Beth's HW!

bethshw.cpp

#include <iostream>
#include <array>
#include <string>
#include <iomanip>
#include <fstream>

using namespace std;

const int NUMSTUDENTS = 10;
const int NUMASSIGNMENTS = 10;

struct Student
{
  string nameFirst;
  string nameLast;
  double assignment[NUMASSIGNMENTS];
};

void displayMenu();
void addStudent(int &numStudents, int &numAssignments, Student students[]);
void assignGrades(int &numStudents, int &numAssignments, Student students[]);
void displayStudentGrades(int numStudents, int numAssignments, Student students[]); //displays grades for one student
void listAllScores(int numStudents, int numAssignments, Student students[]);        // lists scores for one assignment
void displayGradeBook(int numStudents, int numAssignments, Student students[]);     //saves gradebook to file

int main()
{
  displayMenu();

  return 0;
}

void displayMenu()
{
  int menuChoice;
  Student students[NUMSTUDENTS];
  int numStudents = 0;
  int numAssignments = 0;
  do
  {

    cout << "What would you like to do? \n1 ADD a new student \n2 ASSIGN GRADES for a new assignment\n"
         << "3 LIST one student, displaying all their grades and their course average \n4 LIST all the scores for a chosen assignment\n"
         << "5 DISPLAY all grades currently contained in the gradebook \n6 QUIT " << endl;
    cin >> menuChoice;

    switch (menuChoice)
    {
      case 1:
      {
        cout << numStudents << " " << numAssignments;
        addStudent(numStudents, numAssignments, students);
        break;
      }
      case 2:
      {
        assignGrades(numStudents, numAssignments, students);
        break;
      }
      case 3:
      {
        displayStudentGrades(numStudents, numAssignments, students);
        break;
      }
      case 4:
      {
        listAllScores(numStudents, numAssignments, students);
        break;
      }
      case 5:
      {
        displayGradeBook(numStudents, numAssignments, students);
        break;
      }
      case 6:
        break;
      default:
      {
        cout << "You didn't input a proper menu choice. Please try again. " << endl;
      }
    }
  } while (menuChoice != 6);
}

void addStudent(int &numStudents, int &numAssignments, Student students[])
{
  cout << numStudents << " " << numAssignments;
  cout << &numStudents << " " << &numAssignments;
  if (numStudents < 10)
  {
    cout << "What is the student's FIRST and LAST name? ";
    cin >> students[numStudents].nameFirst >> students[numStudents].nameLast;
    if (numAssignments > 0)
    {
      cout << "Now you must give them the grades they earned on prior assignments." << endl;
      assignGrades(numStudents, numAssignments, students);
    }
    numStudents++;
    cout << numStudents;
  }
  else
  {
    cout << "You have a problem. You cannot have more than 10 students." << endl;
  }
}

void assignGrades(int &numStudents, int &numAssignments, Student students[])
{
  cout << numStudents << " " << numAssignments;
  cout << &numStudents << " " << &numAssignments;
  if (numStudents > 0)
  {
    if (numAssignments < 10)
    {
      for (int i = 0; i < numStudents; i++)
      {
        cout << "For student " << i + 1 << " please input the student's score for";
        for (int j = 0; j <= numAssignments; j++)
        {
          cout << " assignment " << j + 1 << ": ";
          cin >> students[i].assignment[j];
        }
      }
    }
    else
    {
      cout << "You have a problem. You cannot have more than 10 assignments." << endl;
    }
  }
  else
  {
    cout << "You cannot add grades until you have at least one student mentioned." << endl;
    addStudent(numStudents, numAssignments, students);
    cout << "Now you can give them grades. " << endl;
    assignGrades(numStudents, numAssignments, students);
  }
  ++numAssignments;
}

void displayStudentGrades(int numStudents, int numAssignments, Student students[])
{
  if (numStudents > 0 && numAssignments > 0)
  {
    double average;
    double total = 0;
    cout << "This will display the grades and average for one student." << endl;
    cout << "These are the students, whose grades do you want to see? Type the number next to their name: " << endl;
    for (int i = 0; i < numStudents; i++) // show all students so it is easy to pick the desired one
    {
      cout << i << " " << students[i].nameFirst << " " << students[i].nameLast << endl;
    }
    int pickedStudent;
    cin >> pickedStudent;
    for (int i = 0; i < numAssignments; i++) // display all of their grades
    {
      cout << "Student's score for assignment " << i + 1 << " " << students[pickedStudent].assignment[i] << endl;
      total += students[pickedStudent].assignment[i];
    }

    average = static_cast<double>(total / numAssignments);
    cout << "The student's course average is: " << average << endl;
  }
  else
  {
    cout << "You have an error. Please input more data, then try again." << endl;
  }
}

void listAllScores(int numStudents, int numAssignments, Student students[])
{
  double total = 0;
  double average;
  if (numStudents > 0 && numAssignments > 0)
  {
    int assignmentIndex;
    cout << "What number assignment do you wish to see? The possible numbers are from 1 to " << numAssignments;
    cin >> assignmentIndex;

    for (int i = 0; i < numStudents; i++)
    {
      cout << students[i].assignment[assignmentIndex] << endl;
      total += students[i].assignment[assignmentIndex];
    }
    average = static_cast<double>(total / numAssignments);
    cout << "The class's average for this assignment is: " << average << endl;
  }
  else
  {
    cout << "You have an error. Please input more data, then try again." << endl;
  }
}

void displayGradeBook(int numStudents, int numAssignments, Student students[])
{
  char userChoice;
  ofstream saveGradesOUT;
  cout << "show all student names and grades for each assignment";
  cout << "Would you like to save the Grade Book as a text file named grades.txt? y/n";
  cin >> userChoice;
  if (userChoice == toupper('Y'))
  {
    saveGradesOUT.open("grades.txt");
    for (int i = 0; i <= numStudents; i++)
    {
      saveGradesOUT << students[i].nameFirst << students[i].nameLast;
      for (int j = 0; j <= numAssignments; j++)
        saveGradesOUT << students[numAssignments].assignment[j] << " ";
      saveGradesOUT << endl;
    }
    saveGradesOUT.close();
  }
}