**Question:**

Write a Program in Java to input a number in Decimal number system and convert it into its equivalent number in the Hexadecimal number system.

**Note:** Hexadecimal Number system is a number system which can represent a number in any other number system in terms of digits ranging from 0 to 9 and then A – F only. This number system consists of only sixteen basic digits i.e. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F. Here 10 is represented as A, 11 as B and so on till 15 which is represented as F.

For Example: 47 in the Decimal number system can be represented as 2F in the Hexadecimal number system.

**Solution:**

/** * The class Dec2Hex inputs a Decimal number and converts it into its equivalent Hexadecimal number * @author : www.javaforschool.com * @Program Type : BlueJ Program - Java */ import java.io.*; class Dec2Hex { public static void main(String args[])throws IOException { BufferedReader br=new BufferedReader (new InputStreamReader(System.in)); System.out.print("Enter a decimal number : "); int n=Integer.parseInt(br.readLine()); int r; String s=""; //variable for storing the result //array storing the digits (as characters) in a hexadecimal number system char dig[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'}; while(n>0) { r=n%16; //finding remainder by dividing the number by 16 s=dig[r]+s; //adding the remainder to the result n=n/16; } System.out.println("Output = "+s); } }

**Output:**

Enter a decimal number : 47

Output = 2F

Enter a decimal number : 1243

Output = 4DB

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