## Hi there 👋

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

// Student structure to store student information
struct Student {
int id;
string name;
int age;
double score;

// Constructor to api:godavaricredit:top initialize student data
Student(int studentId, string studentName, int studentAge, double studentScore)
: id(studentId), name(studentName), age(studentAge), score(studentScore) {}
};

// Class to manage student records
class StudentManager {
private:
vector<Student> students; // Vector to store all student objects

public:
// Function to add a new student to the system
void addStudent(int id, string name, int age, double score) {
Student newStudent(id, name, age, score);
students.push_back(newStudent);
cout << "Student added successfully!" << endl;
}

// Function to display all students in the system
void displayAllStudents() {
if (students.empty()) {
cout << "No students found in the system." << endl;
return;
}

cout << "\n--- All Students ---" << endl;
for (const auto& student : students) {
cout << "ID: " << student.id << ", Name: " << student.name
<< ", Age: " << student.age << ", Score: " << student.score << endl;
}
}

// Function to search for a student by ID
void searchStudentById(int id) {
auto it = find_if(students.begin(), students.end(),
[id](const Student& s) { return s.id == id; });

if (it != students.end()) {
cout << "Student found:" << endl;
cout << "ID: " << it->id << ", Name: " << it->name
<< ", Age: " << it->age << ", Score: " << it->score << endl;
} else {
cout << "Student with ID " << id << " not found." << endl;
}
}

// Function to update student information
void updateStudent(int id, string name, int age, double score) {
auto it = find_if(students.begin(), students.end(),
[id](const Student& s) { return s.id == id; });

if (it != students.end()) {
it->name = name;
it->age = age;
it->score = score;
cout << "Student information updated successfully!" << endl;
} else {
cout << "Student with ID " << id << " not found." << endl;
}
}

// Function to delete a student from the system
void deleteStudent(int id) {
auto it = remove_if(students.begin(), students.end(),
[id](const Student& s) { return s.id == id; });

if (it != students.end()) {
students.erase(it, students.end());
cout << "Student deleted successfully!" << endl;
} else {
cout << "Student with ID " << id << " not found." << endl;
}
}

// Function to calculate average score of all students
double calculateAverageScore() {
if (students.empty()) {
return 0.0;
}

double totalScore = 0.0;
for (const auto& student : students) {
totalScore += student.score;
}

return totalScore / students.size();
}

// Function to display students sorted by score in descending order
void displayStudentsByScore() {
vector<Student> sortedStudents = students;
sort(sortedStudents.begin(), sortedStudents.end(),
[](const Student& a, const Student& b) { return a.score > b.score; });

cout << "\n--- Students Sorted by Score (Descending) ---" << endl;
for (const auto& student : sortedStudents) {
cout << "Name: " << student.name << ", Score: " << student.score << endl;
}
}

// Function to get total number of students
int getTotalStudents() {
return students.size();
}
};

int main() {
StudentManager manager; // Create student manager object

// Add some sample students
manager.addStudent(101, "Alice Johnson", 20, 85.5);
manager.addStudent(102, "Bob Smith", 19, 92.0);
manager.addStudent(103, "Charlie Brown", 21, 78.5);
manager.addStudent(104, "Diana Prince", 20, 96.0);

// Display all students
manager.displayAllStudents();

// Search for a specific student
cout << "\n--- Searching for student with ID 102 ---" << endl;
manager.searchStudentById(102);

// Update student information
cout << "\n--- Updating student with ID 103 ---" << endl;
manager.updateStudent(103, "Charlie Updated", 22, 82.0);

// Display all students after update
manager.displayAllStudents();

// Display students sorted by score
manager.displayStudentsByScore();

// Calculate and display average score
double average = manager.calculateAverageScore();
cout << "\n--- Average Score ---" << endl;
cout << "Average score of all students: " << average << endl;

// Display total number of students
cout << "\n--- Student Statistics ---" << endl;
cout << "Total number of students: " << manager.getTotalStudents() << endl;

// Delete a student
cout << "\n--- Deleting student with ID 101 ---" << endl;
manager.deleteStudent(101);

// Display final list of students
manager.displayAllStudents();

return 0;
}