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Compiling error, unresolved external error

jmelchior1 (5)
I tried writing a program to drop the lowest of 5 inputs and calculate the average of the remaining 4, but I can't compile because of an error I am receiving. the error is:

Error 1 error LNK2019: unresolved external symbol "int __cdecl findLowest(int &,int &,int &,int &,int &)" (?findLowest@@YAHAAH0000@Z) referenced in function "void __cdecl calcAverage(double &)" (?calcAverage@@YAXAAN@Z)

I don't know what it means or how to fix it. My code is as follows:

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

void getScore(int &, int &, int &, int &,int &);
void calcAverage(double &);
int findLowest(int &, int &, int &, int &, int &);

int main()
{

	int test1 = 0, test2 = 0, test3 = 0, test4 = 0, test5 = 0;
	string response; 
	//double averge;


	getScore(test1, test2, test3, test4, test5);
	//calcAverage(averge);
	
	cout << "Are there any more test scores?" << endl;
	cin >> response;
	cout << endl;
	if (response == "yes")
	{
		//getScore(test1, test2, test3, test4, test5);
		//calcAverage(averge);
	}

	system("pause");
	return 0;
}


void getScore(int &num1, int &num2, int &num3, int &num4, int &num5)
{
	cout << "What was your score for the first test?" << endl;
	cin >> num1;
	cout << endl;
	if (num1 < 1 || num1 > 100)
	{
		cout<<"Scores must be between 1 and 100, re-enter the score" << endl;
		cin >> num1;
	}
	
	cout << "What was your score for the second test?" << endl;
	cin >> num2;
	cout << endl;
	if(num2 < 1 || num2 > 100)
	{
		cout<<"Scores must be between 1 and 100, re-enter the score" << endl;
		cin >> num1;
	}

	cout << "What was your score for the third test?" << endl;
	cin >> num3;
	cout << endl;
	if(num3 < 1 || num3 > 100)
	{
		cout<<"Scores must be between 1 and 100, re-enter the score" << endl;
		cin >> num1;
	}

	cout << "What was your score for the fourth test?" << endl;
	cin >> num4;
	cout << endl;
	if(num4 < 1 || num4 > 100)
	{
		cout<<"Scores must be between 1 and 100, re-enter the score" << endl;
		cin >> num1;
	}
	
	cout << "What was your score for the fifth test?" << endl;
	cin >> num5;
	cout << endl;
	if(num5 < 1 || num5 > 100)
	{
		cout<<"Scores must be between 1 and 100, re-enter the score" << endl;
		cin >> num1;
	}
	
	//return num1, num2, num3, num4, num5;
}
	

void calcAverage(double &average)
{
	int number1, number2, number3, number4, number5, lowest;

	lowest = findLowest(number1, number2, number3, number4, number5);

	cout << lowest << endl;

}
int findLowest(int &num1, int &num2, int &num3, int &num4, int &num5, int &lowest)
{

	lowest = num1;

	if (num2 < lowest)
	{
		lowest = num2;
		//return lowest;
	}
	else if (num3 < lowest)
	{
		lowest = num3;
		//return lowest;
	}
	else if (num4 < lowest)
	{
		lowest = num4;
		//return lowest;
	}
	else if (num5 < lowest)
	{
		lowest = num5;
		//return lowest;
	}
	return lowest;
}


What might be causing the error and how might I fix it?
keskiverto (10402)
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int findLowest(int &,     int &,     int &,     int &,     int &); // Decl
int findLowest(int &num1, int &num2, int &num3, int &num4, int &num5, int &lowest) // Def
{
  // code
}

Count the parameters of Decl. Then count the parameters of Def.

These are not the declaration and definition of one function. They are overloads. One you only declare (but call from calcAverage). The other you do implement, but don't declare separately.

The error is from linker, which tries to link the call in calcAverage() with (non-existent) implementation.
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