Convert decimal to binary in java

In this post, we will see how to convert decimal to binary in java.

There are lot of ways to convert decimal to binary in java.Let’s explore them one by one.

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Using Integer.toBinaryString() method

You can simply use inbuilt Integer.toBinaryString() method to convert a decimal

package org.arpit.java2blog;

public class DecimalToBinaryInBuiltMain {

    public static void main(String[] args) {

        System.out.println("Binary representation of 12 : "+ Integer.toBinaryString(12));
        System.out.println("Binary representation of 32 : "+Integer.toBinaryString(32));
        System.out.println("Binary representation of 95 : "+Integer.toBinaryString(95));
    }

}

Output:

Using iterative array approach

package org.arpit.java2blog;
import java.util.Scanner;
public class DecimalToBinaryArrayMain
{
    public static void main(String arg[])
    {

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

        sc.close();
    }
}

Output:

Using stack

    package org.arpit.java2blog;

    import java.util.Scanner;
    import java.util.Stack;

    public class DecimalToBinaryStackMain
    {
        public static void main(String[] arg) 
        { 
            Scanner scanner= new Scanner(System.in); 
            Stack stack= new Stack(); 
            System.out.println("Enter decimal number: ");  
            int num = scanner.nextInt();
            while(num != 0)
            {
                int d = num % 2;
                stack.push(d);
                num /= 2;
            } 
            System.out.print("Binary representation is : ");
            // Print binary presentation
            while (!(stack.isEmpty() ))
            {
                System.out.print(stack.pop());
            }
            scanner.close();
        }
    }

Output:

That’s all convert decimal to binary in java.