Convert decimal to hex

Hey guys!! Welcome to flower brackets blog. In this post we are going to learn convert decimal to hex.

In number system, decimal number has a base of ten. It has digits from 0 to 9. Whereas hexadecimal number has a base 16.

It has digits from 0 to 9 and A to F. Now let’s see the comparison through a table,

convert decimal to hex

As you can see in the above table, from 0 to 9 the numbers are same in both number system.

After 9, 10 is denoted as ‘A’, 11 is denoted as ‘B’, 12 is denoted as ‘C’, 13 is denoted as ‘D’, 14 is denoted as ‘E’, 15 is denoted as ‘F’ in the hexadecimal system.

In the previous post we saw how to convert binary to decimal and decimal to binary java program. So, let’s see java program to convert decimal to hexadecimal without using method,

import java.util.Scanner;

public class DecimalToHexadecimal
{
   public static void main(String[] args)
   {
      int temp, decimalNumber;
      String hexaDecimal = "";
      char hexa[] = {'0','1','2','3','4','5','6','7','8','9',
'A','B','C','D','E','F'};
 
      Scanner sc = new Scanner(System.in);
      System.out.print("Please enter decimal number : ");
      decimalNumber = sc.nextInt();
 
      while(decimalNumber > 0)
      {
         temp = decimalNumber % 16;
         hexaDecimal = hexa[temp] + hexaDecimal;
         decimalNumber = decimalNumber / 16;
      }
 
      System.out.print("The hexadecimal value of " + decimalNumber + " is : " 
+ hexaDecimal);      
      sc.close();
   }
}

Output:

Please enter decimal number : 10
The hexadecimal value of 0 is : A


Java decimal to hex conversion using Integer.toHexString()

Also read – hexadecimal to decimal java program

import java.util.Scanner;

public class DecimalToHexaExample
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);
      System.out.print("Please enter decimal number : ");
      int decimalNumber = sc.nextInt(); 
      String str = Integer.toHexString(decimalNumber);
      System.out.println("The hexadecimal value is : " + str);
      sc.close();
   }
}

Output:

Please enter decimal number : 10
The hexadecimal value is : a


Java program to convert decimal to hexadecimal using recursion

Let’s see how to convert decimal to hex using recursive method.

import java.util.Scanner;

public class DecimalToHexaDemo
{
   char hexa[] = {'0','1','2','3','4','5','6','7','8','9',
'A','B','C','D','E','F'};
   int temp;
   String hexaDecimal = "";
   String hexadecimal(int num)
   { 
      if(num != 0)
      {
         temp = num % 16;
         hexaDecimal = hexa[temp] + hexaDecimal;
         num = num / 16;
         hexadecimal(num);
      }
      return hexaDecimal;
   } 
 
   public static void main(String[] args)
   {
      DecimalToHexaDemo dth = new DecimalToHexaDemo();
      int decimalNumber;
      Scanner sc = new Scanner(System.in); 
      System.out.println("Please enter decimal number : ");
      decimalNumber = sc.nextInt();
      System.out.println("The hexadecimal value is : ");
      String str = dth.hexadecimal(decimalNumber); 
      System.out.print(str);
      sc.close();
   }
}

Output:

Please enter decimal number : 14
The hexadecimal value is : E

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