LB23_1

// LB23_1.cpp: главный файл проекта.

#include "stdafx.h"

using namespace System;
using namespace System::IO;

void Zapis( String ^fname )
{
    BinaryWriter ^fb = gcnew BinaryWriter(File::Open(fname, FileMode::OpenOrCreate));
    fb->Seek(0, SeekOrigin::End);
    try {
        String ^type, ^firm; int speed; double price;
        Console::Write("\nПринтер:");
        do {
            Console::Write("\nВведите тип принтера: ");
            type = Console::ReadLine();
            if( type != "" )
            {
                Console::Write("Введите производителя: ");
                firm = Console::ReadLine();
                Console::Write("Введите скорость работы (стр/мин): ");
                speed = Convert::ToInt32(Console::ReadLine());
                Console::Write("Введите цену: ");
                price = Convert::ToDouble(Console::ReadLine());
                fb->Write(type); fb->Write(firm); fb->Write(speed); fb->Write(price);
            }
        } while( type != "" );
    } finally {fb->Close();}
}
void Prosmotr( String ^fname )
{
    if(!File::Exists(fname))
    {
        Console::WriteLine("Файл не найден!"); return;
    }
    BinaryReader ^fb = gcnew BinaryReader(File::OpenRead(fname));
    try {
        Console::WriteLine("\nПросмотр файла:");
        Console::WriteLine("Тип\tФирма\tСкорость\tЦена");
        while(fb->BaseStream->Position < fb->BaseStream->Length)
        {
            String ^type = fb->ReadString();
            String ^firm = fb->ReadString();
            int speed = fb->ReadInt32();
            double price = fb->ReadDouble();
            Console::WriteLine(type+"\t"+firm+"\t"+speed.ToString()+"\t"+price.ToString());
        }
    } finally {fb->Close();}
}
void hp10(String ^fname)
{
    if(!File::Exists(fname))
    {
        Console::WriteLine("Файл не найден!"); return;
    }
    BinaryReader ^fb = gcnew BinaryReader(File::OpenRead(fname));
    try {
        Console::WriteLine("\nПринтеры HP со скоростью > 10 стр/мин");
        while(fb->BaseStream->Position < fb->BaseStream->Length)
        {
            String ^type = fb->ReadString();
            String ^firm = fb->ReadString();
            int speed = fb->ReadInt32();
            double price = fb->ReadDouble();
            if( firm == "HP" && speed > 10 )
                Console::WriteLine(type+"\t"+firm+"\t"+speed.ToString()+"\t"+price.ToString());
        }
    } finally {fb->Close();}
}

int main(array<System::String ^> ^args)
{
    String ^fname = "Belyaev.dat";
    Console::WriteLine(L"Введите данные:");
    Zapis(fname);
    Prosmotr(fname);
    hp10(fname);
    Console::Read();
    return 0;
}