Java program to convert decimal to binary using toBinaryString and stack

Let’s learn java program to convert decimal to binary using toBinaryString and stack.

Java program to convert decimal to binary using toBinaryString and stack

Convert decimal to binary in java is the most common java interview question.

Also read – java program to convert decimal to binary using while loop

There are two ways in converting decimal to binary in java, one using toBinaryString() method and another using stack.

Using toBinaryString() method or decimal to binary in java inbuilt function

public class DecimalToBinary
{
   public static void main(String[] args)
   {
      System.out.println("decimal to binary in java inbuilt function 104: ");
      // to binary string java
      System.out.println(Integer.toBinaryString(104));
      System.out.println("\ndecimal to binary in java inbuilt function 554: ");
      // tobinarystring
      System.out.println(Integer.toBinaryString(554));
      System.out.println("\ndecimal to binary in java inbuilt function 644: ");
      System.out.println(Integer.toBinaryString(644));
   }
}



 

Output:

decimal to binary in java inbuilt function 104: 1101000

decimal to binary in java inbuilt function 554 : 1000101010

decimal to binary in java inbuilt function 644 : 1010000100

Also read – java program to convert decimal to binary and vice versa

Using stack

Similarly here’s the java program to convert decimal to binary using stack,

import java.util.*;

public class DecimalBinaryExample
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);                
      Stack<Integer> numStack = new Stack<Integer>();     
      System.out.println("Please enter a decimal number : ");
      int number = sc.nextInt();

      while(number != 0)
      {
         int a = number % 2;
         numStack.push(a);
         number /= 2;
      }
      System.out.print("Binary number : ");
      while(!(numStack.isEmpty()))
      {
         System.out.print(numStack.pop());
      }
      System.out.println();
      sc.close();
   }
}

Output:

Please enter a decimal number : 665
Binary number : 1010011001

Also read – java program to convert binary to decimal

Function to convert decimal to binary in java

public class FunctionDecimalToBinary
{
   public static void main(String[] args) 
   {
      int num = 104;
      functionToBinary(num);
   }

   static void functionToBinary(int number) 
   { 
      int[] binary = new int[1000]; 
      int a = 0;
      while(number > 0)
      { 
         binary[a] = number % 2; 
         number = number / 2; 
         a++; 
      }
      // printing binary number in reverse order
      System.out.println("Function to convert decimal to binary in java: ");
      for(int b = a - 1; b >= 0; b--)
      {
         System.out.print(binary[b]);
      }
   }
}

Output:

Function to convert decimal to binary in java: 1101000

Java program to convert decimal to binary using for loop

import java.util.Scanner;

public class DecimalToBinaryForLoop 
{
   public static void main(String[] args) 
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter a decimal number: ");
      int inputNumber = sc.nextInt();
      System.out.println("Convert decimal to binary using for loop: " + convertToBinary(inputNumber));
      sc.close();
   }

   public static long convertToBinary(int number)
   {
      long binaryNumber = 0;
      int remainder, a;
      for(a = 1; number != 0; a = a * 10)
      {
         remainder = number % 2;
         number /= 2;
         binaryNumber += remainder * a;
      }
      return binaryNumber;
   }
}

Output:

Please enter a decimal number: 554
Convert decimal to binary using for loop: 1000101010