Sorting students by grades

sortingStudentsByGrades.cpp

#include <iostream> 
#include <string>

struct Students 
{
    std::string name;
    int grade;
};

void sortNames(Students *students, int length)
{
    for(int start = 0; start < length; start++)
    {
        int max = start;
        for(int current = start + 1; current < length; current++)
        {
            if(students[current].grade > students[max].grade)
                max = current;  
        }
        std::swap(students[start], students[max]);
    }    
}

int main()
{
    
    int countStudents;
    do
    {
        std::cout << "How many students do you want to enter? ";
        std::cin >> countStudents;
    } while(countStudents <= 1);
    
    Students *students = new Students[countStudents];
    
    for(int idx = 0; idx < countStudents; ++idx) 
    {
        std::cout << "Enter name #" << idx + 1 << ": ";
        std::cin >> students[idx].name;
        std::cout << "Enter grade #" << idx + 1 << ": ";
        std::cin >> students[idx].grade;
    }
    
    sortNames(students, countStudents);
    
    for(int i = 0; i < countStudents; i++)
        std::cout << students[i].name << " got a grade of " << students[i].grade << "\n";
        
    delete[] students;
    
    return 0;
}