Convert Decimal to Binary using RECURSION !

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#include <bits/stdc++.h>
using namespace std;
int bin(int num)
{
    static int a = 0;
    if (num / 2 != 0)
        bin(num / 2);
    a = a * 10 + num % 2;
    return a;
}
int main()
{
    int num;
    cout << "Enter the Number : ";
    cin >> num;
    cout << "The binary number will be : " << bin(num) << endl;
}

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