// HW_5a
// Programmer- Nafis Chowdhury
// Main.cpp file
//=========================================

#include <iostream>
using namespace std;

//===========Function Prototype===================
void decToBinary(int num1);


//==============Main Function====================
int main()
{
    int num1;

    cout << "Enter a non-negative integer value: ";
    cin >> num1;

	if (num1 < 0)
	{
	cout << endl << "Invalid Entry." << endl << endl;
	}
	else
	{
        cout << endl << "Decimal " << num1 << " = ";
        decToBinary(num1);
        cout << endl << endl;
        }

	return 0;
}


//==================decToBinary Function====================
void decToBinary(int num1)
{
    int remainder;

    num1 = num1 / 2;
    remainder = num1 % 2;

	if (num1 > 0)
	{
		decToBinary(num1);

	}
	else if (num1 = 0)
	{
		cout << "0";
		return;
	}

	cout << remainder;
}


//=================OUTPUT==========================

Enter a non-negative integer: 0
Decimal to binary = 0
Press any key to continue....

Enter a non-negative integer: 37
Decimal to binary = 0100101
Press any key to continue....

Enter a non-negative integer: -1
Decimal to binary = Invald!
Press any key to continue....