Example: Java program to convert decimal to binary using recursion

import java.util.Scanner;

​

public class Main {

​

    // Recursive function to print binary

    static void convertToBinary(int num) {

        if (num == 0)

            return;

        convertToBinary(num / 2);

        System.out.print(num % 2);

    }

​

    public static void main(String[] args) {

        // Step-1 Input

        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a decimal number: ");

        int num = sc.nextInt();

​

        // Step-2 Handle zero case

        System.out.print("Binary representation: ");

        if (num == 0)

            System.out.print("0");

        else

            convertToBinary(num);

​

        System.out.println();

        sc.close();

    }

}

​