Progam Sederhana Biner ke Desimal

Setelah kemarin sudah memposting Program Konversi Desimal ke Biner, sekarang program Biner ke Desimal menggunakan Java.

package tugasalpro1;
import java.util.Scanner;

/*
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/**
 *
 * @author moko
 */
public class binertodesimal {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        //inisialisai
        int biner, i = 0, cek = 0;
        long nilai = 0;
        
        biner = input.nextInt();
        
        
        //mencari 2 pangkat n
        do{
            if(biner - (i * Math.pow(10, i)) >= 0){
           
            cek = cek+1;
        }
            i++;
            
        }while(i <= biner);

        
        
        for (int j = cek; j >= 0; j--) {
            // n = biner - 10 pangkat j
            int n = (int) (biner - Math.pow(10,j));
            // k = 10 pangkat j
            int k = (int) Math.pow(10, j);
           
            
            if(n >= 0){
                
            nilai = (int) (nilai + Math.pow(2, j));
            biner = biner - k;
            }
            
        }
        System.out.println(nilai);
    }
    
}

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