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Java Program For Decimal to Hexadecimal Conversion
  • Last Updated : 09 Mar, 2021

Given a decimal number N, convert N into an equivalent hexadecimal number i.e convert the number with base value 10 to base value 16. The decimal number system uses 10 digits 0-9 and the Hexadecimal number system uses 0-9, A-F to represent any numeric value.


Input : 10
Output: A

Input : 2545
Output: 9F1


  1. Store the remainder when the number is divided by 16 in an array.
  2. Divide the number by 16 now
  3. Repeat the above two steps until the number is not equal to 0.
  4. Print the array in reverse order now.




// Java program to convert Decimal Number
// to Hexadecimal Number
// Importing input output classes
// Main class
public class GFG {
    // Method 1
    // To convert decimal to hexadecimal
    static void decTohex(int n)
        // Creating an array to store octal number
        int[] hexNum = new int[100];
        // counter for hexadecimal number array
        int i = 0;
        while (n != 0) {
            // Storing remainder in hexadecimal array
            hexNum[i] = n % 16;
            n = n / 16;
        // Printing hexadecimal number array
        // in the reverse order
        for (int j = i - 1; j >= 0; j--) {
            if (hexNum[j] > 9)
                System.out.print((char)(55 + hexNum[j]));
    // Method 2
    // Main driver method
    public static void main(String[] args)
        // Custom input decimal number
        // to be converted into hexadecimal number
        int n = 2545;
        // Calling the above Method1 over number 'n'
        // to convert this decimal into hexadecimal number

Time Complexity: O(log N) 

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