Calculator in java (C++ Learning Community)

Title: Calculator in java
Description: In the making

kccc - November 21, 2006 09:35 PM (GMT)

I'm currently working on a calculator in my primary programming language, Java. I started it off as a command prompt and now I'm including GUI.

CODE

import java.util.*;

class calc1001 {
public static void main (String[] args) {
Scanner scan = new Scanner (System.in);
double inputX;
double inputY;
double solution = 0.0;
char inputLetter = 'q';
String inputString;

for (int i = 0; i < 1;) {
System.out.println ("\na... Addition\ns... Subtraction/Sqareroot\nm... Multiplication\nd... Division\nh... Hypotenuse\nl... Logarithm(base ten)\n");

System.out.print ("Enter first number: ");
inputX = scan.nextDouble();

System.out.print ("Enter second number (enter zero if none): ");
inputY = scan.nextDouble();

System.out.print ("Enter corresponding letter: ");
inputString = scan.next().trim();
inputLetter = inputString.charAt(0);

switch (inputLetter) {
case 'a':
solution = inputX + inputY;
break;
case 's':
if (inputY != 0)
solution = inputX - inputY;
else
solution = Math.sqrt(inputX);
break;
case 'm':
solution = inputX * inputY;
break;
case 'd':
solution = inputX / inputY;
break;
case 'h':
solution = Math.hypot(inputX, inputY);
break;
case 'l':
solution = Math.log10(inputX);
break;
case 'q':
i = 1;
break;
default:
solution = 0;
String outputA = "\nThe operation entered was not recognized.";
System.out.println (outputA);
break;
}

if (i == 0)
System.out.println ("\nSolution: " + solution + "\n");
}
}
}

kccc - November 25, 2006 06:30 PM (GMT)

Here's where I am so far, tell me any techniques to shorten it up or to improve the code please if you know any:

CODE

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class calc2100 extends JFrame implements ActionListener {
private double storedDouble = 0.0;
private double displayDouble = 0.0;
private int count = 0;
private String operation = " ";
private char opChar = operation.charAt(0);

JTextField display = new JTextField(20);

JLabel padding0 = new JLabel(" ");
JLabel padding1 = new JLabel(" ");
JLabel padding2 = new JLabel(" ");
JLabel padding3 = new JLabel(" ");

JPanel butPanel = new JPanel();
JPanel opPanel = new JPanel();
JPanel numPanel = new JPanel();
JPanel botPanel = new JPanel();

private JButton add = new JButton(" + ");
private JButton sub = new JButton(" - ");
private JButton mul = new JButton(" * ");
private JButton div = new JButton(" / ");
private JButton mod = new JButton("mod");
private JButton hyp = new JButton("hyp");
private JButton log = new JButton("log");
private JButton sqr = new JButton("Sqr");

private JButton one = new JButton(" 1 ");
private JButton two = new JButton(" 2 ");
private JButton thr = new JButton(" 3 ");
private JButton fou = new JButton(" 4 ");
private JButton fiv = new JButton(" 5 ");
private JButton six = new JButton(" 6 ");
private JButton sev = new JButton(" 7 ");
private JButton eig = new JButton(" 8 ");
private JButton nin = new JButton(" 9 ");
private JButton zer = new JButton(" 0 ");
private JButton dot = new JButton(" . ");
private JButton exp = new JButton(" e ");

private JButton clear = new JButton("C/CE");
private JButton equal = new JButton(" = ");
private JButton close = new JButton("Exit");

String displayText = " ";

public calc2100() {

getContentPane().setLayout(new FlowLayout());

getContentPane().add(display);
display.setText("0");
display.setEditable(false);

opPanel.setLayout(new GridLayout(6, 2));
opPanel.add(add);
opPanel.add(sub);
opPanel.add(mul);
opPanel.add(div);
opPanel.add(mod);
opPanel.add(hyp);
opPanel.add(log);
opPanel.add(sqr);
opPanel.add(padding0);
opPanel.add(padding1);
opPanel.add(padding2);
opPanel.add(padding2);

numPanel.setLayout(new GridLayout(6, 2));
numPanel.add(sev);
numPanel.add(eig);
numPanel.add(nin);
numPanel.add(fou);
numPanel.add(fiv);
numPanel.add(six);
numPanel.add(one);
numPanel.add(two);
numPanel.add(thr);
numPanel.add(zer);
numPanel.add(dot);
numPanel.add(exp);

