// head.h
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int current_num_tables = 0;
const int N = 10000;
int comp(const void *, const void *);
struct table
{
    char code[9];
    char name[255];
    int numb;
};
void add_table(struct table* t, const char* _code, const char* _name, const int _numb)
{
    for (int i = 0; i < current_num_tables; ++i)
    {
        if (!strcmp(_code, t[i].code)) {
            t[i].numb += _numb;
            return;
        }
    }
    strcpy(t[current_num_tables].code, _code);
    strcpy(t[current_num_tables].name, _name);
    t[current_num_tables].numb = _numb;
    current_num_tables++;
    return;
}

void swap_table(struct table* t, const int num1, const int num2)
{
    char buf_code[9];
    char buf_name[255];
    int  buf_numb;

    strcpy(buf_code, t[num2].code);
    strcpy(buf_name, t[num2].name);
    buf_numb = t[num2].numb;

    strcpy(t[num2].code, t[num1].code);
    strcpy(t[num2].name, t[num1].name);
    t[num2].numb = t[num1].numb;

    strcpy(t[num1].code, buf_code);
    strcpy(t[num1].name, buf_name);
    t[num1].numb = buf_numb;
}
void bubbleSort(struct table *t, size_t size) {
    for (size_t i = 1; i < size; i++)
    {
        for (size_t j = 1; j < size; j++)
        {
            if (t[j].numb > t[j - 1].numb) {
                swap_table(t, j, j - 1);
            }
        }
    }
}
void print(struct table q[])
{
    printf("The table looks like this:\n\n");
    printf("Product code\t Name\t Quantity\n\n");
    for (int i = 0; i < N; i++)
    {
        if (q[i].code[0] != '\0')
        {
            printf("%s\t %s\t %d\n", q[i].code, q[i].name, q[i].numb);
        }
    }
}
//qq.cpp
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <Windows.h>
#include "head.h"

int main()
{
    system("color 0A");
    int i;
    struct table *t;
    t = (struct table*)malloc(N * sizeof(struct table));
    for (i = 0; i < N; i++)
    {
        t[i].code[0] = '\0';
        t[i].name[0] = '\0';
        t[i].numb = 0;
    }
    FILE *f = fopen("work.txt", "r");
    int numb;
    char name[255], code[9];
    while (fscanf(f, "%s %s %i", code, name, &numb) != EOF && current_num_tables < N)
    {
        add_table(t, code, name, numb);
    }
    fclose(f);
    bubbleSort(t, current_num_tables);
    print(t);
    f = fopen("table.txt", "w");
    fprintf(f,"Product code\tName\tQuantity\n\n");
    for (i = 0; i < N; i++)
    {
        if (t[i].code[0] != '\0')

        {
            fprintf(f, "%s\t%s\t%i\n", t[i].code, t[i].name, t[i].numb);
        }
    }
    fclose(f);
    free(t);
        printf("\n\nData is written to a file. Press any key.\n\n\n\n");
    _getch();
    return 0;
}