1. JAVA WEEK7
/*
Week 7 :
Write a Java program that works as a simple calculator.
Use a grid layout to arrange buttons for the digits and
for the +, -,*, % operations. Add a text field to display
the result.
*/
import java.awt.event.*;
import java.applet.Applet;
import java.awt.*;
/*
< applet code= LabPro14 Width=300 Height=300 >
< /applet >
*/
public class LabPro14 extends Applet implements ActionListener
{
TextField t;String a;int p=0,tmp=0;
Button bo,b1,b2,b3,b4,b5,b6,b7,b8,b9;
Button badd,bsub,bmul,bdiv,bper,beql,bc;
public void init()
{
t = new TextField(50);
bo = new Button("0");
b1 = new Button("1");
b2 = new Button("2");
b3 = new Button("3");
b4 = new Button("4");
b5 = new Button("5");
b6 = new Button("6");
b7 = new Button("7");
b8 = new Button("8");
b9 = new Button("9");
badd = new Button("+");
bsub = new Button("-");
bmul = new Button("*");
bdiv = new Button("/");
bper = new Button("%");
bc = new Button("c");
beql = new Button("=");
add(t);add(bo);add(b1);
add(b2);add(b3);add(b4);
add(b5);add(b6);add(b7);
add(b8);add(b9);add(badd);
add(bsub);add(bmul);add(bdiv);
add(bper);add(bc);add(beql);
bo.addActionListener(this);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
badd.addActionListener(this);
bsub.addActionListener(this);
bmul.addActionListener(this);
bdiv.addActionListener(this);
bper.addActionListener(this);
Page 1

2. JAVA WEEK7
bc.addActionListener(this);
beql.addActionListener(this);
//setLayout(new GridLayout(4,4));
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==bc)
{
t.setText("0");
}
if(ae.getSource()==bo)
{
int k=Integer.parseInt(t.getText());
k=k*10+0;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b1)
{
int k=Integer.parseInt(t.getText());
k=k*10+1;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b2)
{
int k=Integer.parseInt(t.getText());
k=k*10+2;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b3)
{
int k=Integer.parseInt(t.getText());
k=k*10+3;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b4)
{
int k=Integer.parseInt(t.getText());
k=k*10+4;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b5)
{
int k=Integer.parseInt(t.getText());
k=k*10+5;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b6)
{
int k=Integer.parseInt(t.getText());
k=k*10+6;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b7)
{
int k=Integer.parseInt(t.getText());
k=k*10+7;
t.setText(String.valueOf(k));
}
if(ae.getSource()==b8)
{
int k=Integer.parseInt(t.getText());
k=k*10+8;
t.setText(String.valueOf(k));
Page 2

3. JAVA WEEK7
}
if(ae.getSource()==b9)
{
int k=Integer.parseInt(t.getText());
k=k*10+9;
t.setText(String.valueOf(k));
}
if(ae.getSource()==badd)
{
tmp=Integer.parseInt(t.getText());
p=1;
t.setText("0");
}
if(ae.getSource()==bsub)
{
tmp=Integer.parseInt(t.getText());
p=2;
t.setText("0");
}
if(ae.getSource()==bmul)
{
tmp=Integer.parseInt(t.getText());
p=3;
t.setText("0");
}
if(ae.getSource()==bdiv)
{
tmp=Integer.parseInt(t.getText());
p=4;
t.setText("0");
}
if(ae.getSource()==bper)
{
tmp=Integer.parseInt(t.getText());
p=5;
t.setText("0");
}
if(ae.getSource()==beql)
{
float newval=Integer.parseInt(t.getText());
float res=0;
switch(p)
{
case 1:
res=tmp+newval;
break;
case 2:
res=tmp-newval;
break;
case 3:
res=tmp*newval;
break;
case 4:
res=tmp/newval;
break;
case 5:
res=tmp%newval;
break;
}
t.setText(String.valueOf(res));
}
}
}
Page 3