Import java. Awt. *;
import java.awt.event. *;
public class Calculadora extends Frame
{
Button bn[]=new Button[10];
Button bn2[]=new Button[4];
Button igual=new Button("=");
TextField txt1=new TextField();
int num1=0;
char ope;
public Calculadora()
{
setLayout(new FlowLayout());
int i=0;
for (i=0;i<bn. length="">
{
bn[i]=new Button(String. ValueOf(i+1));
bn[i]. AddActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
escribirNumero(e);
}
});
add(bn[i]);
}
for (i=0;i<bn2. length="">
{
bn2[i]=new Button();
switch(i)
{
case 0:
bn2[i]. SetLabel("+");
break;
case 1:
bn2[i]. SetLabel("*");
break;
case 2:
bn2[i]. SetLabel("-");
break;
case 3:
bn2[i]. SetLabel("/");
break;
}
bn2[i]. AddActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
almacenarOperador(e);
}
});
add(bn2[i]);
}
igual. AddActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
mostrarResultado(e);
}
});
add(igual);
add(txt1);
}
public void escribirNumero(ActionEvent e)
{
Button boton=(Button)(e. GetSource());
txt1. SetText(txt1. GetText()+boton. GetLabel());
}
public void almacenarOperador(ActionEvent e)
{
Button boton=(Button)(e. GetSource());
ope=boton. GetLabel(). CharAt(0);
num1=Integer. ParseInt(txt1. GetText());
txt1. SetText("");
}
public void mostrarResultado(ActionEvent e)
{
int num2=Integer. ParseInt(txt1. GetText());
int res=0;
switch (ope)
{
case '+':
res=num1+num2;
break;
case '-':
res=num1-num2;
break;
case '*':
res=num1*num2;
break;
case '/':
res=num1/num2;
break;
}
txt1. SetText(String. ValueOf(res));
}
public static void main (String args[])
{
Calculadora c=new Calculadora();
c. SetVisible(true);
}
}