Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Rewrite the addStudent function in C++ so that the Course class in the attached file to throw a runtime_error if the number of students exceeds the capacity. (please include complete written c++ code).thanks

[画像:```cpp #include <iostream> #include "Course.h" using namespace std; Course::Course(const string& courseName, int capacity) { numberOfStudents = 0; this->courseName = courseName; this->capacity = capacity; students = new string[capacity]; } Course::~Course() { delete[] students; } string Course::getCourseName() const { return courseName; } void Course::addStudent(const string& name) { students[numberOfStudents] = name; numberOfStudents++; } void Course::dropStudent(const string& name) { // Left as an exercise } string* Course::getStudents() const { return students; } int Course::getNumberOfStudents() const { return numberOfStudents; } ``` ### Explanation: This C++ code is a basic implementation of a `Course` class, which manages a simple list of students enrolled in a course. Below is an overview of its structure and functionality: 1. **Includes and Namespace:** - Includes the necessary input/output stream header `<iostream>`. - Includes a header file `"Course.h"` that likely contains the class declaration. - Uses the standard namespace with `using namespace std;`. 2. **Constructor (`Course::Course`):** - Initializes a course with a name and a capacity for students. - Sets the initial number of students to zero. - Allocates memory for storing student names based on the course capacity. 3. **Destructor (`Course::~Course`):** - Frees the allocated memory for the students' list. 4. **Method `getCourseName`:** - Returns the name of the course. 5. **Method `addStudent`:** - Adds a student to the course by their name. - Increments the count of enrolled students. 6. **Method `dropStudent`:** - Placeholder for removing a student by name; actual implementation is left as an exercise. 7. **Method `getStudents`:** - Returns a pointer to the array of student names. 8. **Method `getNumberOfStudents`:** - Returns the current number of enrolled students. This example demonstrates basic memory management and object-oriented programming concepts in C++.]
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Transcribed Image Text:```cpp #include <iostream> #include "Course.h" using namespace std; Course::Course(const string& courseName, int capacity) { numberOfStudents = 0; this->courseName = courseName; this->capacity = capacity; students = new string[capacity]; } Course::~Course() { delete[] students; } string Course::getCourseName() const { return courseName; } void Course::addStudent(const string& name) { students[numberOfStudents] = name; numberOfStudents++; } void Course::dropStudent(const string& name) { // Left as an exercise } string* Course::getStudents() const { return students; } int Course::getNumberOfStudents() const { return numberOfStudents; } ``` ### Explanation: This C++ code is a basic implementation of a `Course` class, which manages a simple list of students enrolled in a course. Below is an overview of its structure and functionality: 1. **Includes and Namespace:** - Includes the necessary input/output stream header `<iostream>`. - Includes a header file `"Course.h"` that likely contains the class declaration. - Uses the standard namespace with `using namespace std;`. 2. **Constructor (`Course::Course`):** - Initializes a course with a name and a capacity for students. - Sets the initial number of students to zero. - Allocates memory for storing student names based on the course capacity. 3. **Destructor (`Course::~Course`):** - Frees the allocated memory for the students' list. 4. **Method `getCourseName`:** - Returns the name of the course. 5. **Method `addStudent`:** - Adds a student to the course by their name. - Increments the count of enrolled students. 6. **Method `dropStudent`:** - Placeholder for removing a student by name; actual implementation is left as an exercise. 7. **Method `getStudents`:** - Returns a pointer to the array of student names. 8. **Method `getNumberOfStudents`:** - Returns the current number of enrolled students. This example demonstrates basic memory management and object-oriented programming concepts in C++.
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