Write a Java program to convert a decimal number to binary number and vice versa.

import java.util.*;
class DectoBin
{
public static void main(String arg[])
{

    Scanner sc=new Scanner(System.in);
    System.out.println("Enter a decimal number");
    int n=sc.nextInt();
    int  bin[]=new int[100];
    int i = 0;
    while(n > 0)
    {
    bin[i++] = n%2;
       n = n/2;
    }
   System.out.print("Binary number is : ");
    for(int j = i-1;j >= 0;j--)
   {
       System.out.print(bin[j]);
   }
}
}

Output:

Enter a decimal number
4
Binary number is : 100