peraktek

package javaapplication2;
import java.io.*;
class baca
{
    public static String bacaString ()
    {
        int karakter;
        String str="";
        boolean selesai = false;
        while (!selesai)
        {
            try
            {
                karakter = System.in.read ();
                if (karakter<0 || (char) karakter =='\n')
                {
                    selesai = true;
                }
                else if ( (char) karakter !='r')
                {
                    str = str + (char) karakter;
                }
            }
            catch (java.io.IOException e)
            {
                System.err.println("ada kesalahan");
                selesai = true;
            }
        }
        return str;
    }
}
public class Main{
    public static void main(String [] fu){
        System.out.println("masukkan angka pertama ");
        String a = baca.bacaString();
        int awal = Integer.parseInt(a);
        System.out.println("masukkan angka kedua ");
        String b = baca.bacaString();
        int sani = Integer.parseInt(b);
        if (awal>sani){
            System.out.println(awal-sani);
        }
        else if(awal<sani){
            System.out.println(awal+sani);
        }
        else
        {
           System.out.println("angka yang anda masukkan sama");
         }
    }
}