Question

C++
Redo PROG8, a previous program using functions and/or arrays. Complete as many levels as you can. 

 Level 1: (20 points) Write FUNCTIONS for each of the following: a) Validate #students, #scores. b) Compute letter grade based on average. c) Display student letter grade. d) Display course average. 

 Level 2: (15 points) Use ARRAYS for each of the following. e) Read a student's scores into array. f) Calculate the student's average based on scores in array. g) Display the student's scores in the roll book. 

 Level 3: [15 points] write FUNCTIONS with ARRAY parameters for each of the following: f) Use the array to calculate the student's average. g) Use the array when you display the student's scores in the roll book

<iostream>

#include <fstream>

#include <cstring>

#include <cmath>

using namespace std;

  

int main()

{

int numStudents = 0; // # students in class.

int numScores = 0; // # scores per student.

int ID = 0; // Student id (4-digits).

int score = 0; // Student score.

int s = 0; // Loop control variable (#students).

int sumScores = 0; // Sum of scores for given student.

float avg = 0; // Average score for given student.

float savg = 0;

ifstream scoreF; // Input file stream - student scores.

ofstream avgF; // Output file stream -- averages

ofstream gradesF; // [revOutput stream -- formatted grade book.

  

//-| -------------------------------------------------------------------------------

//-| Display intellectual property copyright notice.

//-| -------------------------------------------------------------------------------

cout << endl << "(c) 2019 NAME" << endl << endl;

  

  

//-| -------------------------------------------------------------------------------

//-| Open input/output file streams. If input file can not be

//-| opened, display message and terminate.

//-| -------------------------------------------------------------------------------

scoreF.open("scores.dat");

if (scoreF.fail())

{

cout << "FILE 'scores.dat' CANNOT BE OPENED." << endl << endl;

exit(1);

}   

avgF.open("averages.dat");

gradesF.open("grades.rpt");

  

//-| --------------------------------------------------------------------------------

//-| Do what comes next. Don't forget to describe your algorithm

//-| as program comments.

//-| --------------------------------------------------------------------------------

  

  

//-| --------------------------------------------------------------------------------

//-| Read control data from scores file: #students and #scores.

//-| --------------------------------------------------------------------------------

scoreF >> numStudents >> numScores;

avgF << "STUDENT AVERAGES" << endl << endl;

gradesF << "COURSE GRADES REPORT" << endl << endl;

  

if(!(numStudents >=1 && numScores >=1))

{

cout << "INVALID #STUDENTS (" << numStudents << ") or #SCORES (" << numScores

<< ")" << endl;

exit(1);

}

else

{

  

//-| --------------------------------------------------------------------------------

//-| REPEAT: for each student, 1,2,3,..., numStudents:

//-| a) Read ID

//-| b) Sum each of the numScores scores

//-| c) Compute the average

//-| d) Write ID and aveage to averages file.

//-| --------------------------------------------------------------------------------

for (s=1; s <= numStudents; s++)

{

scoreF >> ID;

gradesF << setw(5) << left << ID << " ";

  

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

{

scoreF >> score; sumScores += score;

gradesF << setw(4) << right << score << " ";

}

avg = (float) sumScores / (float) numScores;

sumScores = 0;

  

gradesF << " " << setw(5) << right << setprecision(1)

<< fixed << avg << " ";

avgF << setprecision(1) << fixed << ID << " " << avg << endl;

savg += avg;

//-| ----------------------------------------------------------------------------------

//-| Note: At this point, all data have been read from the file.

//-| Make sure you did the work inside the repetition/loop

//-| structure.

//-| ----------------------------------------------------------------------------------

if(avg >= 90) {

cout << ID << " " << "grade = A" << endl;

gradesF << setw(2) << right << "A";

}

else if(avg >= 80 && avg < 90){

cout << ID << " " << "grade = B" << endl;

gradesF << setw(2) << right << "B";

}

else if(avg >= 70 && avg < 80){

cout << ID << " " << "grade = C" << endl;

gradesF << setw(2) << right << "C";

}

else if(avg >= 60 && avg < 70){

cout << ID << " " << "grade = D" << endl;

gradesF << setw(2) << right << "D";

  

}

else if(avg < 60){

cout << ID << " " << "grade = F" << endl;

gradesF << setw(2) << right << "F";

}

gradesF << endl << endl;

  

} // Forloop

  

} // Else

//-| ----------------------------------------------------------------------------------

//-| 2.

//-|-----------------------------------------------------------------------------------

cout << endl << "COURSE AVERAGE = " << setprecision(2) << fixed <<

(float) savg / numScores;

  

gradesF << "COURSE AVERAGE = " << setprecision(2)

<< fixed << (float) savg / numScores;

  

  

//-| ----------------------------------------------------------------------------------

//-| Close open file streams.

//-| ----------------------------------------------------------------------------------

scoreF.close();

avgF.close();

gradesF.close();

  

//-| ----------------------------------------------------------------------------------

//-| Display intellectual property copyright notice.

