Convert binary into decimal

Hey people. Ok to be honest I don't even know where to begin on this one. I have pieces of knowledge all over the place but I can't seem to put any of it together. I taught myself how to do binary to decimal conversion on paper using the "convert from binary to decimal wiki how" tutorial.

I don't need you to do my assignment for me but I need to be hinted in right directions on what I should be doing, what the next logical step would be. Preferably in plain english and code.

Here is a correct "example run" of the program:

Code:

` `

3 Input a binary number: -1

4 Input must be >= 0

5

6 Input a binary number: 1121

7 Input must be a Binary number

8

9 Input a binary number: 0011100

10 11100

11 Base 2 Equals

12 28

13 Base 10

Here is what I have so far:

Code:

`import java.util.*; //Scanner class is defined here`

public class BinaryToDecimal {

public static void main(String[] args) {

BinaryToDecimal obj = new BinaryToDecimal();

obj.process();

}

private void process(){

Scanner in = new Scanner(System.in); //required to read input

System.out.print("Input a binary number: ");

int number = in.nextInt(); //reads a line of input

while (number < 0){

System.out.println("Input must be >= 0");

System.out.print("\nInput a binary number: ");

number = in.nextInt(); //accepts new keyboard input again

}

}

}

Other rules:

* You may __not __use any of the Math class built in power() or binary digit processing methods. All calculations must be done explicitly.

* We do not need to use arrays.

It's best to use:

* % (modulus operator) to access the current right-most digit

* / (int division operator) to divide down the current value after processing the right-most digit

* Repeat for all digits

This is the best and easiest way to solve this assignment.