qsort W32CRT

// Winn32CRTconsole.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <locale.h>
#include <stdlib.h>
#include <search.h>

struct List
{
    _TCHAR f_name[15];
    _TCHAR s_name[15];
    _TCHAR l_name[15];
    _TCHAR group[4];
    int f_num;
};

int compare_fnum(const void* vptr1, const void* vptr2)
{
    if (((struct List*)vptr1)->f_num > ((struct List*)vptr2)->f_num)
        return 1;

    if (((struct List*)vptr1)->f_num < ((struct List*)vptr2)->f_num)
        return -1;

    return 0;
}

int compare_group_then_sname(const void* vptr1, const void* vptr2)
{
    if (_tcscmp(((struct List*)vptr1)->group, ((struct List*)vptr2)->group) == 0)
        return _tcscmp(((struct List*)vptr2)->s_name, ((struct List*)vptr1)->s_name);

    return _tcscmp(((struct List*)vptr1)->group, ((struct List*)vptr2)->group);
}

int _tmain(int argc, _TCHAR* argv[])
{
    setlocale(LC_CTYPE, "en.UTF-8");
    struct List Arr[100];

    FILE* fp;

        if (_tfopen_s(&fp,argv[1], _T("r"))!= 0)
            printf("File opening failed!\n");

        int j = 0;

        while (feof(fp)==0)
        {
            _ftscanf(fp, _T("%s"), Arr[j].f_name);
            _ftscanf(fp, _T("%s"), Arr[j].s_name);
            _ftscanf(fp, _T("%s"), Arr[j].l_name);
            _ftscanf(fp, _T("%s"), Arr[j].group);
            fscanf(fp, "%d", &Arr[j].f_num);
            j++;
        }

        if (_ttoi(argv[2]) == 1)
            qsort(&Arr, j, sizeof(struct List), compare_fnum);

        if (_ttoi(argv[2]) == 2)
            qsort(&Arr, j, sizeof(struct List), compare_group_then_sname);

        for (int i = 0; i < j; i++)
        {
            _tprintf(_T("%s "), Arr[i].f_name);
            _tprintf(_T("%s "), Arr[i].s_name);
            _tprintf(_T("%s "), Arr[i].l_name);
            _tprintf(_T("%s "), Arr[i].group);
            printf("%d\n", Arr[i].f_num);
        }
    return 0;
}