BCA Slip6 Java

Java

Slip6

Q.1) Create a calculator with functionality in an Applet. [Marks 30]

Solution

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class Slip6  extends Applet implements ActionListener

{

      String msg=" ";

      int v1,v2,result;

      TextField t;

      Button b[]=new Button[10];

      Button add,sub,mul,div,clear,equals;

      char choice;

      Panel p,p1;

      public void init()

      {

            setLayout(new BorderLayout());

             p =new Panel();

            t=new TextField(20);

            p.add(t);

            p1=new Panel();

            p1.setLayout(new GridLayout(5,4));

            for(int i=0;i<10 i="" span="">

            {

                  b[i]=new Button(""+i);

            }

            equals=new Button("=");

            add=new Button("+");

            sub=new Button("-");

            mul=new Button("*");

            div=new Button("/");

            clear=new Button("C");

            for(int i=0;i<10 i="" span="">

            {

                  p1.add(b[i]);

            }

            p1.add(equals);

            p1.add(add);

            p1.add(sub);

            p1.add(mul);

            p1.add(div);

            p1.add(clear);

            for(int i=0;i<10 i="" span="">

            {

                  b[i].addActionListener(this);

            }

            add.addActionListener(this);

            sub.addActionListener(this);

            mul.addActionListener(this);

            div.addActionListener(this);

            clear.addActionListener(this);

            equals.addActionListener(this);

            add(p,BorderLayout.NORTH);

            add(p1);

      }

      public void actionPerformed(ActionEvent ae)

      {

            String str = ae.getActionCommand();

            char ch = str.charAt(0);

            if ( Character.isDigit(ch))

            t.setText(t.getText()+str);

            else

            if(str.equals("+"))

            {

                 v1=Integer.parseInt(t.getText());

                  choice='+';

                  t.setText("");

            }

            else if(str.equals("-"))

            {

                 v1=Integer.parseInt(t.getText());

                  choice='-';

                  t.setText("");

            }

            else if(str.equals("*"))

            {

                  v1=Integer.parseInt(t.getText());

                  choice='*';

                  t.setText("");

            }

            else if(str.equals("/"))

            {

                  v1=Integer.parseInt(t.getText());

                  choice='/';

                  t.setText("");

            }

          

            if(str.equals("="))

            {

                  v2=Integer.parseInt(t.getText());

                  if(choice=='+')

                        result=v1+v2;

                  else if(choice=='-')

                        result=v1-v2;

                  else if(choice=='*')

                        result=v1*v2;

                  else if(choice=='/')

                        result=v1/v2;

                

                  t.setText(""+result);

            }   

            if(str.equals("C"))

            {

                  t.setText("");

            }

      }

}