Question

Create a C++ program to calculate grades as well as descriptive statistics for a set of test scores. The test scores can be entered via a user prompt or through an external file. For each student, you need to provide a student name (string) and a test score (float). The program will do the followings:

Assign a grade (A, B, C, D, or F) based on a student’s test score.

Display the grade roster as shown below:

Name      Test Score     Grade

Kyle            90                   A

Matt            100                 A

Carl             93                   A

Calculate the following descriptive statistics:

Number of students in the class

Average score

Maximum score

Minimum score

Output example:

Number of students in the class: 3

Class Average: 94.3333

Maximum Test Score: 100

Minimum Test Score: 90

The program must use:

A loop structure (for-loop, while-loop, or do-while-loop)

Conditional processing (if-then-else)

Arrays

Classes and objects (separate theclass interface from the implementations)

Answer 1

Given below is the code for question. Please do rate the answer if it helped. Thank you.

student.h
--------
#ifndef STUDENT_H
#define STUDENT_H
#include
using namespace std;

class Student{
private:
string name;
double score;
public:
Student();
Student(string name1, double score1);
string getName();
double getScore();
char getGrade();
void setName(string s);
void setScore(double s);
};
#endif

student.cpp
-------
#include "student.h"
#include
using namespace std;

Student::Student(){
score = 0;
}

Student::Student(string name1, double score1){
name = name1;
score = score1;
}
void Student::setName(string s){
name = s;
}

void Student::setScore(double s){
score = s;
}
string Student::getName(){
return name;
}
double Student::getScore(){
return score;
}
char Student::getGrade(){
if(score >= 90)
return 'A';
else if(score >= 80)
return 'B';
else if(score >= 70)
return 'C';
else if(score >= 60)
return 'D';
else
return 'F';
}

student_main.cpp
-----
#include
#include
#include "student.h"
using namespace std;

int main(){
const int SIZE = 10;
Student s[SIZE];
int count = 0;
string choice;
string name;
double score;
double max, min, avg;

//input
do{
cout << "Enter name: ";
getline(cin, name);
cout << "Enter score: ";
cin >> score;
s[count].setName(name);
s[count].setScore(score);
count++;

cout << "Want to add another? (y/n): ";
cin >> choice;
cin.ignore(); //get rid of newline

}while(count < SIZE && ( choice == "y" || choice == "Y"));

max = min = s[0].getScore();
avg = 0;

for(int i = 0; i < count; i++){
if(s[i].getScore() > max)
max = s[i].getScore();
else if(s[i].getScore() < min)
min = s[i].getScore();
  
avg += s[i].getScore();
}

avg /= count;

cout << left << setw(15) << "Name" << setw(15) << "Score" << setw(15) << "Grade" << endl;

for(int i = 0; i < count; i++){
cout << setw(15) << s[i].getName() << setw(15) << s[i].getScore() << setw(15) << s[i].getGrade() << endl;
}

cout << endl;
cout << "Number of students: " << count << endl;
cout << "Class average: " << avg << endl;
cout << "Maximum score: " << max << endl;
cout << "Minimum score: " << min << endl;
return 0;
}

Enter name: Kyle Enter score: 90 Want to add another? (y/n): y Enter name: Matt Enter score: 100 Want to add another? (y/n): y Enter name: Carl Enter score: 93 Want to add another? (y/n): n Name Score Grade Kyle 90 Matt 100 Carl Number of students: 3 Class average: 94.3333 Maximum score: 100 Minimum score: 90