Binary number to decimal

Question

Hi
I realy need help with my java program because something is built wrong and is does not working properly.
I attached my program:
import java.util.Scanner;
import java.lang.*;
public class BinaryToDecimal {
public static void main (String [] args) {
String a;
int b;
double sum;
Scanner reader=new Scanner(System.in);
System.out.println("Enter a binary String: \t");
String binary=reader.nextLine();
sum = 0;
for (int i = 0; i < binary.length(); i++) {
a = Character.toString(binary.charAt(binary.length() - i -1));
sum = sum + Integer.parseInt(a) * Math.pow(2, i);
System.out.println(sum);
If somebody can check this because the output is wrong

Answer 1

1) When you post code, use the CODE button or [code and [/code] tags.
2) Define "not working."
3) Do you have to write this method yourself? If not, look at the docs for java.lang.Integer.
4) Print out sum inside the loop so you can see what's happening each time. Also print out other variables, the results of intermediate calculations, etc., so you can see which code is being executed, how many times, and what it's doing.