Hexagon School Grading System Code 1

grading.cpp

#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;

// Revision 6 by SRD_67

const int MAX_TOTAL_STUDENTS = 20; // Maximum of Students in Total
const int MAX_TOTAL_SUBJECTS = 10; // Maximum of Subjects in Total

void purge(char* students[], int stud_count) {
    for (int i = 0; i < stud_count; ++i)
    {
        delete[] students[i]; // Purge all Students in Memory
    }
}

string failmessage() {
    // A message to student that fails
    string messages[] = {
        "My son so dumb IQ 21 He try to make friends but they call him ching chong",
        "You are a failure",
        "You are a disgrace to your asian family",
        "I have no dumb child",
        "Your friends are smarter than you"
    };

    int randomIndex = rand() % (sizeof(messages) / sizeof(messages[0]));

    return messages[randomIndex];
}

float calculateGPA(float score) {
    // Hexagon School based Final Grades
    float gpa;
    if (score >= 98.0 && score <= 100.0) {
        gpa = 1.00;
    } else if (score >= 95.0 && score <= 97.0) {
        gpa = 1.25;
    } else if (score >= 92.0 && score <= 94.0) {
        gpa = 1.50;
    } else if (score >= 89.0 && score <= 91.0) {
        gpa = 1.75;
    } else if (score >= 86.0 && score <= 88.0) {
        gpa = 2.00;
    } else if (score >= 83.0 && score <= 85.0) {
        gpa = 2.25;
    } else if (score >= 80.0 && score <= 82.0) {
        gpa = 2.50;
    } else if (score >= 77.0 && score <= 79.0) {
        gpa = 2.75;
    } else if (score >= 75.0 && score <= 76.0) {
        gpa = 3.00;
    } else {
        gpa = 5.00;
    }
    return gpa;
}

int main() {
    char* students[MAX_TOTAL_STUDENTS];
    int stud_count = 0;
    char stud_name[100]; // Max of 100 characters in Student's name

    char* subjects[MAX_TOTAL_SUBJECTS];
    int sub_count = 0;
    char sub_name[100]; // Max of 100 characters in Subject's name

    char choice;
    // Start of student/subject input loop
    do {
        stud_count = 0; // Reset student count
        sub_count = 0; // Reset subject count

        cout << "Enter student names. Type 'f' to finish.\n";
        do {
            cout << stud_count + 1 << ": ";
            cin.getline(stud_name, 100); // Input student name
            
            if (strcasecmp(stud_name, "f") == 0) {
                break;
            }
            
            bool isValidInput = false;
            for (int i = 0; stud_name[i] != '\0'; ++i) {
                if (!isspace(stud_name[i])) {
                    isValidInput = true;
                    break;
                }
            }
            
            if (isValidInput) {
                students[stud_count] = new char[strlen(stud_name) + 1];
                strcpy(students[stud_count], stud_name);
                stud_count++;
            } else {
                cout << "Invalid input. Please enter a non-blank/non-whitespace name." << endl;
            }
        } while (stud_count < MAX_TOTAL_STUDENTS);

        cout << "\nList of students:\n";
        for (int i = 0; i < stud_count; ++i)
        {
            cout << i + 1 << ". " << students[i] << endl;
        }
        
        cout << "\nEnter subjects. Type 'f' to finish.\n";
        do {
            cout << sub_count + 1 << ": ";
            cin.getline(sub_name, 100); // Input subject name

            if (strcasecmp(sub_name, "f") == 0) {
                break;
            }
            
            bool isValidInput = false;
            for (int i = 0; sub_name[i] != '\0'; ++i) {
                if (!isspace(sub_name[i])) {
                    isValidInput = true;
                    break;
                }
            }
            
            if (isValidInput) {
                subjects[sub_count] = new char[strlen(sub_name) + 1];
                strcpy(subjects[sub_count], sub_name);
                sub_count++;
            } else {
                cout << "Invalid input. Please enter a non-blank/non-whitespace name." << endl;
            }

        } while (sub_count < MAX_TOTAL_SUBJECTS);
        
        cout << "\nList of subjects:\n";
        for (int i = 0; i < sub_count; ++i)
        {
            cout << i + 1 << ". " << subjects[i] << endl;
        }

        cout << "Are you sure this is correct? [Only the first character is noted as your answer]\n"; // Prompt user if everything students and subjects are correct
        cout << "Press 'y' to continue or 'n' to start over.\n";        
		choice = cin.get();
		cin.ignore(256, '\n');

        while (choice != 'n' && choice != 'y' && choice != 'N' && choice != 'Y') {
            cout << "Invalid choice. Please enter 'y' or 'n' [Only the first character is noted as your answer]." << endl;
            choice = cin.get();
			cin.ignore(256, '\n');
        }

        if (choice == 'n' || choice == 'N') {
            purge(students, stud_count);
            purge(subjects, sub_count);
            cin.clear();
            cin.ignore();
        }

    } while (choice == 'n' || choice == 'N');

    for (int i = 0; i < stud_count; ++i) {
        cout << "Enter scores for " << students[i] << endl;
        for (int j = 0; j < sub_count; ++j) {
            float score;
            cout << subjects[j] << ": ";
            cin >> score;

            // Input validation
            while (score < 0 || score > 100) {
                cout << "Invalid score. Please enter a score between 0 and 100." << endl;
                cin.clear(); // Clear the error state
                cout << subjects[j] << ": ";
                cin >> score;
            }

            cout << "GPA: " << calculateGPA(score) << endl;
            if (calculateGPA(score) == 5.00) {
                cout << failmessage() << endl;
            }
        }
    }

    // Deallocate memory
    purge(students, stud_count);

    return 0;
}