#include<string>
#include <iostream>
#include <fstream>
#include <cmath>
#include<cstdlib>

#include <vector>// ******************************************NEW LINE***********************

using namespace std;
//------------------------------global variables
int NumberOfLines = 0;
//-----------------------------function declarations
string GetStudentList();
string GetClassHours();
string OpenStudentFile(string);
void show_lines(vector<string>&);//********************NEW LINE************************
void PrintLine(string);
//-----------------------------create structures
struct Student_Info {
	string FirstName;
	string LastName;
	int StudentID;
	int GPA;
};
//-----------------------------main body
int main()
{
	vector<string>lines;//************************************NEW LINE**************************

	string File1;
	cout << "Welcome to the GradeCaculator Deluxe." << endl;
	cout << "Enter the file name for the list of Students, including the extension::" << endl;
	getline(cin, File1);
	OpenStudentFile(File1);

	
	lines.reserve(NumberOfLines);//****************************************NEW LINE******************************
	//to avoid reallocation - vector size is set to number of lines
	//now content of text file is loaded into vector:
	ifstream inputFile;
	string word;
	inputFile.open(File1.c_str());
	while (getline(inputFile, word))
	{
		lines.push_back(word);
	}
	//show contents of separate lines, asking for line number; You can cut any line and write results to You structure
	show_lines(lines);//********************************NEW LINE****************************
	

	// GetStudentList ();
	// GetClassHours ();
	// getline(File1) ;
	return 0;
}//end main
string OpenStudentFile(string File1)//******************************vector<string>ln*********************
{
	ifstream inputFile;
	string word;
	inputFile.open(File1.c_str());
	if (!inputFile.is_open())
	{
		exit(EXIT_FAILURE);
	}
	cout << "\nThe file has been successfully opened for reading.\n";
	while (getline(inputFile, File1))
	{
		++NumberOfLines;
		
		cout << File1 << endl; //prints contents of text file**********************************excluded from program, contents in container
		
	}
	
	cout << "Number of Lines in text file is: " << NumberOfLines << endl;//prints the number of lines in the text file
	inputFile.close();//*********************NEW LINE***close stream**********************
	return File1;
}
//function to show contents of lines, by numbers, without error checking!!
void show_lines(vector<string>&ln_full)
{
	int vect_size = ln_full.size();
	cout << "Lines in file: " << vect_size << endl;
	cout << "Enter a number to show line:\n";
	int number = 0;
	while (number < vect_size)
	{
		cin >> number;
		cout << ln_full[number-1];
	}

}