# Python program to create a simple GUI
# calculator using Tkinter
# importál mindent a tkinter modulból
from tkinter import *
# globálisan deklarálja a kifejezés változót
expression = ""
# Funkció a kifejezés frissítésére
# a szövegbeviteli mezőben
def press(num):
# rámutat a globális kifejezés változóra
global expression
# karakterlánc összefűzése
expression = expression + str(num)
# update the expression by using set method
equation.set(expression)
# Function to evaluate the final expression
def equalpress():
# Try and except statement is used
# for handling the errors like zero
# division error etc.
# Put that code inside the try block
# which may generate the error
try:
global expression
# eval function evaluate the expression
# and str function convert the result
# into string
total = str(eval(expression))
equation.set(total)
# initialze the expression variable
# by empty string
expression = ""
# if error is generate then handle
# by the except block
except:
equation.set(" error ")
expression = ""
# Function to clear the contents
# of text entry box
def clear():
global expression
expression = ""
equation.set("")
# Driver code
if __name__ == "__main__":
# create a GUI window
gui = Tk()
# set the background colour of GUI window
gui.configure(background="light green")
# set the title of GUI window
gui.title("Simple Calculator")
# set the configuration of GUI window
gui.geometry("270x150")
# StringVar() is the variable class
# we create an instance of this class
equation = StringVar()
# create the text entry box for
# showing the expression .
expression_field = Entry(gui, textvariable=equation)
# grid method is used for placing
# the widgets at respective positions
# in table like structure .
expression_field.grid(columnspan=4, ipadx=70)
equation.set('enter your expression')
# create a Buttons and place at a particular
# location inside the root window .
# when user press the button, the command or
# function affiliated to that button is executed .
button1 = Button(gui, text=' 1 ', fg='black', bg='red',
command=lambda: press(1), height=1, width=7)
button1.grid(row=2, column=0)
button2 = Button(gui, text=' 2 ', fg='black', bg='red',
command=lambda: press(2), height=1, width=7)
button2.grid(row=2, column=1)
button3 = Button(gui, text=' 3 ', fg='black', bg='red',
command=lambda: press(3), height=1, width=7)
button3.grid(row=2, column=2)
button4 = Button(gui, text=' 4 ', fg='black', bg='red',
command=lambda: press(4), height=1, width=7)
button4.grid(row=3, column=0)
button5 = Button(gui, text=' 5 ', fg='black', bg='red',
command=lambda: press(5), height=1, width=7)
button5.grid(row=3, column=1)
button6 = Button(gui, text=' 6 ', fg='black', bg='red',
command=lambda: press(6), height=1, width=7)
button6.grid(row=3, column=2)
button7 = Button(gui, text=' 7 ', fg='black', bg='red',
command=lambda: press(7), height=1, width=7)
button7.grid(row=4, column=0)
button8 = Button(gui, text=' 8 ', fg='black', bg='red',
command=lambda: press(8), height=1, width=7)
button8.grid(row=4, column=1)
button9 = Button(gui, text=' 9 ', fg='black', bg='red',
command=lambda: press(9), height=1, width=7)
button9.grid(row=4, column=2)
button0 = Button(gui, text=' 0 ', fg='black', bg='red',
command=lambda: press(0), height=1, width=7)
button0.grid(row=5, column=0)
plus = Button(gui, text=' + ', fg='black', bg='red',
command=lambda: press("+"), height=1, width=7)
plus.grid(row=2, column=3)
minus = Button(gui, text=' - ', fg='black', bg='red',
command=lambda: press("-"), height=1, width=7)
minus.grid(row=3, column=3)
multiply = Button(gui, text=' * ', fg='black', bg='red',
command=lambda: press("*"), height=1, width=7)
multiply.grid(row=4, column=3)
divide = Button(gui, text=' / ', fg='black', bg='red',
command=lambda: press("/"), height=1, width=7)
divide.grid(row=5, column=3)
equal = Button(gui, text=' = ', fg='black', bg='red',
command=equalpress, height=1, width=7)
equal.grid(row=5, column=2)
clear = Button(gui, text='Clear', fg='black', bg='red',
command=clear, height=1, width=7)
clear.grid(row=5, column='1')
Decimal= Button(gui, text='.', fg='black', bg='red',
command=lambda: press('.'), height=1, width=7)
Decimal.grid(row=6, column=0)
# start the GUI
gui.mainloop()
----------------
Java programozási nyelven
package ptunes;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
//import java.util.ActionEvent;
public class gui implements ActionListener {
public gui() {
}
public void actionPerformed (ActionEvent ae ){
// JOptionPane.showMessageDialog(ìHello is pressedî);
}
public static void main(String[] args) {
JFrame j = new JFrame("Buttons");
Container c = j.getContentPane();
//c.setLayout(new BorderLayout());
JPanel p1 = new JPanel();
p1.setLayout(new BorderLayout());
p1.setLayout(new GridLayout(4,4,4,4));
final JTextField t = new JTextField(100);
Font myFontSize = t.getFont().deriveFont(Font.BOLD,50f);
t.setFont(myFontSize);
c.add(t,BorderLayout.NORTH);
final JButton n1 = new JButton("1");
n1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n1.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n2 = new JButton("2");
n2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n2.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n3 = new JButton("3");
n3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n3.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n4 = new JButton("4");
n4.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n4.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n5 = new JButton("5");
n5.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n5.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n6 = new JButton("6");
n6.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n6.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n7 = new JButton("7");
n7.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n7.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n8 = new JButton("8");
n8.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n8.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n9 = new JButton("9");
n9.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n9.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n10 = new JButton("0");
n10.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n10.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n11 = new JButton("+");
n11.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n11.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n12 = new JButton("-");
n12.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n12.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n13 = new JButton("*");
n13.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n13.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n14 = new JButton("/");
n14.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n14.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n15 = new JButton("=");
n15.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
//String num1 = n15.getText();
String global = t.getText();
//global = global.concat(num1);
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("JavaScript");
try {
String s = engine.eval(global).toString();
t.setText(s);
} catch (ScriptException e1) {
e1.printStackTrace();
}
}
});
final JButton n16 = new JButton("C");
n16.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
//String num1 = n16.getText();
String global = t.getText();
global = null;
t.setText(global);
}
});
p1.add(n1);
p1.add(n2);
p1.add(n3);
p1.add(n4);
p1.add(n5);
p1.add(n6);
p1.add(n7);
p1.add(n8);
p1.add(n9);
p1.add(n10);
p1.add(n11);
p1.add(n12);
p1.add(n13);
p1.add(n14);
p1.add(n15);
p1.add(n16);
c.add(p1,BorderLayout.CENTER);
j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
j.setSize(400,400);
j.setVisible(true);
}
}
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