java program on caculator Calculator(applet programming)

java program on caculator Calculator(applet programming)

Save as Cal.java

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

/*

<applet code="Cal" width=300 height=300>

</applet>

*/

public class Cal extends Applet

implements ActionListener

{

String msg=" ";

int v1,v2,result;

TextField t1;

Button b[]=new Button[10];

Button add,sub,mul,div,clear,mod,EQ;

char OP;

public void init()

{

Color k=new Color(120,89,90);

setBackground(k);

t1=new TextField(10);

GridLayout gl=new GridLayout(4,5);

setLayout(gl);

for(int i=0;i<10;i++)

{

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

}

add=new Button("add");

sub=new Button("sub");

mul=new Button("mul");

div=new Button("div");

mod=new Button("mod");

clear=new Button("clear");

EQ=new Button("EQ");

t1.addActionListener(this);

add(t1);

for(int i=0;i<10;i++)

{

add(b[i]);

}

add(add);

add(sub);

add(mul);

add(div);

add(mod);

add(clear);

add(EQ);

for(int i=0;i<10;i++)

{

b[i].addActionListener(this);

}

add.addActionListener(this);

sub.addActionListener(this);

mul.addActionListener(this);

div.addActionListener(this);

mod.addActionListener(this);

clear.addActionListener(this);

EQ.addActionListener(this);

}

public void actionPerformed(ActionEvent ae)

{

String str=ae.getActionCommand();

char ch=str.charAt(0);

if ( Character.isDigit(ch))

t1.setText(t1.getText()+str);

else

if(str.equals("add"))

{

v1=Integer.parseInt(t1.getText());

OP='+';

t1.setText("");

}

else if(str.equals("sub"))

{

v1=Integer.parseInt(t1.getText());

OP='-';

t1.setText("");

}

else if(str.equals("mul"))

{

v1=Integer.parseInt(t1.getText());

OP='*';

t1.setText("");

}

else if(str.equals("div"))

{

v1=Integer.parseInt(t1.getText());

OP='/';

t1.setText("");

}

else if(str.equals("mod"))

{

v1=Integer.parseInt(t1.getText());

OP='%';

t1.setText("");

}

if(str.equals("EQ"))

{

v2=Integer.parseInt(t1.getText());

if(OP=='+')

result=v1+v2;

else if(OP=='-')

result=v1-v2;

else if(OP=='*')

result=v1*v2;

else if(OP=='/')

result=v1/v2;

else if(OP=='%')

result=v1%v2;

t1.setText(""+result);

}         

if(str.equals("clear"))

{

t1.setText("");

}

}

}