//-| ----------------------------------------------------------------------------------

cout << endl << endl << "(c) 2019, NAME" << endl << endl;

  

cout << "\n\n\nView output file 'averages.dat' \n\n";

system("pause");

return 0;

}

Answer 1

// scores.dat

4 5
111 89 98 87 98 89
222 90 98 87 98 87
333 54 67 78 65 56
444 76 65 55 87 78

________________________

// Level1)

#include <iostream>

#include <fstream>

#include <cstring>
#include <iomanip>

#include <cmath>

using namespace std;

  
bool validateStudentScore(int score);
char computeLetterGrade(double avg);
void displayCourseAverage(float savg,int numScores);
int main()

{

int numStudents = 0; // # students in class.

int numScores = 0; // # scores per student.

int ID = 0; // Student id (4-digits).

int score = 0; // Student score.

int s = 0; // Loop control variable (#students).

int sumScores = 0; // Sum of scores for given student.

float avg = 0; // Average score for given student.

float savg = 0;

ifstream scoreF; // Input file stream - student scores.

ofstream avgF; // Output file stream -- averages

ofstream gradesF; // [revOutput stream -- formatted grade book.

  

//-| -------------------------------------------------------------------------------

//-| Display intellectual property copyright notice.

//-| -------------------------------------------------------------------------------

cout << endl << "(c) 2019 NAME" << endl << endl;

  

  

//-| -------------------------------------------------------------------------------

//-| Open input/output file streams. If input file can not be

//-| opened, display message and terminate.

//-| -------------------------------------------------------------------------------

scoreF.open("scores.dat");

if (scoreF.fail())

{

cout << "FILE 'scores.dat' CANNOT BE OPENED." << endl << endl;

exit(1);

}   

avgF.open("averages.dat");

gradesF.open("grades.rpt");

  

//-| --------------------------------------------------------------------------------

//-| Do what comes next. Don't forget to describe your algorithm

//-| as program comments.

//-| --------------------------------------------------------------------------------

  

  

//-| --------------------------------------------------------------------------------

//-| Read control data from scores file: #students and #scores.

//-| --------------------------------------------------------------------------------

scoreF >> numStudents >> numScores;

avgF << "STUDENT AVERAGES" << endl << endl;

gradesF << "COURSE GRADES REPORT" << endl << endl;

  

if(!(numStudents >=1 && numScores >=1))

{

cout << "INVALID #STUDENTS (" << numStudents << ") or #SCORES (" << numScores

<< ")" << endl;

exit(1);

}

else

{

  

//-| --------------------------------------------------------------------------------

//-| REPEAT: for each student, 1,2,3,..., numStudents:

//-| a) Read ID

//-| b) Sum each of the numScores scores

//-| c) Compute the average

//-| d) Write ID and aveage to averages file.

//-| --------------------------------------------------------------------------------
int validCnt=0;
for (s=1; s <= numStudents; s++)

{
validCnt=0;
scoreF >> ID;

gradesF << setw(5) << left << ID << " ";

  

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

{

scoreF >> score;
bool b=validateStudentScore(score);
if(b)
{
sumScores += score;
validCnt++;  
}

gradesF << setw(4) << right << score << " ";

}

avg = (float) sumScores / (float) validCnt;

sumScores = 0;

  

gradesF << " " << setw(5) << right << setprecision(1)

<< fixed << avg << " ";

avgF << setprecision(1) << fixed << ID << " " << avg << endl;

savg += avg;

char letterGrade=computeLetterGrade(avg);

//-| ----------------------------------------------------------------------------------

//-| Note: At this point, all data have been read from the file.

//-| Make sure you did the work inside the repetition/loop

//-| structure.

//-| ----------------------------------------------------------------------------------

cout << ID << " " << "grade = "<<computeLetterGrade(avg) << endl;

gradesF << setw(2) << right << computeLetterGrade(avg);

gradesF << endl << endl;

  

} // Forloop

  

} // Else

//-| ----------------------------------------------------------------------------------

//-| 2.

//-|-----------------------------------------------------------------------------------

displayCourseAverage(savg,numScores);

  

gradesF << "COURSE AVERAGE = " << setprecision(2)

<< fixed << (float) savg / numScores;

  

  

//-| ----------------------------------------------------------------------------------

//-| Close open file streams.

//-| ----------------------------------------------------------------------------------

scoreF.close();

avgF.close();

gradesF.close();

  

//-| ----------------------------------------------------------------------------------

//-| Display intellectual property copyright notice.

//-| ----------------------------------------------------------------------------------

cout << endl << endl << "(c) 2019, NAME" << endl << endl;

  

cout << "\n\n\nView output file 'averages.dat' \n\n";

system("pause");

return 0;

}
bool validateStudentScore(int score)
{
   if(score<0 || score>100)
   return false;
   else
   return true;
}
char computeLetterGrade(double avg)
{
   char letterGrade;
   if(avg >= 90) {
       letterGrade='A';
   }
   else if(avg >= 80 && avg < 90){  
   letterGrade='B';
}
   else if(avg >= 70 && avg < 80){
       letterGrade='C';
   }
       else if(avg >= 60 && avg < 70){
           letterGrade='D';
       }
           else if(avg < 60){
               letterGrade='F';
           }
           return letterGrade;
}
void displayCourseAverage(float savg,int numScores)
{
   cout << endl << "COURSE AVERAGE = " << setprecision(2) << fixed <<(float) savg / numScores;
}

________________________

Output: (Console)

______________________