Java Code Example: convert decimal to binary number

To convert a number from the decimal system to the binary system, the toBinaryString() method is used in Java. The Integer class provides several methods, such as the conversion methods.

import java.util.Scanner;

public class ConvertToBinary {
  public static void main(String[] args) {
    int num;

    Scanner s = new Scanner(System.in);
    System.out.print("Please enter a number: ");

    num = s.nextInt();

    s.close();
    
    String binary = Integer.toBinaryString(num);
    System.out.println("Binary value of number " + num + " is: " + binary);
  }
}

Output

Please enter a number: 13
Binary value of number 13 is: 1101