Java Program to Convert Decimal to Binary using Recursion

This is a Java Program to Convert a Number Decimal System to Binary System using Recursion.

Enter any number as an input. Now we make a new method named binary with return type string that gives us the desired result with the help of modulus operation.

Here is the source code of the Java Program to Convert a Number Decimal System to Binary System using Recursion. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. import java.util.Scanner;
  2. public class Convert
  3. {
  4.     public static void main(String[] args) 
  5.     {
  6.         int n;
  7.         String x;
  8.         Scanner s = new Scanner(;
  9.         System.out.print("Enter any decimal number:");
  10.         n = s.nextInt();
  11.         Convert obj = new Convert();
  12.         x = obj.binary(n);
  13.         System.out.println("Binary number:"+x);
  14.     }
  15.     String binary(int y)
  16.     {
  17.         int a;
  18.         if(y > 0)
  19.         {
  20.             a = y % 2;
  21.             return (binary(y / 2) + "" +a);
  22.         }
  23.         return "";
  24.     }
  25. }


$ javac
$ java Convert
Enter any decimal number:25
Binary number:11001

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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