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

#include <iostream>
#include <math.h>
using namespace std;
 
int main()
{
        int dec_num, rem, quot, i=1, j;
        int bin_num[100];

		cout << "\n\n Convert a decimal number to binary number:\n";
	cout << "---------------------------------------------------\n";
	cout << " Input a decimal number: ";
	cin>> dec_num;
        quot = dec_num;
        while(quot != 0)
        {
            bin_num[i++] = quot%2;
            quot = quot/2;
        }
        cout<<" The binary number is: ";
        for(j=i-1; j>0; j--)
        {
            cout<<bin_num[j];
        }
   cout<<("\n");  
 }