a program that convert decimal to using recursion

#include <iostream>
using namespace std;
void decToBin(int num, int base);
int main()
{
int decimalNum;
int base;
base = 2;
cout << "Enter number in decimal: ";
cin >> decimalNum;
cout << endl;
cout << "Decimal " << decimalNum << " = ";
decToBin(decimalNum, base);
cout << " binary" << endl;
return 0;
}
void decToBin(int num, int base)
{
if (num > 0)
{
decToBin(num / base, base);
cout << num % base;
}
}