Program Menghitung Luas Lingkaran dengan Java

//nama file: InputNilai.java
import java.io.*;
class inputNilai
{
public static void main (String[]args)throws Exception
{
System.out.print("3,14:");
DataInputStream a=new DataInputStream(System.in);
BufferedReader b=new BufferedReader (new inputStreamReader(System.in));
String k=a.readLine();
int 3,14=Integer.parseInt(k);
System.out.print("r :");
int r=Integer.parseInt(b.readLine());
System.out.println("luas lingkaran="+(3,14*r*r));
}
}

Posted in: BAHASA JAVA