Question

c++

implement a student class

Determine the final scores, letter grades, and rankings of all students in a course.

All records of the course will be stored in an input file, and a record of each student will include the first name, id, five quiz scores, two exam scores, and one final exam score.

For this project, you will develop a program named cpp to determine the final scores, letter grades, and rankings of all students in a course. All records of the course will be stored in an input file, and a record of each student will include the first name, id, five quiz scores, two exam scores, and one final exam score. For each student record, your program should determine the numeric average and letter grade using the following policies a. Each quiz is graded on the basis of 10 points. Among the five quizzes, discard the lowest score and use the remaining four scores for the grade calculation b. Each exam is graded on the basis of 100 points c. The final exam is graded on the basis of 100 points d. For the numeric average, the final exam counts for 40 percent, midterms count for 40 percent, and quizzes count for 20 percent, respectively. Any average of 90 or more is arn A', any average of 80 or more (but less than 90) is a 'B', any average of 70 or more (but less than 80) is a 'C", any average of 60 or more (but less than 70) is a D', and any average below 60 is a F', In this project, your program should ask a user for an input file name. Then, it should read the data into your program and store them in a vector of Student type. (For example vector<Student> course). Student will be a custom class you will write, which should have the following members Student : string : int : double - name id - average grade - rank : char : int + Student () + setName (string) : void + setID (int) : void + setAverage (double) : void + setGrade (char): void + setRank (int) : void + getName ) const : string + getID ) const : int + getAverage ) const: double + getGrade () const : chair + getRank ) const: int + print() const : void

Answer 1

Project1.cpp

#include "Student.h"
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
double calc_average(double s1, double s2, double s3, double s4, double s5, double m1, double m2, double f);
void label_rank(vector<Student> &s);
void a_sort(vector<Student> &s);
void n_sort(vector<Student> &s);
double class_avg(vector<Student> &s);
void histogram(vector<Student> &s);
void rec_finder(vector<Student> &s);
int main()
{
    string n;
    int d;
    vector<Student> course;
    double score1, score2, score3, score4, score5, midterm1, midterm2, final, overall_avg;
    ifstream myfile;
    string filepath;
// user enters in file path
    cout << "Enter file name: ";
    getline(cin, filepath);
    cout << endl;
    myfile.open(filepath.c_str());
// if file can't be found an error message is displayed
    if(myfile.fail())
    {
      cout <<" Failed to open file "<< endl;
      exit(1);
    }
    int index = 0;
    int i = 0;
// reads from file and inputs the information from each line into an object
    myfile >> index;
    course.resize(index);
    while(!myfile.eof() && i < index){
        myfile >> n >> d >> score1 >> score2 >> score3 >> score4 >> score5 >> midterm1 >> midterm2 >> final;
        course[i].setName(n);
        course[i].setID(d);
        course[i].setAverage(calc_average(score1, score2, score3, score4, score5, midterm1, midterm2, final));
        i++;
    }
    myfile.close();

    label_rank(course);
    cout << "================" << endl;
    cout << "Course Report: Numerical Average Order" << endl;
    cout << "================" << endl;

// calls function a_sort that sorts students by average
    a_sort(course);
    cout << "================" << endl;
    cout << "Course Report: First Name Order" << endl;
    cout << "================" << endl;

// calls function n_sort that sorts students by first name
    n_sort(course);
    cout << "================" << endl;
    cout << endl;
    cout << "================" << endl;
    cout << "Statistics" << endl;
    cout << "================" << endl;
    cout << "Number of students: " << index << endl;
// calls function class_avg that calculates the class average and ouputs
    cout << "Class Average: " << class_avg(course) << endl;
// calls function histogram that prints out grade distribution
    cout << "Grade Distribution (histogrampy)" << endl;
    histogram(course);
    cout << "================" << endl;
    cout << endl;
    cout << "================" << endl;

// calls function rec_finder that finds a student in a course
    rec_finder(course);

}

// function calculates average for a given student
double calc_average(double s1, double s2, double s3, double s4, double s5, double m1, double m2, double f)
{
    vector<double> s = {s1 , s2, s3, s4, s5};
    double s_total = 0, s_average = 0, end_average = 0;
    sort(s.rbegin(), s.rend());
    s.pop_back();
    for(int i = 0; i < s.size(); i++)
    {
      s_total += s[i];
    }
    s_average = (s_total / s.size()) / 10.0;
    end_average = (s_total * .20) + (m1 * .20) + (m2 * .20) + (f * .40);

    return end_average;
}

// funtion ranks students
void label_rank(vector<Student> &s)
{
    int rank = 2;
    Student avg_Top;
    for (int j = 0; j < s.size() - 1; j++){
      for (int i = j + 1; i < s.size(); i++){
        if (s[j].getAverage() < s[i].getAverage()){
          avg_Top = s[j];
          s[j] = s[i];
          s[i] = avg_Top;
        }
      }
    }
    s[0].setRank(1);
    for (int i = 1; i < s.size(); i++)
    {
      if (s[i].getAverage() < s[i-1].getAverage())
      {
        s[i].setRank(rank);
      }
      else if (s[i].getAverage() == s[i-1].getAverage())
      {
        s[i].setRank(s[i-1].getRank());
      }
      rank++;
    }
}

