/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/GUIForms/JFrame.java to edit this template
 */
package Java_Calc;

/**
 * This class represents a simple calculator GUI.
 */
public class Java_Cal extends javax.swing.JFrame {
    double firstnum; // Stores the first operand
    double secondnum; // Stores the second operand
    double result; // Stores the result of the operation
    String operations; // Stores the current operation
    String answer; // Stores the final answer

    /**
     * Creates new form Java_Cal
     */
    public Java_Cal() {
        initComponents(); // Initializes the GUI components
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
        // GUI components initialization code
        // ...
    }                                        

    // ActionPerformed method for backspace button
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        String backspace=null;
        
        if(jtxtDisplay.getText().length() > 0){
        StringBuilder strB =new StringBuilder(jtxtDisplay.getText());
        strB.deleteCharAt(jtxtDisplay.getText().length() - 1);
        backspace = strB.toString();
        jtxtDisplay.setText(backspace);
        }
    }                                        

    // ActionPerformed method for clear button
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        jtxtDisplay.setText("");
    }                                        

    // ActionPerformed methods for number buttons
    private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        String Enternumber = jtxtDisplay.getText() + jButton5.getText();
        jtxtDisplay.setText(Enternumber);
    }                                        

    // ActionPerformed methods for other number buttons...
    // ...

    // ActionPerformed method for percentage button
    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        firstnum = Double.parseDouble(jtxtDisplay.getText());
        jtxtDisplay.setText("");
        operations = "%";
    }                                        

    // ActionPerformed method for division button
    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        firstnum = Double.parseDouble(jtxtDisplay.getText());
        jtxtDisplay.setText("");
        operations = "/";
    }                                        

    // ActionPerformed method for multiplication button
    private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        firstnum = Double.parseDouble(jtxtDisplay.getText());
        jtxtDisplay.setText("");
        operations = "*";
    }                                        

    // ActionPerformed method for subtraction button
    private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        firstnum = Double.parseDouble(jtxtDisplay.getText());
        jtxtDisplay.setText("");
        operations = "-";
    }                                        

    // ActionPerformed method for addition button
    private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {                                          
        firstnum = Double.parseDouble(jtxtDisplay.getText());
        jtxtDisplay.setText("+");
        operations = "+";
    }                                         

    // ActionPerformed method for positive/negative toggle button
    private void jButton19ActionPerformed(java.awt.event.ActionEvent evt) {                                          
        double ops = Double.parseDouble(String.valueOf(jtxtDisplay.getText()));
        ops =ops * (-1);
        jtxtDisplay.setText(String.valueOf(ops));
    }                                         

    // ActionPerformed method for equals button
    private void jButton20ActionPerformed(java.awt.event.ActionEvent evt) {                                          
        String answer;
        secondnum = Double.parseDouble(jtxtDisplay.getText());
        if (operations == "+")
        {
            result = firstnum + secondnum;
            answer = String.format("%.0f",result);
            jtxtDisplay.setText(answer);
            
        }
        else if (operations == "-")
        {
            result = firstnum - secondnum;
            answer = String.format("%.0f",result);
            jtxtDisplay.setText(answer);          
        }
        
        else if (operations == "*")
        {
            result = firstnum * secondnum;
            answer = String.format("%.0f",result);
            jtxtDisplay.setText(answer) ;   
        }
        
        else if (operations == "/")
        {
            result = firstnum / secondnum;
            answer = String.format("%.0f",result);
            jtxtDisplay.setText(answer); 
        }
        
        else if (operations == "%")
        {
            result = firstnum % secondnum;
            answer = String.format("%.0f",result);
            jtxtDisplay.setText(answer);
            
        }
    }                                         

    // ActionPerformed method for decimal point button
    private void jButton18ActionPerformed(java.awt.event.ActionEvent evt) {                                          
        String Enternumber = jtxtDisplay.getText() + jButton18.getText();
        jtxtDisplay.setText(Enternumber);
    }                                         

    // ActionPerformed method for zero button
    private void jButton17ActionPerformed(java.awt.event.ActionEvent evt) {                                          
        String Enternumber = jtxtDisplay.getText() + jButton17.getText();
        jtxtDisplay.setText(Enternumber);
    }                                         

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Java_Cal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Java_Cal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Java_Cal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Java_Cal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Java_Cal().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    // Variables for other buttons...
    // ...
    private javax.swing.JTextField jtxtDisplay;
    // End of variables declaration                   
}