Homework help

[Kris Rossman]

Hey guys new C++ college student here needing help with an assignment. I have to display the letter grade obtained from the average of the scores and the lowest score in the file. I realize I don't have any code for the lowest grade. That's because I don't know how to do it. Also why is the letter grade not showing? It's just blank. Any help would be really appreciated...its due tonight :(

  /*

Programmer name:	Kris Rossman
date:				11/15/2013
assignment:			Lab 11 Part 3

description:		Gym Membership                                                     
	
INPUTS:
	cin - menu option, # of months                          
OUTPUTS:
	cout - message to the user based on menu option.                         
*/
#include <cstdlib>
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <time.h>
#include <cmath>
#define myDate 		"November 15th, 2013            "
#define myActivity  "Lab 11 Part 3                  "
#define line1  "   This program is a menu listing the types of     "
#define line2  "   gym membership.  User may enter a option and a  "
#define line3  "   message is displayed.                           "
#define over2  "\t\t"
#define over3  "\t\t\t"
#define over4  "\t\t\t\t"
#define down5  "\n\n\n\n\n"
#define down8  "\n\n\n\n\n\n\n\n"
#define down10 "\n\n\n\n\n\n\n\n\n\n"
#define down11 "\n\n\n\n\n\n\n\n\n\n\n"
#define down12 "\n\n\n\n\n\n\n\n\n\n\n\n"                                                  

using namespace std;


void welcome();
void splash();  
void getGrade(float);

int main(int argc, char *argv[]) 
{
	string filename;
	ifstream infile;
	int score, count = 0, total = 0;
	float average;
	char grade;
	
	splash();
	welcome();
	
	
	cout << showpoint << setprecision(1) << fixed;
	
	system("CLS");
	cout << down11
	 	 << over3 << "Enter a file name: ";
	cin >> filename;
	
	infile.open(filename.c_str());
	system("CLS");
	cout << down5;
	
			cout << over4 << "Scores Summary" << endl;
			cout << over4 << "--------------" << endl;
			
	if (infile)
	{
		while (!infile.eof())
		{
			infile >> score;
			if (score >= 0 && score <= 100)
			{
				
				count++;
				total += score;
				cout << over4 << "Score " << count << ":" << setw(8) << score << endl;
				
			}
		}
		average = total / static_cast<double>(count);
		
		
		cout << over4 << "Number of scores = " << count << endl;
		cout << over4 << "Scores total     = " << total << endl;
		cout << over4 << "Average          = " << average << "%" << endl;
		cout << over4 << "Lowest Score     = " << endl;
		getGrade(average);
			}
	else
	{
		cout << over3 << "\"" << filename
			 << "\" could not be found!";
	}
	

	
	
	return 0;
}
void getGrade(float average)
{
	float num;
	const float A = 90.00,
			    B = 80.00,
			    C = 70.00,
			    D = 60.00;
	char grade;
	
	if (num >= A)
		grade = 'A';
	else if (num >= B)
		grade = 'B';
	else if (num >= C)
		grade = 'C';
	else if (num >= D)
		grade = 'D';
		
	cout << over4 << "Grade            = " << grade << endl;	

}

void splash ()
{
	system("CLS");
	cout << "\n\n\n"
		 << "\n\t\t	       _ "	 
		 << "\n\t\t              (_)          _ "
		 << "\n\t\t          _         .=.   (_) "
		 << "\n\t\t         (_)   _   //(`)_            \"By blood a king,    "
		 << "\n\t\t              //`\\/ |\\ 0`\\\\           in heart a clown.\"  "
		 << "\n\t\t              ||-.\\_|_/.-||          ~Alfred Lord Tennyson"
		 << "\n\t\t              )/ |_____| \\(    _ "
		 << "\n\t\t             0   #/\\ /\\#  0   (_) "
		 << "\n\t\t                _| o o |_ "
		 << "\n\t\t         _     ((|, ^ ,|)) "
	 	 << "\n\t\t        (_)     `||\\_/||` "
	 	 << "\n\t\t                 || _ ||      _ "
		 << "\n\t\t                 | \\_/ |     (_) "
	 	 << "\n\t\t             0.__.\\   /.__.0 "
		 << "\n\t\t              `._  `\"`  _.' "
		 << "\n\t\t       kkr       / ;  \\ \\ "
		 << "\n\t\t               0'-' )/`'-0 "
		 << "\n\t\t                   0` "
		 << "\n\n\n";

	system("PAUSE");
}	
	
void welcome()
{
	system("CLS");
	cout << "\n\n\n";	
	cout << "\n\t/--------------------------------------------------------------\\";
	cout << "\n\t|                      About This Program                      |";
	cout << "\n\t+--------------------------------------------------------------+";
	cout << "\n\t|                                                              |";
	cout << "\n\t|                                                              |";
	cout << "\n\t|             Programmer's Name: Kris Rossman                  |";
	cout << "\n\t|                          Date: "myDate                      "|";        
	cout << "\n\t|               Name of program: "myActivity                  "|";
	cout << "\n\t|                                                              |";
	cout << "\n\t|    /-------------------- Description --------------------\\   |";
	cout << "\n\t|    | "   line1                                         " |   |";
	cout << "\n\t|    | "           line2                                 " |   |";
	cout << "\n\t|    | "                         line3                   " |   |";
	cout << "\n\t|    \\-----------------------------------------------------/   |";
	cout << "\n\t|                                                              |";
	cout << "\n\t|                                                              |";
	cout << "\n\t|                                                              |";
	cout << "\n\t\\--------------------------------------------------------------/";
	cout << "\n\n\n";
	system("PAUSE");
}

[Duthomhas]

Line 70: don't loop on EOF

		while (infile >> score)
		{

			if (score >= 0 && score <= 100)
			{

This is probably killing your average, so that grade gets past all the if..elses without being assigned a value. Since the value it has is random, you might see anything in the output.

	if (num >= A)
		grade = 'A';
	else if (num >= B)
		grade = 'B';
	else if (num >= C)
		grade = 'C';
	else if (num >= D)
		grade = 'D';
	else // if (grade < D), student fails, right?
		grade = 'F';

To get the lowest score, you'll need another variable, like int lowest_score = 100;. While you read the scores in from file, check to see if score is less than lowest_score. If it is, you'll need to update the lowest score's value.

Hope this helps.