value-returning function help

I have been trying to work on this program that takes a "necklace program" that I wrote and puts the results of that program into a multiplication table. I am doing it using a value returning function but keep getting the following errors and have no clue what they mean. Could anyone give me some tips?
error C2082: redefinition of formal parameter 'num1'
error C2082: redefinition of formal parameter 'num2'

{


Here is my program.

Code:

# include <cmath>
# include <iostream>
using namespace std;
# include <iomanip>



int necklace( int, int);

int main ()
{	
	cout << setw(5) << " ";
	int count;
	count = 1;
	while ( count <= 15)
	{ 
		cout << setw(5) << count;
		count++;
	}
	cout << endl;
	count = 1;
	cout << setw(5) << " ";
	while (count <=15)
	{	
		cout << setw(5) << "___";
		count++;
	}
	cout << endl;

	int column, row;
	column = 1;
	while (column <=15)
	{
		cout << setw(3) << column << "|";
		row = 1;
		while ( row <=15)
		{	int l;
		l = necklace(row, column);
		cout << setw(5) << l;




		row++;
		}
		cout << endl;
		column++;

	}

}



	int necklace( int num1, int num2)
	{	

		int num3, num4, input1, input2, length, newNumber, newDigit;
		bool notDone;

		input1=num3;
		input2=num4;

		length=0;
		notDone= true;  
		while (notDone)

		{	
			newNumber = num1+num2;
			newDigit  = newNumber &#37; 10;
			length = length+1;
			num3 = num4;
			num4 = newDigit;

			if (num3 == input1 && num4 == input2)
			{
				notDone= false;
			}
		}
		return length;
	}

Define the necklace function after defining the main function.

Ok I fixed that problem but now the output is stopping after the first line and not continuing on down each row. Here is the updated code.

Code:

# include <cmath>
# include <iostream>
using namespace std;
# include <iomanip>



int necklace( int, int);

int main ()
{	
	cout << setw(5) << " ";
	int count;
	count = 1;
	while ( count <= 9)
	{ 
		cout << setw(5) << count;
		count++;
	}
	cout << endl;
	count = 1;
	cout << setw(5) << " ";
	while (count <=9)
	{	
		cout << setw(5) << "___";
		count++;
	}
	cout << endl;

	int column, row;
	column = 1;
	while (column <=9)
	{
		cout << setw(3) << column << "|";
		row = 1;
		while ( row <=15)
		{	int l;
		l = necklace(row, column);
		cout << setw(5) << l;




		row++;
		}
		cout << endl;
		column++;

	}

}



	int necklace( int num1, int num2)
	{	

		int  input1, input2, length, newNumber, newDigit;
		bool notDone;

		input1=num1;
		input2=num2;

		length=0;
		notDone= true;  
		while (notDone)

		{	
			newNumber = num1+num2;
			newDigit  = newNumber % 10;
			length = length+1;
			num1 = num2;
			num2 = newDigit;

			if (num1 == input1 && num2 == input2)
			{
				notDone= false;
			}
		}
		return length;
	}

If num1 and num2 are going to always store a single digits then num1 is never going to be equal to 10-15 (input1) and notDone will always be false.

Code:

using namespace std;
# include <iomanip>

You should NEVER use a "using namespace XXX" before an include.

--
Mats