Write a program to convert from decimal to Hexadecimal. CANNOT use Integer.toHex

Question

                    Write a program to convert from decimal to Hexadecimal. CANNOT use Integer.toHexString(in). Program also has to check if decimal                     entered is possitive.This is what I have so far. Cannot figure out what I am doing wrong. When I enter 25 result comes out as 1 which is not wright.                 

                                     import java.lang.*;
                    import java.util.Scanner;
                    
                    public class FindHexString {
                    
                    public static void main(String[] args) {
                    Scanner input = new Scanner(System.in);
                    
                    String hex = "";
                    int decimal = 0;
                    int remainder = 0;
                    int quotient = 0;
                    
                    System.out.print("Enter a number to be converted: ");
                    decimal = input.nextInt();
                    
                    while (decimal > 16) {
                    quotient = decimal / 16;
                    remainder = decimal % 16;
                    
                    do {
                    remainder = decimal % 16;
                    if (remainder == 10) {
                    hex = "A" + hex;
                    
                    }
                    if (remainder == 11) {
                    hex = "B" + hex;
                    
                    }
                    if (remainder == 12) {
                    hex = "C" + hex;
                    
                    }
                    if (remainder == 13) {
                    hex = "D" + hex;
                    
                    }
                    if (remainder == 14) {
                    hex = "E" + hex;
                    
                    } else if (remainder == 15) {
                    hex = "F" + hex;
                    }
                    
                    
                    } while (decimal < 16);
                    decimal--;
                    }
                    System.out.print("Your number in hexadecimal is: " + hex + quotient);
                    }
                    }

Explanation / Answer

import java.lang.*;

import java.util.Scanner;

public class FindHexString {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

char a[ ]=new char [ ];

int decimal = 0;

int remainder = 0;

int quotient = 0;

int i=0;

System.out.print("Enter a number to be converted: ");

decimal = input.nextInt();

while (decimal > 16) {

decimal = decimal / 16;

remainder = decimal %16;

if (remainder == 10)

a[i++]='A';

if (remainder == 11)

A[i++]='B';

if (remainder == 12)

A[i++]='C';

if (remainder == 13)

A[i++]='D';

if (remainder == 14)

A[i++]='E';

if (remainder==15)

A[i++]='F';

if(remainder <10)

A[i++]='remainder'; }

for(int j=i-1;j>=0;j - -)

system.out.print(A[j]);

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