how can i make average/maximum/minimum score to an output file?

[catastrophe]

i have to make a score average, minimum, maximum as statistics for the out file. here is the code i have done:

#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>
#include <assert.h>


using namespace std;


int openfiles(ifstream& infile, ofstream& outfile);


void Size(ofstream&, int, string);


int main()
{
	int num_student = 4, count, length, score2, w[6];


	ifstream infile, curvingfile; char x;


	ofstream outfile; float score;


	string  key, answer, id;


	do {
		openfiles(infile, outfile);  // function calling


		infile >> key; // answer key


		for (int i = 0; i < num_student; i++) // loop over each student


		{
			infile >> id;


			infile >> answer;


			count = 0;


			length = key.size(); // length represents number of questions in exam from exam1.dat
								 // size is a string function....
			
			Size (outfile, length, answer);


			for (int j = 0; j < length; j++) // loop over each question
			{
				if (key[j] == answer[j])


					count++;
			}


			score = (float) count / length; 


			score2 = (int)(score * 100);


			outfile << id << "     " << score2 << "%";


			if (score2 >= 90)//<-----w[0]


				outfile << "A" << endl;


			else if (score2 >= 80)//<-----w[1]


				outfile << "B" << endl;


			else if (score2 >= 70)//<-----w[2]


				outfile << "C" << endl;


			else if (score2 >= 60)//<-----w[3]


				outfile << "D" << endl;


			else if (score2 >= 50)//<-----w[4]


				outfile << "E" << endl;


			else if (score2 < 50)//<-----w[5]


				outfile << "F" << endl;
		}
		cout << "Would you like to attempt a new trial? (y/n): ";


		cin >> x;
	
	} while (x == 'y' || x == 'Y');


	return 0;
}


int openfiles(ifstream& infile, ofstream& outfile)
{
	string name1, name2, name3, answerstring, curvedata;


	cin >> name1; name2; name3;
	if (name1 == "exit" || name2 == "exit" || name3 == "exit" ) return false;
	 
	cout << "Input the name for the exam file: ";


	cin >> name1;


	infile.open(name1.c_str());


	infile >> answerstring;


	cout << "Input the name for the curving file: ";


	cin >> name2;


	infile.open(name2.c_str());


	infile >> curvedata;


	cout << "Input the name for the output: ";


	cin >> name3;


	outfile.open(name3.c_str());


	return true;
}


void Size(ofstream& outfile, int length, string answer)


{
	bool check;// extra answers, lesser answers...


	if (answer.size() > length)


	{
		outfile << "Unnecessary extra answers";
	}


	else if (answer.size() < length)


	{
		outfile << "The remaining answers are incorrect";
	}


	else { check = false; };
}

[Salem]

You already have an open thread.
http://cboard.cprogramming.com/cplus...hing-here.html

It's also clear that you're not really paying any attention.
Your openfiles() is as broken as it ever was.