Question

Please program in C++ and document the code as you go so I can understand what you did for example ///This code does~

Your help is super appreciated. Ill make sure to like and review to however the best answer needs.

Overview

You will revisit the program that you wrote for Assignment 2 and add functionality that you developed in Assignment 3. Some additional functionality will be added to better the reporting of the students’ scores. There will be 11 students total.

Specifications

The grading scheme is: Test #1 -- 25% Test #2 -- 25% Test #3 -- 25% Test #4 -- 25% The student data is stored in a "students.txt" file that has all of the students’ names and test scores. The file has the following configuration: (first name) (last name) (Test1) (Test2) (Test3) (Test4)

Requirements

Create a "grades.txt" file that has a detailed summary of the final grades for each student. The file should have the following configuration:

1) Header with last name, first name, test scores, and final grade

2) A list of all student in alphabetical order by last name along with their test scores and final grade

3) A concluding summary with the following data: a) average score b) min score c) max score Formatting: last name - 15 character field, left justified first name - 15 character field, left justified score/grade - 7 character field, right justified, decimal format, one decimal place, decimal always shown The final grades must be calculated using the above mentioned grading scheme. The following files are given to test your program: "students.txt" – input file "grades.txt" - output file

Submission

You will submit one file for credit: assignment4.cpp - your Assignment 4 source code

Last Name      First Name      Test 1 Test 2 Test 3 Test 4  Grade
Chambler       Tara              81.0   74.0   95.0   91.0   85.2
Dixon          Daryl             89.0   95.0   90.0   99.0   93.2
Espinosa       Rosita            88.0   90.0   93.0   92.0   90.8
Greene         Maggie            85.0   82.0   94.0   90.0   87.8
Greene         Beth              75.0   82.0   89.0   81.0   81.8
Grimes         Carl              75.0   84.0   92.0   89.0   85.0
Grimes         Rick              92.0   96.0   85.0  100.0   93.2
Peletier       Carol             84.0   91.0   89.0   95.0   89.8
Porter         Eugene            96.0   98.0  100.0   95.0   97.2
Rhee           Glenn             94.0   99.0   97.0   95.0   96.2
Williams       Sasha             79.0   84.0   90.0   95.0   87.0

Mean = 89.8
Min  = 81.8
Max  = 97.2

Daryl Dixon 89 95 90 99
Rick Grimes 92 96 85 100
Glenn Rhee 94 99 97 95
Maggie Greene 85 82 94 90
Carl Grimes 75 84 92 89
Carol Peletier 84 91 89 95
Beth Greene 75 82 89 81
Sasha Williams 79 84 90 95
Tara Chambler 81 74 95 91
Rosita Espinosa 88 90 93 92
Eugene Porter 96 98 100 95

edit: previous code sorry about that.

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cmath>

using namespace std;

/// Declare global constants
const char* IN_FILE_NAME = "stats.txt";
const char* OUT_FILE_NAME = "results.txt";
const int ELEMENTS = 100;

/// Function Prototypes
bool getTrialElements(ifstream&, double[], int);
void sortElements(double[], int);
double findMean(double[], int);
double findMedian(double[], int);
double findMinimum(double[], int);
double findMaximum(double[], int);
double findStdDev(double[], int);
void printTrialResults(ofstream&, int, double[], int);

/// This program uses basic statistics with set of data points
int main()
{
/// Declare variables
ifstream inFile;
ofstream outFile;
int trialNumber = 0;
double elementArray[ELEMENTS];

/// Open input and output files
inFile.open(IN_FILE_NAME);
outFile.open(OUT_FILE_NAME);

/// Loop through all of the data sets in the file
while(getTrialElements(inFile, elementArray, ELEMENTS))
{
/// Keep track of the number of data sets processed
trialNumber++;
/// Output the results to the output file
printTrialResults(outFile, trialNumber, elementArray, ELEMENTS);
}

/// Close input and output files
outFile.close();
inFile.close();

return 0;
}

bool getTrialElements(ifstream& fin, double array[], int size)
{
int i;
for(i = 0; i < 100 && !fin.eof(); i++) //Read all element.
fin >> array[i];
if(i != 100) //If the trial doesn't have 100 elements
return false; //Return false.
return true; //Return true if not.
}
void sortElements(double array[], int size) //sorts
{
for(int i = 0; i < size-1; i++)
for(int j = 0; j < size-i-1; j++)
if(array[j] < array[j+1])
{
double temp = array[j];
array[j] = array[j+1];
array[j+1] = temp;
}
}
double findMean(double array[], int size) //the mean
{
double sum = 0;
for(int i = 0; i < size; i++)
sum += array[i];
return sum / size;
}
double findMedian(double array[], int size) //the median
{
sortElements(array, size);
if(size % 2 == 0)
return (array[size/2] + array[size/2-1]) / 2.0;
return array[size/2];
}
double findMinimum(double array[], int size) //theMinimum
{
double min = array[0];
for(int i = 1; i < size; i++)
if(array[i] < min)
min = array[i];
return min;
}
double findMaximum(double array[], int size) //themaximum
{
double max = array[0];
for(int i = 1; i < size; i++)
if(array[i] > max)
max = array[i];
return max;
}
double findStdDev(double array[], int size) //stdDev
{
double stdDev = 0;
double avg = findMean(array, size);
for(int i = 0; i < size; i++)
stdDev += pow(array[i] - avg, 2);
stdDev = sqrt(1/(double)size * stdDev);
return stdDev;
}
void printTrialResults(ofstream&, int trialNumber, double array[], int size) //TrialResults displayed
{
cout << "trial " << setw(5) << left << trialNumber;
cout << "mean: " << setw(6) << left << fixed << setprecision(1) << findMean(array, size);
cout << "median: " << setw(6) << left << fixed << setprecision(1) << findMedian(array, size);
cout << "min: " << setw(6) << left << fixed << setprecision(1) << findMinimum(array, size);
cout << "max: " << setw(6) << left << fixed << setprecision(1) << findMaximum(array, size);
cout << "std dev: " << setw(6) << left << fixed << setprecision(1) << findStdDev(array, size);
cout << endl;
}

