Usuwanie pliku w C++ kończy się niepowodzeniem

void PrintReceipt2() {
    FILE * f, * ff;
    char ch[ 350 ];
    char total[ 10 ];
    printf( "\n" );
    printf( "\n" );
    printf( "\n" );
    printf( "\t\t\t SKLEP SPOZYWCZY\n" );
    printf( "\t\t\t RACHUNEK NR. xxxxxxx\n" );
    printf( "\n" );
    printf( "\t\t PRZEDMIOTY\n" );
    printf( "\t\t=================================================\n" );
    int counter = 0;
    float total2 = 0;
    f = fopen( "List.txt", "r" );
    while( fgets( ch, 100, f ) ) {
        counter++;
        printf( "\t\t %d. - %s", counter, ch );
    }
   
    ff = fopen( "total.txt", "r" );
    while( fgets( total, 10, ff ) ) {
        total2 += atof( total );
        //printf("\n %.2f",total2);
    }
    printf( "\t\t=================================================\n" );
    printf( "\n" );
    printf( "\t\t\t\t\t\t   RAZEM : %.2f \n", total2 );
    printf( "\n" );
   
    printf( "\n" );
    printf( "\t\t\t ZACHOWAJ PARAGON\n" );
    printf( "\t\t\t    DZIEKUJEMY!! \n" );
    fclose( ff );
    fclose( f );
    char oldname1[] = "total.txt";
    char oldname2[] = "List.txt";
    remove( oldname2 );
    remove( oldname1 );
    MainMenu();
}