I.b. Stuck on function def

Hi, I am trying to write some code that will read in an array of test grades and calculate some averages. I thought I was doing fairly well until it came time to actually call the function that reads in the values from a text file. I got a dose of stupid from somewhere, and it has been mangling my brain for 6 hours now.
The problem lies right where it says fill(INPUT_FILE, WHAT GOES HERE) --- I've got no clue. I thought "aTable" should go there, but it reports it as an undeclared identifier. I then wrote a class for Table, and then promptly received a FATAL ERROR, Internal Compiler error. So I renamed the class to TableA for now, figuring that if I can get ahold of how to define that "fill"
function I can figure out the rest on my own.

So my basic question is: what argument do I use to replace WHAT_GOES_HERE so that I can call my fill function and get this dog hunting again. An explanation would be most appreciated.


here is the grades.cpp file

Code:

/* Grades.cpp
 * Reads exam scores and finds the average for each student, and the average 
 * of all students for each exam. */

#include <iostream>  // cout, cin, <<, >>
#include <fstream>   // ifstream
#include <string>    // string
#include <cassert>   // assert()
#include "GradesA.h"
using namespace std;

int main()
{
	const string INPUT_FILE = "grades.txt";

	cout << "This program will calculate the average grade for each student.\n"
		 << "And the average of the students for each exam.\n";
	
		fill(INPUT_FILE, WHAT_GOES_HERE???? );  // I GET LOST RIGHT HERE...!
		
}
void print(ostream& out, const Table& aTable)
{
	for (int row = 0; row < aTable.size(); row++)
	{
		for (int col = 0; col < aTable[row].size(); col++)
			out << aTable[row][col] << '\t';
		cout << endl;
	}
}

void fill(const string& fileName,  Table& aTable)
{
	cout << "\n Hello from fill\n";
	ifstream in(fileName.data() );             // open stream to file
	assert(in.is_open());                      // verify
 
	int rows,                                  // variables
		columns;                               // for dimensions from first line of file
	in >> rows >> columns;                     // read dimensions

	Table locTable(rows, TableRow(columns));   // construct a local
											   // rows X columns table
	for (int r = 0; r < rows; r++)             // for each row
		for (int c = 0; c < columns; c++)      // input column values
			in >> locTable[r][c];              // into row. Assign locTable
	aTable = locTable;						   // to aTable so it has correct dimensions

	in.close();
}

here is the gradesA.h file

Code:

/* GradesA.h contains the declarations for type Table */

#include <vector>  // vector
#include <iostream> // istream, ostream
#include <string>   // string
using namespace std;

typedef vector<double> TableRow;
typedef vector<TableRow> Table;

// ---output a Table via an ostream
void print(ostream& out, const Table& aTable);

// ---fill a Table with values from a file
//    whose first line is the # of rows and columns
void fill(const string& fileName, Table& aTable);


class Table
{
public:
	void print(ostream & out);
	void read(istream & in);

private:
	int myRow;
	int myColumn;
};

istream& operator>>(istream& in, Table& aTable);
ostream& operator<<(ostream& out, const Table& aTable);

and this is the little text file containing the data to be read

Code:

3 3
95 100 95
90 85 95
100 100 80

Three suggestions:

1. You have a typedef that defines Table as a vector of TableRow objects, then you define a class called Table. You can't do both. Why do you need that class anyway?

2. It looks like your main should be something simple like:

Code:

int main()
{
	const string INPUT_FILE = "grades.txt";

	cout << "This program will calculate the average grade for each student.\n"
		 << "And the average of the students for each exam.\n";

	Table data;
	fill(INPUT_FILE, data);  // I GET LOST RIGHT HERE...!
	print(cout, data);		
}

3. Inside your print function, you accidentally used cout instead of out to output the endl.

I haven't tried your code or anything, I just noticed those things.