i made a binary calculator... it calculates two numbers in binary code
i'm new in programming so this is what i came up with, it's not the best implementation, but it might help someone
known bugs: when u try to make more calculations in one "session" it doesn't clear the variables(i don't know why) so it gives wrong answers
public class Calculator extends JFrame implements ActionListener {
public static JButton b[] = new JButton[10];
public static JButton plus, minus, prod, clear, div, equal;
public static JTextArea text;
public static FlowLayout layout;
public static JFrame frame;
public static String binaryNumber, newNo, oldNo;
public static String fieldText;
public static void main(String args[]) {
for (int i = 0; i < 10; i++) {
b[i] = new JButton("" + i + "");
}
plus = new JButton("+");
minus = new JButton("-");
prod = new JButton("*");
div = new JButton("/");
equal = new JButton("=");
clear = new JButton("C");
text = new JTextArea(1, 15);
frame = new JFrame("Calculator");
JFrame.setDefaultLookAndFeelDecorated(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container container = frame.getContentPane();
container.setLayout(new FlowLayout());
container.add(text);
for (int i = 0; i < 10; i++) {
container.add(b[i]);
}
container.add(plus);
container.add(minus);
container.add(div);
container.add(prod);
container.add(equal);
container.add(clear);
frame.setSize(200, 180);
frame.setResizable(false);
frame.setVisible(true);
//when the button is pressed it prints in the textArea the number in binary code
b[0].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String sum;
if (e.getSource() == b[0])
binaryNumber = Integer.toBinaryString(0); //1,2,3.. for each number
fieldText = text.getText();
if (fieldText == null || fieldText.equals("")) {
text.setText(binaryNumber);
} else {
sum = addBinary(fieldText, binaryNumber);
text.setText(sum);
}
}
});
`// same ActionListener, for each number
b[9].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String sum;
if (e.getSource() == b[9])
binaryNumber = Integer.toBinaryString(9);
fieldText = text.getText();
if (fieldText == null || fieldText.equals("")) {
text.setText(binaryNumber);
} else {
sum = addBinary(fieldText, binaryNumber);
text.setText(sum);
}
}
});
//when the plus button is pressed the first given number is stored in a variable
// and it waits for the next number
//it calculates the result when '='button is pressed
plus.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == plus)
oldNo = text.getText();
text.setText("");
System.out.println("old " + oldNo);
equal.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == equal) {
//takes the second number
newNo = text.getText();
//call the function to calculate the two numbers
binaryNumber = plus(newNo, oldNo); // call the function for minus and the rest
text.setText(binaryNumber);
//for debugging
System.out.println("old " + oldNo);
System.out.println("new " + newNo);
int t = 0;
t = Integer.parseInt(binaryNumber, 2);
System.out.println("sum " + binaryNumber);
System.out.println("sum " + t);
}
}
});
}
});
// same.. ActionListener for each operation
//clears the textArea
clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == clear)
text.setText("");
binaryNumber = null;
newNo = null;
oldNo = null;
}
});
}
// method to add two binary numbers
// gets 2 strings, convert them to decimal
// from decimal glue the two numbers in a string
// then from the glued string to int
// finally, from int to binary
public static String addBinary(String no1, String no2) {
Integer sum = 0, var1 = 0, var2 = 0;
String result = null, sumInInt = null;
var1 = Integer.parseInt(no1, 2);
var2 = Integer.parseInt(no2, 2);
sumInInt = var1.toString() + var2.toString();
sum = Integer.parseInt(sumInInt);
result = Integer.toBinaryString(sum);
/*
* System.out.println("stringToInt1 " + stringToInt1);
* System.out.println("var1 " + var1);
* System.out.println("var2 " + var2);
* System.out.println("sumInInt " + sumInInt);
* System.out.println("sum " + sum);
* System.out.println("result " + result);
*/
return result;
}
//same logic as 'addBinary' but calculates the sum of two numbers
public static String produs(String no1, String no2) {
Integer sum = 0, var1 = 0, var2 = 0;
String result = null;
var1 = Integer.parseInt(no1, 2);
var2 = Integer.parseInt(no2, 2);
sum = var1 * var2; // sum = var1 [+,-,/] var2; ... for each operation
result = Integer.toBinaryString(sum);
return result;
}
@Override
public void actionPerformed(ActionEvent e) {
}
}i didn't post the whole code because is too long:P