Finding Lowest score from a txt file

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#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main()
{

	ifstream gradeFile;	
 	gradeFile.open("ScoreData.txt");

	if(gradeFile.fail())
	{	
		cout << "File not found. Program terminated." << endl;
		return 1;
	}
	
	char initial1;		// initial one
	char initial2;		// initial two
	int score;			// student's test scores
	int numscores = 0;
	int sum = 0;
	float average;
	int s = 1;
	int lowestscore = 0;
	int M = 20;

	cout << "Name     ";
	for(s; s <= 10; s++)
		cout << left << setw(5) << s;
		cout << left << setw(5) << "Low";
		cout << left << setw(5) << "Avg";
	
	while(!gradeFile.eof())
	{
		gradeFile >> initial1 >> initial2;
		cout << "\n" << initial1 << "." << initial2 << ".     ";
		
		do
		{
			gradeFile >> score;
			if(score != -1)
			{
			cout << left << setw(5) << score;
			sum += score;
			numscores++;
			}
		}
		while(score != -1);

		average = (float) (sum - lowestscore) / numscores;
		cout << left << setw(5) << fixed << setprecision(1) << average; 
	}
	
	//for(
	gradeFile.close();
	cout << "\nAll Student Processed." << endl;

	return 0;
}


I'm having trouble taking out the lowest score from each row and placing it in the right spot on the display.

Name 1  2  3  4  5  6  7  8  9  10    Low Avg
A.A. 5  11 9  5  8  5  3              3   7.2
R.D. 11 2  3  12 8  11 9              2   9.0
J.E. 10                               N/A 10.0
K.H. 4  11 5  4  6  8  2  6  11 5     2   6.7
G.M. 10 1  1  9  3                    1   5.8
S.O. 3  1  6                          1   4.5


That is how i what it to look. Right now it looks like this.

Name 1  2  3  4  5  6  7  8  9  10    Low Avg
A.A. 5  11 9  5  8  5  3  6.6
R.D. 11 2  3  12 8  11 9  7.3
J.E. 10 7.5
K.H. 4  11 5  4  6  8  2  6  11 5     7.0
G.M. 10 1  1  9  3  6.6
S.O. 3  1  6  6.3


As you can see i cant get the lowest score out or get the avg or low scores in the right places. Any help would be great Thank You.
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