Array of Struct sort

This is a discussion on Array of Struct sort within the C++ Programming forums, part of the General Programming Boards category; I have read many topics regarding sort but i wasn`t able to sort them. I am new in C++. What ...

  1. #1
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    Array of Struct sort

    I have read many topics regarding sort but i wasn`t able to sort them. I am new in C++. What changes i must do to sort the names alphabetically ?

    Code:
    #include "stdafx.h"
    #include <iostream>
    #include <string>
    using namespace std;
    
    class classroom
    {
    public:
        string studentName;
    
        void classroom::createStudent(string);
    };
    
    void classroom::createStudent(string name)
    {
        studentName=name;
    }
    
    int main()
    {
        //number of students
        const int numstudents=10;
        
        //create structure
        classroom student[numstudents];
    
        //initialize variables
        student[0].createStudent("Alexa Trina");
        student[1].createStudent("George Ali");
        student[2].createStudent("Comina Riviera");
        student[3].createStudent("Dimitri Askin");
        student[4].createStudent("Erato Georgin");
        student[5].createStudent("Georgina Mare");
        student[6].createStudent("Konan Varvi");
        student[7].createStudent("Lampros Anesti");
        student[8].createStudent("Marina Parate");
        student[9].createStudent("Nikon Smith");
    
        return 0;//indicate that program end succesfully
    }//end main
    Thanks for you time!

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    Quote Originally Posted by fukki View Post
    What changes i must do to sort the names alphabetically ?
    1. #include <algorithm>
    2. Define the less-than operator for your classroom class (operator<). Have this operator compare the std::string studentName member variable.
    3. Call the stl std::sort function on your array.


    ...and presto your array is sorted.



    From a design standpoint it does not make a lot of sense to have a classroom class that stores a single student... and then create an array of classroom objects (each storing a single student) to represent one "classroom". It would make more sense to have a student class representing a single student and then a classroom class representing a single classroom (of multiple students). The classroom object could have an internal std::vector<student> container that stores all the students for that class and an AddStudent function that creates a new named student object and inserts that onto the classroom object's internal student vector. But, that's just my opinion.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

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