GUI Calculator calculations

Question 1

The issue with your program is that your doing your calculations on doubles, but your parsing the text as ints. Replace Integer.parseInt with Double.parseDouble, and it will do just as you want.

Question 2

/* Simple Calculator full Worked*/

   import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    class Calculator implements ActionListener
    {
    JFrame f;
    JTextField tf;
    JButton num[];
    JButton btNum0;
    JButton btEqual;
    JButton btAdd;
    JButton btSubtract;
    JButton btMultiply;
    JButton btDivide;
    JButton btSolve;
    JButton btClear;
    JButton btDot;
    JButton btExponent;
    double TEMP;
    double SolveTEMP;
    String display="";
    Boolean addBool = false ;
    Boolean subBool = false ;
    Boolean divBool = false ;
    Boolean mulBool = false ;
    Boolean expBool = false ;     
    Calculator(String s)
    {
    String number[]={"1","2","3","4","5","6","7","8","9"};
    int m=0;
    int x[]={30,80,130};
    int y[]={205,155,105};
    f=new JFrame(s);
       try {
          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch(Exception e) {
          System.out.println("Error setting native LAF: " + e);
        }
    JLabel l=new JLabel("Welcome To ZeeCalc Calculator.. :)");
    l.setBounds(30,10,240,40);
    f.add(l);
    tf=new JTextField();
    num=new JButton[number.length];
    tf.setBounds(30,50,240,40);
    f.add(tf);
    tf.setEditable(false);
    for(int j=0;j<x.length;j++)
    {
    for(int i=0;i<y.length;i++)
    {
    if(m<num.length)
    {
    num[m]=new JButton(String.valueOf(m+1));
    num[m].setBounds(x[i],y[j],45,45);
    f.add(num[m]);
    }
    m++;
    }
    }

    btNum0=new JButton("0");
    btNum0.setBounds(30,255,95,45);
    f.add(btNum0);

    btAdd=new JButton("+");
    btAdd.setBounds(180,255,45,45);
    f.add(btAdd);

    btSubtract=new JButton("-");
    btSubtract.setBounds(180,205,45,45);
    f.add(btSubtract);

    btMultiply=new JButton("*");
    btMultiply.setBounds(180,155,45,45);
    f.add(btMultiply);

    btDot=new JButton(".");
    btDot.setBounds(230,155,45,45);
    f.add(btDot);

    btDivide=new JButton("/");
    btDivide.setBounds(180,105,45,45);
    f.add(btDivide);

    btExponent=new JButton("^");
    btExponent.setBounds(230,105,45,45);
    f.add(btExponent);


    btSolve=new JButton("=");
    btSolve.setBounds(230,205,45,95);
    f.add(btSolve);


    btClear=new JButton("C");
    btClear.setBounds(130,255,45,45);
    f.add(btClear);



    m=0;
    for(int i=0;i<x.length;i++)
    {
    for(int j=0;j<y.length;j++)
    {
    if(m<num.length)
    {
    num[m].addActionListener(this);
    }
    m++;
    }
    }
    btNum0.addActionListener(this);
    btAdd.addActionListener(this);
    btSubtract.addActionListener(this);
    btMultiply.addActionListener(this);
    btDivide.addActionListener(this);
    btSolve.addActionListener(new Operations());
    btClear.addActionListener(this);
    btDot.addActionListener(this);
    btExponent.addActionListener(this);
    f.setLayout(null);
    f.setSize(310,360);
    f.setVisible(true);
    f.setResizable(false);
    f.addWindowListener(new WindowAdapter()
                        {
                        public void windowClosing(WindowEvent e)
                        {
                        System.exit(0);
                        }
                        });
    }




    public void actionPerformed(ActionEvent e)
    {

    if(e.getSource()==num[0])
    {
      display = tf.getText();
      tf.setText(display + "1");
    }
    else if(e.getSource()==num[1])
    {
    display = tf.getText();
      tf.setText(display + "2");
    }
    else if(e.getSource()==num[2])
    {
    display = tf.getText();
      tf.setText(display + "3");
    }
    else if(e.getSource()==num[3])
    {
    display = tf.getText();
      tf.setText(display + "4");
    }
    else if(e.getSource()==num[4])
    {
    display = tf.getText();
      tf.setText(display + "5");
    }
    else if(e.getSource()==num[5])
    {
    display = tf.getText();
      tf.setText(display + "6");
    }
    else if(e.getSource()==num[6])
    {
    display = tf.getText();
      tf.setText(display + "7");
    }
    else if(e.getSource()==num[7])
    {
    display = tf.getText();
      tf.setText(display + "8");
    }
    else if(e.getSource()==num[8])
    {
    display = tf.getText();
      tf.setText(display + "9");
    }
    else if(e.getSource()==btNum0)
    {
    display = tf.getText();
      tf.setText(display + "0");
    }

    else if(e.getSource()==btDot)
    {
    String dot=".";
    display=tf.getText();
    tf.setText(display+ ".");
    }

    else if(e.getSource()==btAdd)
    {
    TEMP=Double.parseDouble(tf.getText());
    tf.setText("");
    addBool=true;
    }
    else if(e.getSource()==btSubtract)
    {
    TEMP=Double.parseDouble(tf.getText());
    tf.setText("");
    subBool=true;
    }
    else if(e.getSource()==btMultiply)
    {
    TEMP=Double.parseDouble(tf.getText());
    tf.setText("");
    mulBool=true;
    }

    else if(e.getSource()==btDivide)
    {
    TEMP=Double.parseDouble(tf.getText());
    tf.setText("");
    divBool=true;
    }
    else if(e.getSource()==btExponent)
    {
    TEMP=Double.parseDouble(tf.getText());
    tf.setText("");
    expBool=true;
    }
    else if(e.getSource()==btClear)
    {
    tf.setText(null);
    }

    }

    public static void main(String... r)
    {
    new Calculator("ZeeCalc Calculator");

    }


    class Operations implements ActionListener
    {
    public void actionPerformed(ActionEvent e)
    {
    //double c=1;
    SolveTEMP=Double.parseDouble( tf.getText() );

    if(addBool==true )
    {
    SolveTEMP=SolveTEMP+TEMP;
    }

    else if(subBool==true)
    {
    SolveTEMP=TEMP-SolveTEMP;
    }
    else if(mulBool==true)
    {
    SolveTEMP=SolveTEMP*TEMP;
    }
    else if(divBool==true)
    {
    SolveTEMP=TEMP/SolveTEMP;
    }
    else if(expBool==true)
    {
    double a=TEMP,b=SolveTEMP;
    SolveTEMP=1;
    for(int i=0;i<b;i++)
    {
    SolveTEMP=SolveTEMP*TEMP;
    }
    }
    tf.setText(Double.toString(SolveTEMP));

    addBool = false ;
    subBool = false ;
    mulBool = false ;
    divBool = false ;
    expBool = false ;
    }

    }

    }