botPanel.setLayout(new GridLayout(0, 3));
botPanel.add(clear);
botPanel.add(equal);
botPanel.add(close);

butPanel.setLayout(new BoxLayout(butPanel, BoxLayout.X_AXIS));
butPanel.add(opPanel);
butPanel.add(numPanel);

getContentPane().add(display);
getContentPane().add(butPanel);
getContentPane().add(botPanel);

add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
mod.addActionListener(this);
hyp.addActionListener(this);
log.addActionListener(this);
sqr.addActionListener(this);

zer.addActionListener(this);
one.addActionListener(this);
two.addActionListener(this);
thr.addActionListener(this);
fou.addActionListener(this);
fiv.addActionListener(this);
six.addActionListener(this);
sev.addActionListener(this);
eig.addActionListener(this);
nin.addActionListener(this);
dot.addActionListener(this);
exp.addActionListener(this);

clear.addActionListener(this);
equal.addActionListener(this);
close.addActionListener(this);

setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}

void writeTo (String term) {
String original = display.getText();
String newString = original + term;
display.setText(newString);
displayDouble = Double.parseDouble(term);
}

private void add() {
if (count == 0) {
opChar = 'a';
storedDouble = displayDouble;
clear();
count++;
}
else {
displayText = (displayDouble + storedDouble) + " ";
display.setText(displayText);
count--;
}
}

private void sub() {
if (count == 0) {
opChar = 's';
storedDouble = displayDouble;
clear();
count++;
}
else {
displayText = (displayDouble - storedDouble)+ " ";
display.setText(displayText);
count--;
}
}

private void mul() {
if (count == 0) {
opChar = 'm';
storedDouble = displayDouble;
clear();
count++;
}
else {
displayText = (displayDouble * storedDouble)+ " ";
display.setText(displayText);
count--;
}
}

private void div() {
if (count == 0) {
opChar = 'd';
storedDouble = displayDouble;
clear();
count++;
}
else {
displayText = (displayDouble / storedDouble)+ " ";
display.setText(displayText);
count--;
}

}

private void mod() {
if (count == 0) {
opChar = 'i';
storedDouble = displayDouble;
clear();
count++;
}

else {
displayText = (displayDouble % storedDouble)+ " ";
display.setText(displayText);
count--;
}

}

private void hyp() {
if (count == 0) {
opChar = 'h';
storedDouble = displayDouble;
clear();
count++;
}

else {
displayText = (Math.hypot(displayDouble, storedDouble))+ " ";
display.setText(displayText);
count--;
}
}

private void log() {
displayText = Math.log10(displayDouble)+ " ";
display.setText(displayText);
}

private void sqr() {
displayText = Math.sqrt(displayDouble)+ " ";
display.setText(displayText);
}

private void clear() {
display.setText(" ");
opChar = ' ';
}

private void equal() {
count = 1;

switch (opChar) {
case 'a':
add();
break;
case 's':
sub();
break;
case 'm':
mul();
break;
case 'd':
div();
break;
case 'i':
mod();
break;
case 'h':
hyp();
break;
default:
clear();
break;
}
}

public void actionPerformed (ActionEvent e) {
if (e.getSource() == add)
add();
if (e.getSource() == sub)
sub();
if (e.getSource() == mul)
mul();
if (e.getSource() == div)
div();
if (e.getSource() == mod)
mod();
if (e.getSource() == hyp)
hyp();
if (e.getSource() == log)
log();
if (e.getSource() == sqr)
sqr();
if (e.getSource() == one)
writeTo("1");
if (e.getSource() == two)
writeTo("2");
if (e.getSource() == thr)
writeTo("3");
if (e.getSource() == fou)
writeTo("4");
if (e.getSource() == fiv)
writeTo("5");
if (e.getSource() == six)
writeTo("6");
if (e.getSource() == sev)
writeTo("7");
if (e.getSource() == eig)
writeTo("8");
if (e.getSource() == nin)
writeTo("9");
if (e.getSource() == zer)
writeTo("0");
if (e.getSource() == dot)
writeTo(".");
if (e.getSource() == exp)
writeTo("e");
if (e.getSource() == clear)
clear();
if (e.getSource() == equal)
equal();
if (e.getSource() == close)
System.exit(0);
}
public static void main (String[] args) {
calc2100 newCalc = new calc2100();
newCalc.setSize(270, 295);
newCalc.setVisible(true);
newCalc.setTitle("Calculator");
}
}

Edit - improved

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