Структура (объяснить код программы)

#pragma once
 
struct paint {
    char company[100];
    char function[100];
    char color[100];
    int weight;
    int production_country;
};
 
void Read(FILE* file, paint *paints, int recordCount);
int setRecordCount(FILE *file);
void Show(paint* paints, int recordCount);
paint* Add(FILE *file, paint *paints, int recordCount);
void Save(FILE *file, paint *paints, int recordCount);
paint* Remove(FILE *file, paint *paints, int recordCount, int deleteRecord);
void SortingCompany(paint *paints, int recordCount);
void SortingWeight(paint *paints, int recordCount);
paint* Descending(paint *paints, int recordCount);
 
 
#pragma once
 
#include "targetver.h"
 
#include <stdio.h>
#include <tchar.h>
 
 
 
// TODO: Установите здесь ссылки на дополнительные заголовки, требующиеся для программы
 
#include <iostream>
#include <stdio.h>
#include <math.h>
 
#include "stdafx.h"
#include "paintDatabase.h"
 
using namespace std;
 
int setRecordCount(FILE* file) {
    int recordCount;
    if (file = fopen("paint.txt", "rt"))
    {
        fscanf(file, "%d\n", &recordCount);
    }
    else
    {
        cout << "Error" << endl;
    }
    fclose(file);
    return recordCount;
}
 
void Read(FILE* file, paint* paints, int recordCount) {
    cout << "Count record in file: " << recordCount << endl;
 
    int i = 0;
    if (file = fopen("paint.txt", "rt"))
    {
        fseek(file, 3, 0);
        while (!feof(file))
        {           
            fscanf(file, "%s %s %s %d %d\n", paints[i].company, paints[i].function, paints[i].color, &paints[i].weight, &paints[i].production_country);
            i++;
        }
    }
    fclose(file);
}
 
void Show(paint* paints, int recordCount) {
    for (int i = 0; i < recordCount; i++)
        cout << paints[i].company << " " << paints[i].function << " " << paints[i].color << " " << paints[i].weight << " " << paints[i].production_country << endl;
}
 
paint* Add(FILE *file, paint *paints, int recordCount) {
    paint *temp = new paint[recordCount];
    for (int i = 0; i < recordCount - 1; i++)
        temp[i] = paints[i];
    cout << "Company: ";
    cin >> temp[recordCount - 1].company;
    cout << "function: ";
    cin >> temp[recordCount - 1].function;
    cout << "Color: ";
    cin >> temp[recordCount - 1].color;
    cout << "Weight: ";
    cin >> temp[recordCount - 1].weight;
    cout << "Count production_country: ";
    cin >> temp[recordCount - 1].production_country;
    return temp;
}
 
paint* Remove(FILE *file, paint *paints, int recordCount, int deleteRecord) {
    paint* temp = new paint[recordCount];
    int k = 0;
    int i = 0;
    while (i <= recordCount - 1)
    {
        if (k != deleteRecord)
        {
            temp[i] = paints[k];
            i++;
            k++;
        }
        else
        {
            k++;
        }
    }
    return temp;
}
 
void Save(FILE *file, paint *paints, int recordCount) {
    if (file = fopen("paint.txt", "w+")) {
        fprintf(file, "%d\n", recordCount);
        fseek(file, 3, 0);
        for (int i = 0; i < recordCount; i++)
        {
            fprintf(file, "%s %s %s %d %d\n", paints[i].company, paints[i].function, paints[i].color, paints[i].weight, paints[i].production_country);
        }
        fclose(file);
        cout << "Updating file..."<<endl ;
    }
    else
    {
        cout << "Error. Don't open file for writing";
    }
}
 
void SortingCompany(paint *paints, int recordCount) {
    int i, j;
    paint x;
 
    for (i = 0; i < recordCount; i++) {
        for (j = recordCount - 1; j > i; j--) {
            if (paints[j-1].company[0] > paints[j].company[0]) {
                x = paints[j-1];
                paints[j-1] = paints[j];
                paints[j] = x;
            }
        }
    }
}
 
void SortingWeight(paint *paints, int recordCount) {
    int i, j;
    paint x;
 
    for (i = 0; i < recordCount; i++) {
        for (j = recordCount - 1; j > i; j--) {
            if (paints[j-1].weight > paints[j].weight) {
                x = paints[j-1];
                paints[j-1] = paints[j];
                paints[j] = x;
            }
        }
    }
}
 
//сортировка по убыванию/возрастанию
paint* Descending(paint *paints, int recordCount) {
    paint *temp = new paint[recordCount];
    int curr = 0;
    int prev = recordCount - 1;
    while (curr != recordCount )    {
        temp[curr] = paints[prev];
        curr++;
        prev--;
    }
    return temp;
}
 
 
#include "stdafx.h"
#include "paintDatabase.h"
 
using namespace std;
 
int _tmain(int argc, _TCHAR* argv[])
{   
    FILE file;
    int recordCount;
 
    recordCount = setRecordCount(&file);
    paint* paints = new paint[recordCount];
    Read(&file, paints, recordCount);
 
    int flag = 0;
    int deleteRecord;
    
    
    do
    {
        cout << "Change please function: \n1. Add\n2. Remove\n3. Show\nSorting:\n\t4. Company\n\t5. Weigth\n\t6. Descending\\Ascending\n7. Exit" << endl;
        cin >> flag;
        switch (flag) 
        {
        case 1: 
            {
                recordCount++;
                paints = Add(&file, paints, recordCount);
                Save(&file, paints, recordCount);
                break;
            }
        case 2:
            {
                cout << "Enter number deleted record: ";
                cin >> deleteRecord;
                if (deleteRecord >= 1 && deleteRecord <= recordCount)
                {
                    recordCount--;  
                    deleteRecord -= 1;
                    paints = Remove(&file, paints, recordCount, deleteRecord);
                    Save(&file, paints, recordCount);
                }
                break;
            }
        case 3: 
            {
                Show(paints, recordCount);
                break;
            }
        case 4:
            {
                SortingCompany(paints, recordCount);
                Save(&file, paints, recordCount);
                break;
            }
        case 5:
            {
                SortingWeight(paints, recordCount);
                Save(&file, paints, recordCount);
                break;
            }
        case 6: 
            {
                //по убыванию/возрастанию
                paints = Descending(paints, recordCount);
                Save(&file, paints, recordCount);
                break;
            }
        case 7: 
            {
                break;
            }
        }
    }
    while (flag != 7);
    delete paints;
    return 0;
}