Thread: sorting an array

hey guys !!

i have to search an array of struct students on the basis of their first names, last names and roll numbers ..
so far i am done with the input of the student first , last names and roll numbers . i have problem in searching the array .. my code is :

Code:

#include <iostream>
#include <string>
using namespace std;
struct Student
{
    string FirstName ;
    string LastName ;
    int RollNo ;
    int semester ;
    
};
void inputFromUser (Student S[] );
void SortArray (Student S[]);
void showStudents (Student S[]);
int main ()
{
    Student *S = new Student [3] ;
    
    inputFromUser(S);
    
    showStudents(S);
    SortArray(S);
    system("pause");
    return 0 ;
}
void inputFromUser  (Student S[])
{
    
    for ( int i = 0 ; i<3 ; i++)
    {
        
        cout << " enter the first name " << endl;
        cin >> S[i].FirstName ;        
        cout << " enter last name " << endl;
        cin >> S[i].LastName ;
        cout << " enter roll number " << endl;
        cin >> S[i].RollNo ;
        
    }
    
    
}
void showStudents (Student S[])
{
    cout << " the names entered are " << endl;
    for ( int i = 0 ; i<3 ; i++ )
    {
        cout << S[i].RollNo << "" << S[i].FirstName << " " << S[i].LastName << endl;
    }
    
}
void SortArray (Student S[] )
{
    
    for (int i = 0 ; i<3 ; i++ )
    {
        
    }
}