Convert binary number to decimal number

Write a program to convert binary to decimal number in java.

 

Write java code Convert binary number to decimal number.

 

Convert binary to decimal Number using java.

 

//convert binary to decimal

import java.io.*;

public class binary2decimal

{

            public static void main(String[]args)throws IOException

            {

                        int num,i=0,k,r;

                        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

                        System.out.println("Enter the number to convert binary to decimal");

                        num=Integer.parseInt(br.readLine());

                        int a[]=new int[20];

                        //int b[]=new int[20];

                        while(num>0)

                        {

                                    a[i]=num%10;

                                    num=num/10;

                                    i++;

                        }

                        k=i-1;

                        r=0;

                        while(k>=0)

                        {

                                    r=(int)(r+(a[k]*Math.pow(2,k)));

                                    k--;

                        }

                        System.out.print(r);

            }

 

}