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#include <iostream> // cout, cin
#include <cstdlib> // exit()
#include <string> // strings
#include <fstream> // file processing
#include <iomanip> // stream manipulation
using namespace std;
const int MAX_STUDENTS = 25; // We will not process more than 25 students even if the file contains more
const int MAX_GRADES = 5; // Each student has exactly 5 grades
const string FILENAME = "NamesGrades.txt"; // The name of the file that you will read
int loadStudentNamesGrades(string students[], int grades[][MAX_GRADES], string fileName, int maxStudents);
void displayAverages(string students[], int grades[][MAX_GRADES], int studentCount);
void displayMax(string students[], int grades[][MAX_GRADES], int studentCount);
void displayMin(string students[], int grades[][MAX_GRADES], int studentCount);
char getLetterGrade(double grade);
int getLongestNameLength(string students[], int studentCount);
int main()
{
int studentCount = 0; // number of students processing
string students[MAX_STUDENTS]; // Name of student
int grades[MAX_STUDENTS][MAX_GRADES]; // table of grades
char choice; // choice from user
studentCount = loadStudentNamesGrades(students, grades, FILENAME, MAX_STUDENTS);
do
{
cout << "\nGrade Report Program\n\n";
cout << "\t1. Display Average Grade\n";
cout << "\t2. Display Maximum Grade\n";
cout << "\t3. Display Manimum Grade\n";
cout << "\t4. Quit Program\n";
cout << "Enter your choice (1-4): ";
cin >> choice;
while (getchar() != '\n'); // flushing the line
// Process the choice
switch (choice)
{
case '1': // average
displayAverages(students, grades, studentCount);
break;
case '2': // maximum
displayMax(students, grades, studentCount);
break;
case '3': // minimum
displayMin(students, grades, studentCount);
break;
case '4': // quit
break;
default:
cout << "Invalid option; please try again.\n\n";
}
} while (choice != '4');
cout << endl;
system("PAUSE");
cout << "Press any key to continue";
cin.get();
return 0;
}
int loadStudentNamesGrades(string students[], int grades[][MAX_GRADES], string fileName, int maxStudents)
{
ifstream inFile; // input file stream
string firstName; // first name of student
string lastName; // last name of student
int actualGrades; // number of grades read
inFile.open(fileName.c_str()); // *** CHANGED TO C-STRING RATHER THAN STRING
if (!inFile)
{
cout << "Could not open file" << endl;
system("PAUSE");
exit(1);
}
// Loop through each row
for (int i = 0; i < maxStudents && (inFile >> firstName >> lastName);
i++, actualGrades++)
{
for (int j = 0; j < MAX_GRADES; j++)
{
inFile >> grades[i][j];
}
// combine first and last name
students[i] = firstName + " " + lastName;
}
inFile.close();
return actualGrades;
}
void displayAverages(string students[], int grades[][MAX_GRADES], int studentCount)
{
double average; // average of grades for each student
int total; // total of all grades
// get length of the longest first name
int maxLength = getLongestNameLength(students, studentCount);
// set up table header
cout << setprecision(1) << fixed << showpoint;
cout << "\n\n Grade Averages\n";
cout << setw(maxLength + 1) << left << "Student Name"
<< setw(4) << right << "Average"
<< setw(3) << left << "Letter Grade" << endl;
for (int i = 0; i < studentCount; i++)
{
cout << setw(maxLength + 1) << left << students[i];
total = 0; // accumulator set to 0
for (int j = 0; j < MAX_GRADES; j++)
{
total += grades[i][j];
}
average = static_cast<double>(total) / MAX_GRADES;
cout << setw(4) << right << average
<< setw(3) << getLetterGrade(static_cast<int>(average))
<< endl;
}
}
void displayMax(string students[], int grades[][MAX_GRADES], int studentCount)
{
int maxGrade; //max grade so far
int maxLength; // getLongestNameLength(firstName, studentCount);
// set up header
cout << "\n\nMax Grades\n";
cout << setw(maxLength + 1) << left << "Student Name"
<< setw(4) << right << "Max"
<< setw(3) << "Letter Grade" << endl;
for (int i = 0; i < studentCount; i++)
{
cout << setw(maxLength + 1) << left << students[i];
maxGrade = grades[i][0];
for (int j = 1; j < MAX_GRADES; j++)
{
if (maxGrade < grades[i][j])
{
maxGrade = grades[i][j];
}
}
cout << setw(4) << right << maxGrade
<< setw(3) << getLetterGrade(maxGrade) << endl;
}
}
void displayMin(string students[], int grades[][MAX_GRADES], int studentCount)
{
int minGrade; //min grade so far
int maxLength; // getLongestNameLength(firstName, studentCount);
cout << "\n\nMin Grades\n";
cout << setw(maxLength + 1) << left << "Student Name"
<< setw(4) << right << "Min"
<< setw(3) << "Letter Grade" << endl;
for (int i = 0; i < studentCount; i++)
{
cout << setw(maxLength + 1) << left << students[i];
minGrade = grades[i][0];
for (int j = 1; j > MAX_GRADES; j++)
{
if (minGrade < grades[i][j])
{
minGrade = grades[i][j];
}
}
cout << setw(4) << right << minGrade
<< setw(3) << getLetterGrade(minGrade) << endl;
}
} // *** ADDED END OF FUNCTION
char getLetterGrade(double grade)
{
if (grade > 90)
return 'A'; // *** USE ' FOR CHAR, NOT "
else if (grade > 80)
return 'B';
else if (grade > 70)
return 'C';
else if (grade > 60)
return 'D';
else
return 'F';
}
int getLongestNameLength(string students[], int studentCount)
{
int maxLength = 0; // max length so far
for (int i = 0; i < studentCount; i++)
{
// is it longer?
if (students[i].length() > maxLength) // *** CHANGED to students
{
maxLength = students[i].length(); // *** CHANGED to students[i]
}
}
return maxLength;
}
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