import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class calculator extends Applet
{
TextField display;
int saveNum = 0;
int memNum = 0;
char op = ‘=’;
char lastOp = ‘=’;
boolean newNum = true;

public void init ()
{
setBackground(Color.pink);

display = new TextField(”0″, 6);
display = setEditable(false);//
add(display);

Panel p = new Panel ();
p.setLayout(new GridLayout (5, 4));
for (int i = 1; i <= 9; i++)
{
Button num = new Button("" +i);
num.addActionListener(this);
p.add(num);
if(i==3){
Button plus=new Button("+");
plus.addActionListener(this);
p.add(plus);
}
if(i==6){
Button minus=new Button("-");
plus.addActionListener(this);
p.add(minus);
}

Button times = new Button("*");
times.addActionListener(this);
p.add(times);

Button percent = new Button("%");
percent.addActionListener(this);
p.add(percent);

Button zero = new Button("0");
zero.addActionListener(this);
p.add(zero);

Button division = new Button("/");
division.addActionListener(this);
p.add(division);

Button clear = new Button("C");
clear.addActionListener(this);
p.add(clear);

Button equals = new Button("=");
equals.addActionListener(this);
p.add(equals);
add(p);
}

publiic void actionPerformed(ActionEvent evt){
if (evt.getActionCommand() instanceof String){
String s = (String) evt.getActionCommand();
if (s.charAt(0) >= ‘0′ && s.charAt(0) <= ‘9′){
if (newNum)
display.setText(s);
else
display.setText(display.getText() +s);
newNum = false;
}
else{
if (s.charAt(0) == ‘-’ && newNum){
display.setText(”-”);
newNum= false;
}
else {
op=s.charAt(0);
calc(Integer.parseInt(display.getText()));
newNum = true;
}
lastOp=op;
}
}
return;
}

public void calc(int n){
switch(op){
case ‘+’
case ‘-’
case ‘*’
case ‘/’
case ‘%’
saveNum =n;
return;
}

if (op == ‘+’)
op = lastOp;
switch (op){
case ‘+’;
saveNum +=n;
break;

case ‘-’;
saveNum -=n;
break;

case ‘*’;
saveNum *=n;
break;

case ‘/’;
saveNum /=n;
break;

case ‘%’;
saveNum %=n;
break;

case ‘C’;
saveNum =0;
break;
}
display.setText(”" +saveNum);
}
}

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