Write a program in C++ to convert a binary number to hexadecimal number

#include <iostream>
#include <math.h>
using namespace std;
 
int main()
{
  int hex[1000];
  int i = 1, j = 0, rem, dec = 0, binaryNumber;
	cout << "\n\n Convert a binary number to hexadecimal number:\n";
	cout << "----------------------------------------------------\n";
	cout << " Input a binary number: ";
	cin>> binaryNumber;
  while (binaryNumber > 0) 
  {
   rem = binaryNumber % 2;
   dec = dec + rem * i;
   i = i * 2;
   binaryNumber = binaryNumber / 10;
  }
   i = 0;
  while (dec != 0) 
  {
   hex[i] = dec % 16;
   dec = dec / 16;
   i++;
  }
  cout<<" The hexadecimal value: ";
  for (j = i - 1; j >= 0; j--)
  {
   if (hex[j] > 9) 
   {
    cout<<(char)(hex[j] + 55)<<"\n";
   } 
   else
   {
    cout<<hex[j]<<"\n";
   }
  }
}