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  1. //Maxwell Brewer                   CS1A                  Chapter 11, p. 648, #12
  2. //
  3. /*******************************************************************************
  4.  * STUDENT GRADE CALCULATOR
  5.  * _____________________________________________________________________________
  6.  * This program collects information about students, including their names,
  7.  * ID numbers, and test scores. It calculates the average test score and assigns
  8.  * a letter grade based on the average.
  9.  * 
  10.  * INPUT:
  11.  *    - Number of students and number of tests per student.
  12.  *    - Each student’s name, ID number, and test scores.
  13.  * 
  14.  * OUTPUT:
  15.  *    - A summary table displaying each student’s name, ID, average score, 
  16.  *      and corresponding letter grade.
  17.  *******************************************************************************/
  18.  
  19. #include <iostream>
  20. #include <string>
  21.  
  22. using namespace std;
  23.  
  24. // Structure to store student information
  25. struct Student {
  26.     string name;
  27.     int ID;
  28.     int* testScores;
  29.     double average;
  30.     char grade;
  31. };
  32.  
  33. // Function prototypes
  34. double calculateAverage(const Student &student, int numTests);
  35. char determineLetterGrade(double average);
  36.  
  37. int main() {
  38.     // Variables to hold the number of students and tests
  39.     int numStudents, numTests;
  40.  
  41.     // Input number of students and tests
  42.     cout << "Enter the number of students: ";
  43.     cin >> numStudents;
  44.  
  45.     cout << "Enter the number of tests per student: ";
  46.     cin >> numTests;
  47.  
  48.     // Dynamic allocation of student array
  49.     Student* students = new Student[numStudents];
  50.  
  51.     // Input data for each student
  52.     cout << "\nEnter data for each student:\n";
  53.     for (int i = 0; i < numStudents; i++) {
  54.         cout << "\nStudent " << (i + 1) << ":\n";
  55.  
  56.         // Input student name
  57.         cout << "Name: ";
  58.         cin.ignore(); // Clear input buffer
  59.         getline(cin, students[i].name);
  60.  
  61.         // Validate name input
  62.         while (students[i].name.empty()) {
  63.             cout << "Name cannot be empty. Please enter the name: ";
  64.             getline(cin, students[i].name);
  65.         }
  66.  
  67.         // Input student ID
  68.         cout << "ID Number: ";
  69.         cin >> students[i].ID;
  70.  
  71.         // Allocate memory for test scores
  72.         students[i].testScores = new int[numTests];
  73.  
  74.         // Input test scores
  75.         for (int j = 0; j < numTests; j++) {
  76.             cout << "Test " << (j + 1) << ": ";
  77.             cin >> students[i].testScores[j];
  78.  
  79.             // Validate nonnegative test scores
  80.             while (students[i].testScores[j] < 0) {
  81.                 cout << "Test scores must be nonnegative. Enter again: ";
  82.                 cin >> students[i].testScores[j];
  83.             }
  84.         }
  85.  
  86.         // Calculate average and grade
  87.         students[i].average = calculateAverage(students[i], numTests);
  88.         students[i].grade = determineLetterGrade(students[i].average);
  89.     }
  90.  
  91.     // Display results
  92.     cout << "\n\nStudent Grade Report:\n";
  93.     cout << "-------------------------------------------\n";
  94.     cout << "Name\t\tID\t\tAverage\t\tGrade\n";
  95.     cout << "-------------------------------------------\n";
  96.  
  97.     for (int i = 0; i < numStudents; i++) {
  98.         cout << students[i].name << "\t\t" 
  99.              << students[i].ID << "\t\t" 
  100.              << students[i].average << "\t\t" 
  101.              << students[i].grade << "\n";
  102.     }
  103.  
  104.     // Free allocated memory
  105.     for (int i = 0; i < numStudents; i++) {
  106.         delete[] students[i].testScores;
  107.     }
  108.     delete[] students;
  109.  
  110.     return 0;
  111. }
  112.  
  113. /**
  114.  * Calculates the average test score for a student.
  115.  * 
  116.  * @param student The student whose average is to be calculated.
  117.  * @param numTests The number of tests the student has taken.
  118.  * @return The calculated average score as a double.
  119.  */
  120. double calculateAverage(const Student &student, int numTests) {
  121.     double total = 0;
  122.  
  123.     // Sum all test scores
  124.     for (int i = 0; i < numTests; i++) {
  125.         total += student.testScores[i];
  126.     }
  127.  
  128.     return total / numTests; // Calculate and return average
  129. }
  130.  
  131. /**
  132.  * Determines the letter grade based on the average score.
  133.  * 
  134.  * @param average The average score.
  135.  * @return The corresponding letter grade.
  136.  */
  137. char determineLetterGrade(double average) {
  138.     if (average >= 91) {
  139.         return 'A';
  140.     } else if (average >= 81) {
  141.         return 'B';
  142.     } else if (average >= 71) {
  143.         return 'C';
  144.     } else if (average >= 61) {
  145.         return 'D';
  146.     } else {
  147.         return 'F';
  148.     }
  149. }
Success #stdin #stdout 0.01s 5268KB
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https://ideone.com/qKp5Vy
Chapter 11, p. 648, #12
language:
C++ (gcc 8.3)
created:
16 hours ago
visibility:
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