It show resource file is not available, can you please help?

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C++

The client (i.e. main()) should read in the contents of the file. After each grade is read in, it should call the addGrade member function in the Student class to add the new grade (i.e. one grade at a time) to the vector. [Do not create a vector in main and pass the entire vector in to the addGrade function in the Student class. Pass in only one grade at a time and allow the addGrade function to add it to the vector of grades in the class.]
Main() should then produce a report that displays the student’s name and course, the total number of grades in the file, the lowest grade, the highest grade, the average of all the grades, and finally, a listing of all of the grades that were read in. The listing of all of the grades must be displayed in sorted order (ascending – from lowest to highest).
All output should be labeled appropriately, and validity checking should be done on input of the filename and also the grades that are read in.

What I have tried:

MyCode and other files.

<pre>
#ifndef Student_H_
#define Student_H_
#include <iostream>
#include <vector>
#include <algorithm>

class Student // class

{

private: // data members 

	std::vector<int> grades;

	std::string studentName;

	std::string courseName;

public: // functions 

	Student(std::string studentName, std::string course); // constructor 

	~Student();

	void addGrade(int Grade);

	void sortGrade();

	float averageGrade();

	int lowestGrade();

	int highestGrade();

	int gradeCount();

	void displayGrades();

	const std::string& getstudentName() const
	{
		return studentName;
	}

	void setStudent(const std::string& student)
	{
		studentName = student;
	}

	const std::string& getCourse() const
	{
		return courseName;
	}

	void setCourse(const std::string& course)
	{
		courseName = course;
	}

};

#endif

#include "Student.h"

#include <iostream>

// constructor

Student::Student(std::string student, std::string course)
{
	studentName = student;
	courseName = course;
}

// destructor

Student::~Student()
{}


//Function to add a grade to vector

void Student::addGrade(int grade)
{
	// adding grade to vector
	this->grades.push_back(grade);
}


//Function to sort vector

void Student::sortGrade()
{
	sort(grades.begin(), grades.end());
}


float Student::averageGrade()
{
	float avg = 0.0;

	for (size_t i = 0; i < grades.size(); i++)
	{
		avg += grades[i];
	}

	if (grades.size() > 0)
		return (avg / grades.size());

	return 0;
}

// Find lowest grade of a student

int Student::lowestGrade()
{
	int lowGrd = 0;
	if (grades.size() > 0)
	{
		lowGrd = grades[0];

		for (size_t i = 1; i < grades.size(); i++)

		{

			if (lowGrd > grades[i])

			{
				lowGrd = grades[i];
			}
		}
	}
	else
	{
		std::cout << "No grades for " << studentName << std::endl;
	}

	return lowGrd;
}

int Student::highestGrade()
{
	int highGrd = 0;

	if (grades.size() > 0)
	{
		highGrd = grades[0];

		for (size_t i = 1; i < grades.size(); i++)
		{
			if (highGrd < grades[i])
			{
				highGrd = grades[i];
			}
		}
	}
	else
	{
		std::cout << "No grades for " << studentName << std::endl;
	}

	return highGrd;
}

int Student::gradeCount()
{
	return grades.size();
}


void Student::displayGrades()
{
	std::cout << "The grades for " << studentName << " - " << courseName << std::endl;

	sortGrade();

	for (size_t i = 0; i < grades.size(); i++)
	{
		std::cout << grades[i] << std::endl;
	}
}

#include "Student.h"
#include <iostream>
#include <fstream>

using namespace std;



int main()

{
	Student* grade = NULL;
	string fileName;
	string studentName, course;

	cout << "Enter input file name : ";
	cin >> fileName;

	ifstream infile;
	int num = 0;
	infile.open("integers.txt");
	if (infile.fail())
	{
		cout << "Unable to open file: " << fileName << "... Exiting program" << endl;
	}

	else
	{
		grade = new Student(studentName, course);
		while (!infile.eof())
		{
			grade->addGrade(num);
		}

		cout << grade->gradeCount() << " grades were recorded for this course" << endl << endl;

		cout << "Statistics" << endl;
		cout << "Average: " << grade->averageGrade() << endl;
		cout << "Lowest Grade : " << grade->lowestGrade() << endl;
		cout << "Highest Grade : " << grade->highestGrade() << endl << endl;



		grade->displayGrades();
	}

	system("pause");

	return 0;
}