C++ How to tally grade range in a file - c++

Question

Good afternoon, I'd like to preface by saying this is my first semester working with C++, so I apologize if the answers to the errors I've run into are obvious/simple to answer.
I am trying to implement a program that requests a file from a user that contains a range of grades from students (total of 20). The program asks the user for the range inputs for traditional letter grades (i.e. A = 90-100, B = 80-89, C = 70-79, etc to F), then tallies the number of grades in the input file the user provided.
As of now my program loops through each letter grade to gather the grade range from the user, but I have issues when it comes to tallying the number of grades in the file. It keeps outputting "the number of grades in this range is 29."
(Side note, my code also produces a histogram based off of the tallied number of each grade in the file. Obviously, my histogram output looks super whack at the moment because my tally function needs some fixing.)
Again, apologies if the answer to this is simple. I am very new at this and am learning as I go. Thanks for reading.
#include "SFML/Graphics.hpp"
#include <iostream>
#include <fstream>
#include <string>
const float WIDTH = 550.0; // width of the window for display
const float HEIGHT = 750.0; // height of the window for display
const int FONT_SIZE = 25; // character size
const float LEFT_X = 100.0; // Left X position for label
const float LOW_Y = 700.0; // LOW Y position for label
const float HIGH_Y = 50.0; // HIGH Y position for label
using namespace std;
void readConfig() {
int numGrades = 5;
int maxInGrade = 20;
string filename;
cout << "Enter the number of possible different grades: " << endl;
cin >> numGrades;
cout << "Enter the maximum number of students receiving the same letter grade: " << endl;
cin >> maxInGrade;
cout << "Enter the filename containing the scores: " << endl;
cin >> filename;
}
void initFrequency() {
string letters;
int numGrades = 5;
int freqLetters, low, high;
//below defines the lowest range for each grade
int grade_range_a = 90;
int grade_range_b = 80;
int grade_range_c = 70;
int grade_range_d = 60;
int grade_range_f = 0;
cout << "For each grade enter the" << endl << endl
<< "(1) string representing the grade," << endl
<< "(2) lowest possible score in that range, and" << endl
<< "(3) highest possible score in that range." << endl;
ifstream infile("/Users/quinntortellini/CLionProjects/cop3014-p7-f18/cop3014-p8-f18-attempt2/resources/hist.in");
if(!infile)
{
cout << "Can't open file hist.in";
exit(EXIT_FAILURE);
}
int sum=0, number;
for (int i=0; i<numGrades; i++)
{
cout << "Grade string: " << endl;
cin >> letters;
cout << "Lowest possible score: " << endl;
cin >> low;
cout << "Highest possible score: " << endl;
cin >> high;
cout << "The number of grades in this range is " << endl;
while (infile >> low)
{
if (low == grade_range_a||grade_range_b||grade_range_c||grade_range_d||grade_range_f);
counter = counter += 1;
}
{
cout << counter << endl;
}
infile.close();
}
}
int main() {
int numGrades = 5; // number of different letter grades
int maxInGrade = 20; // maximum number of students in any letter grade
string filename; // name of input file containing scores
//
// implementing readConfig, initializes numGrades, maxInGrade, and
// filename
//
readConfig();
string letters[numGrades]; // each entry represents string representing the grade
int freqLetters[numGrades]; // each entry records occurrence of grades corresponding
// to the letter grade
initFrequency();
//
//
//
sf::RenderWindow window(sf::VideoMode(600, 800), "COP3014 Grade Histogram");
sf::Font font;
font.loadFromFile("resources/arial.ttf");
// You are free to change the following code. However, as it is, it should work
sf::Text min, max;
min.setFillColor(sf::Color::Yellow);
min.setFont(font);
min.setString("0");
min.setCharacterSize(FONT_SIZE);
max.setFillColor(sf::Color::Yellow);
max.setFont(font);
max.setString(to_string(maxInGrade));
max.setCharacterSize(FONT_SIZE);
min.setPosition(LEFT_X-FONT_SIZE*2, LOW_Y-FONT_SIZE);
max.setPosition(LEFT_X-FONT_SIZE*2, HIGH_Y-FONT_SIZE/2);
sf::RectangleShape bars[numGrades];
sf::Text labels[numGrades];
float x_incr = (WIDTH - 100)/numGrades;
float x_offset = LEFT_X+FONT_SIZE;
float height_unit_pixels = (HEIGHT - (HIGH_Y + FONT_SIZE)) / maxInGrade;
int count = 0;
for (int i=0; i < numGrades; i++) {
float height = freqLetters[i] > maxInGrade ? maxInGrade : freqLetters[i];
bars[i].setSize(sf::Vector2f(x_incr-50, height*height_unit_pixels));
bars[i].setPosition(x_offset+x_incr/2, LOW_Y);
bars[i].rotate(180);
labels[i].setFillColor(sf::Color::Yellow);
labels[i].setFont(font);
labels[i].setString(letters[i]);
labels[i].setCharacterSize(FONT_SIZE);
labels[i].setFillColor(sf::Color::Red);
labels[i].setPosition(bars[i].getPosition().x-FONT_SIZE, LOW_Y+FONT_SIZE);
x_offset += x_incr;
}
while (window.isOpen()) {
sf::Event event;
while (window.pollEvent(event)) {
switch (event.type) {
case sf::Event::Closed:
window.close();
break;
default:
window.clear();
window.draw(min);
window.draw(max);
for (int i = 0; i < numGrades; i++) {
window.draw(bars[i]);
window.draw(labels[i]);
}
window.display();
}
}
}
return 0;
}