Code: Select all
<applet code=TriCon width=640 height=160>
</applet>
TriCon.javaCode: Select all
// TriCon.java - Alexander Shabarshin 08-Feb-2006
// See http://ternary.info
import java.applet.*;
import java.awt.*;
public class TriCon extends Applet
{
TextField text2;
TextField text3;
TextField text10;
TextField text16;
int number;
public void init()
{
setLayout(new GridLayout(4,2));
add(new Label("Ternary (N,O,P):"));
text3 = new TextField(24);
add(text3);
add(new Label("Decimal (0-9):"));
text10 = new TextField(16);
add(text10);
add(new Label("Hexadecimal (0-9,A-F):"));
text16 = new TextField(8);
add(text16);
add(new Label("Binary (0,1):"));
text2 = new TextField(32);
add(text2);
}
public boolean action(Event event, Object object)
{
if(text2.equals((TextField)event.target))
{
number = Integer.parseInt(text2.getText(),2);
text3.setText(toTernary(number));
text10.setText(Integer.toString(number));
text16.setText(Integer.toHexString(number).toUpperCase());
}
if(text3.equals((TextField)event.target))
{
number = fromTernary(text3.getText());
text2.setText(Integer.toBinaryString(number));
text10.setText(Integer.toString(number));
text16.setText(Integer.toHexString(number).toUpperCase());
}
if(text10.equals((TextField)event.target))
{
number = Integer.parseInt(text10.getText(),10);
text2.setText(Integer.toBinaryString(number));
text3.setText(toTernary(number));
text16.setText(Integer.toHexString(number).toUpperCase());
}
if(text16.equals((TextField)event.target))
{
number = Integer.parseInt(text16.getText(),16);
text2.setText(Integer.toBinaryString(number));
text3.setText(toTernary(number));
text10.setText(Integer.toString(number));
}
return true;
}
public static String toTernary(int num)
{
int n,m,k;
String s = null;
k = 387420489;
for(int i=0;i<=18;i++)
{
n = num/k;
num -= n*k;
m = k/2;
if(num>+m){n++;num-=k;}
if(num<-m){n--;num+=k;}
if(n!=0 && s==null) s="";
if(n==-1) s+="N";
if(n==0 && s!=null) s+="O";
if(n==1) s+="P";
k /= 3;
}
return s;
}
public static int fromTernary(String s)
{
int n = 0;
int k = 1;
for(int i=s.length()-1;i>=0;i--)
{
char c = s.charAt(i);
if(c!='N'&&c!='O'&&c!='P') return 0;
if(c=='N') n-=k;
if(c=='P') n+=k;
k *= 3;
}
return n;
}
}
