entry(window, textvariable=self.result,

justify=RIGHT).grid(row=3, column=5)

btAdd = Button(window, text="+",

command=self.computeAdd).grid(row=4, column=1, sticky=E)

btSub = Button(window, text="-",

command=self.computeSub).grid(row=4, column=2, sticky=E)

btDiv = Button(window, text="/",

command=self.computeDiv).grid(row=4, column=3, sticky=E)

btMul = Button(window, text="*",

command=self.computeMul).grid(row=4, column=4, sticky=E)

window.mainloop()

def computeAdd(self):

output = int(self.num1.get()) + int(self.num2.get())

self.result.set(format(output, ".2f"))

def computeSub(self):

output = int(self.num1.get()) - int(self.num2.get())

self.result.set(format(output, ".2f"))

def computeDiv(self):

if(int(self.num2.get()) == 0):

self.result.set("N/A")

else:

output = int(self.num1.get()) / int(self.num2.get())

self.result.set(format(output, ".2f"))

def computeMul(self):

output = int(self.num1.get()) * int(self.num2.get())

self.result.set(format(output, ".2f"))

def main():

MathCalculator()

main()

Output: