#pragma hdrstop
#include <condefs.h>
#include <iostream.h>
#include <fstream>


//---------------------------------------------------------------------------
#pragma argsused
using namespace std;

ifstream in_stream;

class Student
{
public:
    Student(int q1, int q2, double mid, double final);

    double average();

    void final_letter_grade();

    void output(ostream& outs);

private:
    int quiz1, quiz2, midterm_exam, final_exam;
    double ave;
    char grade;

    double ave_quiz;
    double ave_midterm;
    double ave_final;
};

int main()
{
    Student student1(5, 5, 85, 87), student2(6, 7, 85, 89); //<-요기를 화일로 만들어서 입력 받으려 합니다

    cout << "Student1 initialized as follows:\n";
    student1.output(cout);
    cout << "student2 initialized as follows:\n";
    student2.output(cout);

    getchar();
    return 0;
}

Student::Student(int q1, int q2, double mid, double final)
{
    quiz1 = q1;
    quiz2 = q2;
    midterm_exam = mid;
    final_exam = final;

    ave = ((((quiz1+quiz2)*10)/2)*0.25) + (midterm_exam * 0.25) + (final_exam * 0.5);
}

double Student::average()
{
    return ave;
}

void Student::final_letter_grade()
{
    if (ave >= 90)
    {
        grade = 'A';
    }

    if ((ave >= 80) && (ave < 90))
    {
        grade = 'B';
    }

    if ((ave >= 70) && (ave < 80))
    {
        grade = 'C';
    }

    if ((ave >= 60) && (ave < 70))
    {
        grade = 'D';
    }

    if (ave < 60)
    {
        grade = 'F';
    }
}

void Student::output (ostream& outs)
{
    outs << "Quiz1 is " << quiz1 << endl;
    outs << "Quiz2 is " << quiz2 << endl;
    outs << "Mid-term is " << midterm_exam << endl;
    outs << "Final is " << final_exam << endl;
    outs << "The grade average is " << ave << endl;
    outs << "The final letter grade is " << grade << endl;
    outs << endl;
}

위의 학생 성적을 .txt화일로 만들어서 입력 받게 하려 하는데요...
file 입/출력은 제가 잘 모르겠네요...공부를 좀 더 해야 할듯...
헌데 시간이 없어서 지금 열심히 보고 있지만 그래도 올려 봅니다...
숙제만 아니면 공부해서 하는건데...제출시간이 얼마 남지 않아서요...
부디 좋은 답변 부탁드립니다.