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

#include <iostream>
#include <math.h>
using namespace std;
 
int main()
{
    int dec_num, rem, quot, i=1, j;
    int oct_num[100];
	cout << "\n\n Convert a  decimal number to octal number:\n";
	cout << "-----------------------------------------------\n";
	cout << " Input a decimal number: ";
	cin>> dec_num;
        quot = dec_num;
        while(quot != 0)
        {
            oct_num[i++] = quot % 8;
            quot = quot/8;
        }
		
        cout<<" The octal number is: ";
        for(j=i-1; j>0; j--)
        {
            cout<<oct_num[j];
        }
		cout<<"\n";	
}