// funtion sorts students by average
void a_sort(vector<Student> &s)
{
    Student avg_Top;
    for (int j = 0; j < s.size() - 1; j++){
      for (int i = j + 1; i < s.size(); i++){
        if (s[j].getAverage() < s[i].getAverage()){
          avg_Top = s[j];
          s[j] = s[i];
          s[i] = avg_Top;
        }
        else if (s[j].getAverage() == s[i].getAverage()){
          if (s[j].getID() < s[i].getID()){
            avg_Top = s[j];
            s[j] = s[i];
            s[i] = avg_Top;
          }
        }
      }
    }
    for(int a = 0; a < s.size(); a++){
      s[a].print();
    }
}

// fuction sorts sudents by first name
void n_sort(vector<Student> &s)
{
    Student avg_Top;
    for (int j = 0; j < s.size() - 1; j++){
      for (int i = j + 1; i < s.size(); i++){
        if (s[j].getName() > s[i].getName()){
          avg_Top = s[j];
          s[j] = s[i];
          s[i] = avg_Top;
        }
        else if (s[j].getName() == s[i].getName()){
          if (s[j].getID() < s[i].getID()){
            avg_Top = s[j];
            s[j] = s[i];
            s[i] = avg_Top;
          }
        }
      }
    }
    for(int a = 0; a < s.size(); a++){
      s[a].print();
    }
}

// function calculates class average
double class_avg(vector<Student> &s)
{
    double c_total = 0, c_average = 0;
    for(int i = 0; i < s.size(); i++){
      c_total += s[i].getAverage();
    }
    c_average = c_total / s.size();
    return c_average;

}

// function creates histogram
void histogram(vector<Student> &s)
{
    int a_count = 0, b_count = 0, c_count = 0, d_count = 0, f_count = 0;
    for (int i = 0; i < s.size(); i++){
      if(s[i].getGrade() == 'A'){
        a_count++;
      }
      if(s[i].getGrade() == 'B'){
        b_count++;
      }
      if(s[i].getGrade() == 'C'){
        c_count++;
      }
      if(s[i].getGrade() == 'D'){
        d_count++;
      }
      if(s[i].getGrade() == 'D'){
        f_count++;
      }
    }
    cout << "A ";
    for(int i = 0; i < a_count; i++){
      cout << "* ";
    }
    cout << endl;
    cout << "B ";
    for(int i = 0; i < b_count; i++){
      cout << "* ";
    }
    cout << endl;
    cout << "C ";
    for(int i = 0; i < c_count; i++){
      cout << "* ";
    }
    cout << endl;
    cout << "D ";
    for(int i = 0; i < d_count; i++){
      cout << "* ";
    }
    cout << endl;
    cout << "F ";
    for(int i = 0; i < f_count; i++){
      cout << "* ";
    }
    cout << endl;
}

// function allows user to search for a specific student
void rec_finder(vector<Student> &s)
{
     char opt;
     string find_student;
     bool student_found = false;
    do{
      cout << "Record Finder: Enter the name of a student: ";
      cin >> find_student;
      cout << "================" << endl;
      for(int i = 0; i < s.size(); i++){
        if (s[i].getName() == find_student){
          student_found = true;
          s[i].print();
          cout<<endl;
          cout << "================" << endl;
        }

        }
      if(student_found == false){
        cout << "Failed. " << find_student << " is not enrolled in the class." << endl;
      }

      cout << "Do you want to continue? (y/n): ";
      cin >> opt;
      opt = toupper(opt);
      if (opt == 'N'){
        cout << "================" << endl;
        cout << "Done."<< endl;
      }
    }
    while( opt == 'Y');
}

Student.cpp

#include "Student.h"
#include <iostream>
using namespace std;

// default constructor
Student::Student(){
}

// method sets student name
void Student::setName(string name){
this->name = name;

}

// method sets student id
void Student::setID(int id){
this->id = id;

}

// method sets student average
void Student::setAverage(int average){
this->average = average;

if( average >= 90 )
{
    setGrade('A');
}
else if( 90 > average && average >= 80 )
{
    setGrade('B');
}
else if( 80 > average && average >= 70 )
{
    setGrade('C');
}
else if( 70 > average && average >= 60 )
{
    setGrade('D');
}
else if( 60 > average )
{
    setGrade('F');
}
}

// method sets student grade
void Student::setGrade(char grade){
this->grade = grade;

}

// method sets student rank
void Student::setRank(int rank){
this->rank = rank;

}

// method gets student name
string Student::getName() const{
return name;

}

// method gets student id
int Student::getID() const{
return id;

}

// method gets student average
double Student::getAverage() const{
return average;

}

// method gets student grade
char Student::getGrade() const{
return grade;

}

// method gets student rank
int Student::getRank() const{
return rank;

}

// method prints sudent info
void Student::print() const{
cout << name << " " << id << " - " << average << " (" << grade << ") (rank: " << rank << ")" << endl;
}

Student.h

#ifndef STUDENT_H
#define STUDENT_H
#include <iostream>
using namespace std;
class Student
{
private:
    string name;
    int id;
    double average;
    char grade;
    int rank;
public:
    Student();
    void setName(string name);
    void setID(int id);
    void setAverage(int average);
    void setGrade(char grade);
    void setRank(int rank);
    string getName() const;
    int getID() const;
    double getAverage() const;
    char getGrade() const;
    int getRank() const;
    void print() const;

};
#endif

students.txt

4
Sarah 1000 9.5 9.0 8.5 8.0 8.5 87.0 92.5 86.0
Syle 1001 9.6 9.1 8.6 8.1 8.5 87.1 92.6 86.1
Ronny 1056 9.5 9.0 8.5 8.0 8.5 87.0 92.5 100.0
Ronty 1979 9.5 9.0 8.5 8.0 8.5 87.0 92.5 100.0