write the programme in c++ that do so mainy thing: 1) Search for student by ID:s

Question

write the programme in c++ that do so mainy thing:
1) Search for student by ID:system asks for student ID, if ID is valid, student’s name and his grade are displayed.
2)Search for Student by name:systems asks for student’s name, then it displays all students with that name, it displays ID, name, grades.
3)Search for students according to the average:system asks user to enter an average then it displays students whose average is equal or greater than that number (displays id, name, all grades, average).

Explanation / Answer

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

struct student {
    string name;
    int id;
    int grade;
    student* next;
};

void AddStudent(student* &list) {
    string _name;
    int _id;
    int _grade;
    cout << "Enter the student's name: ";
    cin >> _name;
    cout << "Enter the student's ID: ";
    cin >> _id;
    cout << "Enter the student's grade: ";
    cin >> _grade;
    cout << endl;
    student* temp = new student;
    temp->name = _name;
    temp->id = _id;
    temp->grade = _grade;
    temp->next = list;
    list = temp;
    cout << "Student added. ";
    system("pause");
};

void SearchByName(student* list) {
    if (list == NULL) cout << "There are no students in current database. ";
    else {
        string _name;
        cout << "Enter the name: ";
        cin >> _name;
        cout << endl;
        bool found = false;
        while (list!=NULL) {
            if (list->name == _name) {
                cout << "Name: " << list->name << " ID: " << list->id << " Grade: " << list->grade << endl << endl;
                found = true;
            };
            list = list->next;
        };
        if (!found) cout << "No students found. ";
    };
    system("pause");
};

void SearchByID(student* list) {
    if (list == NULL) cout << "There are no students in current database. ";
    else {
        int _id;
        cout << "Enter the ID: ";
        cin >> _id;
        cout << endl;
        bool found = false;
        while (list!=NULL) {
            if (list->id == _id) {
                cout << "Name: " << list->name << " ID: " << list->id << " Grade: " << list->grade << endl << endl;
                found = true;
            };
            list = list->next;
        };
        if (!found) cout << "No students found. ";
    };
    system("pause");
};

void SearchByAverage(student* list) {
    if (list == NULL) cout << "There are no students in current database. ";
    else {
        int _grade;
        cout << "Enter the average: ";
        cin >> _grade;
        cout << endl;
        bool found = false;
        cout << "Students whose grade is equal or greater: ";
        while (list!=NULL) {
            if (list->grade >= _grade) {
                cout << "Name: " << list->name << " ID: " << list->id << " Grade: " << list->grade << endl << endl;
                found = true;
            };
            list = list->next;
        };
        if (!found) cout << "No students found. ";
    };
    system("pause");
};

int MenuChoice() {
    cout << "Choose your action: 1) Enter new student 2) Search student by ID 3) Search student by name " <<
        "4) Search students by average 5) Exit ";
    int a;
    cin >> a;
    cout << endl;
    return a;
};

int main() {
    student* list = new student;
    list = NULL;
    bool flag = true;
    while (flag) {
        switch (MenuChoice()) {
            case 1:
                AddStudent(list);
                break;
            case 2:
                SearchByID(list);
                break;
            case 3:
                SearchByName(list);
                break;
            case 4:
                SearchByAverage(list);
                break;
            case 5:
                flag = false;
                break;
        };
    };
};

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