Students Structs

#include <iostream>
#include <string>
#include <set>
#include <algorithm>

using namespace std;

struct Student {
    string faculty_number;
    string name;
    double average_grade;
};

void input_students(Student *, size_t);
void output_students(Student *, size_t);
void print(const string&);
void output_sorted(Student*, size_t);
void output_excellent_grade_students(Student *, size_t);

int main() {
    // Declare test as pointer of Student structure
    size_t *number_of_students = new size_t;

    cout << "Enter number of students: ";
    cin >> *number_of_students;

    Student *students = new Student[*number_of_students];

    // Call input function
    input_students(students, *number_of_students);

    // Call output function
    output_students(students, *number_of_students);

    // Sort
    output_sorted(students, *number_of_students);

    output_excellent_grade_students(students, *number_of_students);

    // Free memory
    delete[] students, number_of_students;

    system("pause");
    return 0;
}

void input_students(Student *student, size_t number_of_students) {
    for(size_t i = 0; i < number_of_students; i++) {
        // Clear input stream and sync it
        cin.sync();
        cin.clear();

        cout << "Enter Student #" << i << " name: ";
        getline(cin, student[i].name);

        cout << "Enter Student #" << i << " faculty number: ";
        getline(cin, student[i].faculty_number);

        cout << "Enter Student #" << i << " average grade: ";
        cin >> student[i].average_grade;
    }
}

void output_students(Student *student, size_t number_of_students) {
    for(size_t i = 0; i < number_of_students; i++)
        cout << "\nStudent with faculty number " << student[i].faculty_number << " whose name is " << student[i].name << " has grade of " << student[i].average_grade << endl << endl;
}

void output_sorted(Student* student, size_t number_of_students) {
    set<string> sorted_string;

    for(size_t i = 0; i < number_of_students; i++) {
        sorted_string.insert(student[i].name);
    }

    for_each(sorted_string.begin(), sorted_string.end(), &print);
}

void print(const std::string& item)
{
    cout << item << endl;
}

void output_excellent_grade_students(Student *student, size_t number_of_students) {
    for(size_t i = 0; i < number_of_students; i++)
        if(student[i].average_grade >= 5.50)
            cout << "\nStudent with faculty number " << student[i].faculty_number << " whose name is " << student[i].name << " has grade of " << student[i].average_grade << endl << endl;
}