Thread: adding rows

I am trying to write a program that reads a text file of which the first line contains the number of rows and columns; and then find the average for each row. I can do it if the array is a fixed size, but I am having trouble writing a program that will work if the array size changes. So I thought the best way to do it would be to read in each row as a one-dimensional array. I was able to do that with a simpler program that didn't use double vectors.
This program gives me two errors, one for aveGrade "cannot convert parameter" (commented in the code) and one for tableA[i] "illegal use of this type as an expression". I must be passing the wrong arguments to the function, but I am lost as to what to do about it. Can someone help me get this function...functional?

THANKS!

Code:

/*reads a data file containing student scores on several exams. 
 * The grades for each student are averaged and displayed, and the average score for
 * each exam is calculated and displayed. */

#include <iostream>
#include <fstream>
#include <string>
#include <cassert>
#include "gradeArray.h"
using namespace std;

int tableGrades, tableExams;

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

	cout << "This program will calculate the average grade for each student\n";
		 
	vector<TableRow>TableA;
	fill(INPUT_FILE, TableA);
    aveGrade(TableA[tableGrades], tableExams); // this doesn't work -- 
	// generates a "cannot convert parameter..."
    
	for (int row = 0; row < tableGrades; row++)
		cout << endl << "Average Grade for Student number "
		<< row << " = " << aveGrade(TableA[row], tableExams); 
}
/* fill reads the data file and fills the array */
void fill(const string& fileName, Table& aTable)
{
	 
	ifstream in(fileName.data() );
	assert(in.is_open() );   
	int rows, columns;
	in >> rows >> columns;
    
    cout << "Rows = " << rows << "\n"
		 << "Columns = " << columns << "\n";

	tableGrades = rows;  
	tableExams = columns;  

	Table locTable(rows, TableRow(columns));

	for (int r = 0; r < rows; r++)
		for (int c = 0; c < columns; c++)
			in >> locTable[r][c];
	aTable = locTable;
}
 double aveGrade (int aTableA[], int cols)
 {
	 double gradeSum = 0;
	 for (int i=0; i < tableExams; i++)
		 gradeSum = gradeSum + TableA[i]; // "illegal use of this type as an expression"
	 return gradeSum / tableExams;
 }

This is the header file:

Code:

/*contains the declarations for type Table */

#include <vector>
#include <iostream>
#include <string>
using namespace std;

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

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

// aveGrade determines the average grade for a given student
// finds the average values in a one-dimensional array
double aveGrade (int aTableA[], int cols);

Here is a sample data file:

Code:

3 3
95 40 85
30 95 100
85 90 55