Answer 1

#include <iostream>

#include <iomanip>

#include <fstream>

#include <cmath>

using namespace std;

/// Declare global constants

const char* IN_FILE_NAME = "students.txt";

const char* OUT_FILE_NAME = "grades.txt";

const int SIZE = 100;

/// Defining structure

struct Student

{

                string fname, lname;

                double test[4];

                double grade;

};

/// Function Prototypes

int readFile(ifstream&, Student[]);

void findGrade(Student[], int);

double findMean(Student[], int);

void sortElements(Student[], int size);

double findMinimum(Student[], int);

double findMaximum(Student[], int);

void writeFile(ofstream&, Student[], int);

int main()

{

                /// Declare variables

                ifstream inFile;

                ofstream outFile;

                Student stud[SIZE];

                int n = 0;

               

                /// Open input and output files

                inFile.open(IN_FILE_NAME);

                outFile.open(OUT_FILE_NAME);

                /// Calling function to read input file

                n = readFile(inFile, stud);

                ///Calling function to calculate grade

                findGrade(stud, n);

                ///Calling function to write data into output file

                writeFile(outFile, stud, n);

                /// Close input and output files

                outFile.close();

                inFile.close();

                return 0;

}

///Function to read input file and

/// store data into structure

int readFile(ifstream& fin, Student array[])

{

                int i=0;

                while(!fin.eof())

                {

                                //Read all element

                fin >> array[i].fname >> array[i].lname;

                                for(int j=0; j<4; j++)                       

                                                fin >> array[i].test[j];

                               

                                i++;

                }

                return i; //Return number of students

}

//Function to calculate grade of students

void findGrade(Student array[], int size)

{

                for(int i=0; i<size; i++)

                {

                                array[i].grade=0;

                                for(int j=0; j<4; j++)                       

                                {

                                                array[i].grade += array[i].test[j]*0.25;

                                }

                }

}

///Function to sort the array of students by last name

void sortElements(Student array[], int size) //sorts

{

                for(int i = 0; i < size-1; i++)

                                for(int j = 0; j < size-i-1; j++)

                                                if(array[j].lname > array[j+1].lname)

                                                {

                                                                Student temp = array[j];

                                                                array[j] = array[j+1];

                                                                array[j+1] = temp;

                                                }                                             

}

//Function to find the mean of grades of students

double findMean(Student array[], int size) //the mean

{

                double sum = 0;

                                for(int i = 0; i < size; i++)

                                                sum += array[i].grade;

                return sum / size;

}

///Function to detemine minimum grade

double findMinimum(Student array[], int size) //theMinimum

{

                double min = array[0].grade;

                for(int i = 1; i < size; i++)

                                if(array[i].grade < min)

                                                min = array[i].grade;

               

                return min;

}

///Function to detemine maximum grade

double findMaximum(Student array[], int size) //themaximum

{

                double max = array[0].grade;

                for(int i = 1; i < size; i++)

                if(array[i].grade > max)

                                max = array[i].grade;

               

                return max;

}

///Function to write data into file

void writeFile(ofstream& fout, Student array[], int size) //TrialResults displayed

{

                fout<<left<<setw(15)<<"Last Name"<<left<<setw(15)<<"First Name"<<right<<setw(7)<<"Test1"

                    <<right<<setw(7)<<"Test2"<<right<<setw(7)<<"Test3"

                                <<right<<setw(7)<<"Test4"<<right<<setw(7)<<"Grade"<<endl;

                               

                sortElements(array, size);

                fout << setprecision(1) <<fixed;

                for(int i = 0; i < size; i++)

                {

                                fout<<left<<setw(15)<<array[i].lname<<left<<setw(15)<<array[i].fname;

                                for(int j=0; j<4; j++)       

                                                fout<<right<<setw(7)<<array[i].test[j];

                   

                                fout<<right<<setw(7)<<array[i].grade<<endl;

                }

                fout << endl;

                fout << "Mean = "<< findMean(array, size)<<endl;

                fout << "Min = " << findMinimum(array, size)<<endl;

                fout << "Max = " << findMaximum(array, size)<<endl;

}

Sample input file "students.txt":

Before executing above program you need to create "students.txt" file and store it into current working folder.

Content of output file "grades.txt" after executing program:-