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#
Authors:
Walter Savitch ,julia Lobur
Chapter:
Defining Classes
Exercise:
Programming Projects
Question:1 | ISBN:9780321531346 | Edition: 7

Question

Write a grading program for a class with the following grading policies:

a. There are two quizzes, each graded on the basis of 10 points.

b. There is one midterm exam and one final exam, each graded on the

basis of 100 points.

c. The final exam counts for 50% of the grade, the midterm counts for

25%, and the two quizzes together count for a total of 25%. (Do not

forget to normalize the quiz scores. They should be converted to a

percent before they are averaged in.) Any grade of 90 or more is an A, any grade of 80 or more (but less than 90) is a B, any grade of 70 or more (but less than 80) is a C, any grade of 60 or more (but less than 70) is a D, and any grade below 60 is an F.

The program will read in the student’s scores and output the student’s

record, which consists of two quiz and two exam scores as well as the

student’s average numeric score for the entire course and the final letter

grade. Define and use a structure for the student record. If this is a class

assignment, ask your instructor if input/output should be done with the

keyboard and screen or if it should be done with files. If it is to be done

with files, ask your instructor for instructions on file names.er variable.

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Answer 

#include <iostream> 
#include <iomanip> 
#include <string> 
using namespace std; 
 //Create structure
struct StudentGrade 
{ 
int quiz1; 
int quiz2; 
int midterm; 
int final; 
int total; 
string firstName; 
string lastName; 
double percent, avg; 
char letterGrade; 
}; 
 //Prototypes functions
void getData(StudentGrade& g); 
void setLetterGrade(StudentGrade& g); 
void format(int n); 
 
#define W(i) setw(17) 
#define Y(i) setw(10) 
 
int main() 
{ 
char run_again; 
 
 do 
{ 
  StudentGrade g; 
  getData(g); 
 
  const double Q_PERCENT = 12.5; 
  const double M_PERCENT = 25.0; 
  const double F_PERCENT = 50.0; 
  const int Q_SCORE = 10; 
  const int E_SCORE = 100; 
 
  double q1 = double(g.quiz1) / Q_SCORE * Q_PERCENT; 
  double q2 = double(g.quiz2) / Q_SCORE * Q_PERCENT; 
  double m = double(g.midterm) / E_SCORE * M_PERCENT; 
  double f = double(g.midterm) / E_SCORE * F_PERCENT; 
 
  g.total = g.quiz1 + g.quiz2 + g.midterm + g.final; 
  g.percent = q1 + q2 + m + f; 
 
  int tScore = Q_SCORE * 2 + E_SCORE * 2; 
  double tPercent = Q_PERCENT * 2 + M_PERCENT + F_PERCENT; 
 
  setLetterGrade(g); 
 
  format(1); 
  cout << endl << endl; 
  cout << "Here are the results for " << g.firstName << " " << g.lastName << "." << endl; 
  cout << Y(i) << "TEST" << Y(i) << "TEST" << Y(i) << "MAX" << W(i) << "GRADE SCORE" 
   << W(i) << "MAXIMUM SCORE" << endl; 
  cout << Y(i) << "PERIOD" << Y(i) << "SCORE" << Y(i) << "SCORE" << W(i) << "DISTRIBUTION" 
   << W(i) << "DISTRIBUTION" << endl << endl; 
  cout << Y(i) << "Quiz 1" << Y(i) << g.quiz1 << Y(i) << Q_SCORE << W(i) << q1 << "%" 
   << W(i) << Q_PERCENT << "%" << endl; 
  cout << Y(i) << "Quiz 2" << Y(i) << g.quiz2 << Y(i) << Q_SCORE << W(i) << q2 << "%" 
   << W(i) << Q_PERCENT << "%" << endl; 
  cout << Y(i) << "Midterm" << Y(i) << g.midterm << Y(i) << E_SCORE << W(i) << m << "%" 
   << W(i) << M_PERCENT << "%" << endl; 
  cout << Y(i) << "Final" << Y(i) << g.final << Y(i) << E_SCORE << W(i) << f << "%" 
   << W(i) << F_PERCENT << "%" << endl; 
  cout << Y(i) << "_______________________________________________________________________\n"; 
  cout << Y(i) << "TOTAL" << Y(i) << g.total << Y(i) << tScore << W(i) << g.percent << "%" 
   << W(i) << tPercent << "%" << endl; 
 
  cout << Y(i) << "Average" << Y(i) << (double(g.total) / tScore * tPercent) << "%" << endl; 
  cout << Y(i) << "Grade: " << Y(i) << g.letterGrade << endl; 
 
  cout << endl << endl; 
  cout << "Would you like to try again for another student? (y/n) : "; 
  cout << "(enter Y or N)"; 
  cout << endl; 
  cin >> run_again; 
  } while ((run_again == 'y') || (run_again == 'Y')); 
  system("pause"); 
  return 0; 
 
} 
 //getData method
void getData(StudentGrade& g) 
{ 
cout << "Enter the student's first name: "; 
cin >> g.firstName; 
cout << "Enter the student's last name: "; 
cin >> g.lastName; 
cout << "Enter Quiz 1 score (maximum is 10): "; 
cin >> g.quiz1; 
cout << "Enter Quiz 2 score (maximum is 10): "; 
cin >> g.quiz2; 
cout << "Enter Midterm score (maximum is 100): "; 
cin >> g.midterm; 
cout << "Enter Final score (maximum is 100): "; 
cin >> g.final; 
 
 g.quiz1 = g.quiz1 > 10 ? 10 : g.quiz1; 
g.quiz1 = g.quiz1 < 0 ? 0 : g.quiz1; 
g.quiz2 = g.quiz2 > 10 ? 10 : g.quiz2; 
g.quiz2 = g.quiz2 < 0 ? 0 : g.quiz2; 
g.midterm = g.midterm > 100 ? 100 : g.midterm; 
g.midterm = g.midterm < 0 ? 0 : g.midterm; 
g.final = g.final > 100 ? 100 : g.final; 
g.final = g.final < 0 ? 0 : g.final; 
 
 return; 
} 
 //setLetterGrade method
void setLetterGrade(StudentGrade& g) 
{ 
if (g.percent >= 90.0) 
  g.letterGrade = 'A'; 
else if (g.percent >= 80.0) 
  g.letterGrade = 'B'; 
else if (g.percent >= 70.0) 
  g.letterGrade = 'C'; 
else if (g.percent >= 60.0) 
  g.letterGrade = 'D'; 
else 
  g.letterGrade = 'F'; 
} 
 //format method
void format(int n) 
{ 
cout.setf(ios::fixed); 
cout.setf(ios::showpoint); 
cout.precision(n); 
}

Result output:

 

0 0

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