C4700 c как исправить

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  #include <iostream>
#include <iomanip>
#include <fstream>
#include <string>

using namespace std;

void studentsTest(string fileName, char student_answers[], int response, int QUESTION_AMT);
void checkAnswers(char answers[], char student_answers[], int QUESTION_AMT, int MIN_CORRECT);



int main()
{
	int response;
	const int QUESTION_AMT = 20;
	const int MIN_CORRECT = 15;
	char answers[QUESTION_AMT] = { 'A', 'D', 'B', 'B', 'C', 'B', 'A', 'B', 'C', 'D', 'A', 'C', 'D', 'B', 'D', 'C', 'C', 'A', 'D', 'B' };
	char student_answers[QUESTION_AMT];


	string fileName;
	ofstream textOut;


	studentsTest(fileName, student_answers, response, QUESTION_AMT); /*I keep getting error C4700: uninitialized local variable 'responce' used*/

    checkAnswers( answers, student_answers, QUESTION_AMT, MIN_CORRECT);


	cout << endl << endl;
	system("pause");
	return (0);
}
void studentsTest(string fileName, char student_answers[], int response, int QUESTION_AMT)
{
	cout << "nPlease enter a name for your file>";
	getline(cin, fileName);

	ofstream textOut;
	textOut.open(fileName);

	for (int response = 0; response < QUESTION_AMT; response++)
	{
		cout << "Please enter your answers: " << (response + 1) << ": ";
		cin >> student_answers[response];

		while (student_answers[response] != 'A' && student_answers[response] != 'B' && student_answers[response] != 'C' && student_answers[response] != 'D')
		{
			cout << "nError! Answers must be in captial letters! ex: A, B, C";

			cout << "Please enter your answers: " << (response + 1) << ": ";
			cin >> student_answers[response];
		}
	}
	ifstream textIn;
	textIn.open(fileName);
	if (textIn.fail())
	{
		cout << "nText file not found...program will close";
		cout << endl << endl;
		system("pause");
	}
	textIn.close();
}
void checkAnswers(char answers[], char student_answers[], int QUESTION_AMT, int MIN_CORRECT)
{
	int correctAnswers = 0;

	for (int i = 0; i < QUESTION_AMT; i++)
	{
		if (answers[i] == student_answers[i])
			correctAnswers++;
	}
	cout << "nStudent must have at least 15 correct answers to pass.";
	if (correctAnswers >= MIN_CORRECT)
	{
		cout << "nYou passed the exam!";
	}
	else
	{
		cout << "nYou failed the exam!";
	}

	cout << "nThe following is the list of questions that are incorrect";
	for (int i = 0; i < QUESTION_AMT; i++)
	{
		if (answers[i] != student_answers[i])
			cout << "Question # " << i << " is incorrect! " << endl;
	}

	cout << "nCorrect Answers = " << correctAnswers << endl;
	cout << "nIncorrect Answers = " << QUESTION_AMT - correctAnswers << endl;
}