Read Arrow Keys in C++

Hi guys.
I would like to write a program in C++ ,doing something after pressing arrow keys.at first i decided to test reading arrow keys.i wrote a simple program that after pressing arrow keys prints in console screen which one of arrow keys is pressed.for writing this prog i require to find out Ascii values of this 4 keys.therefore i wrote a program print Ascii value of a keyboard key when i press that key.after running this program i find out this value is 3 byte.in my OS (Ubuntu 10.10) this 3 value is 27 , 91 , and 3rd part for UP key ,DOWN key ,RIGHT key ,LEFT key is consecutively  65,66,67 and 68.i expect this prog runs at Windows OS successfully ,because i expect this values be the same of Ubuntu in Windows OS.in Windows this prog is unusable and after discovering Ascii codes of my arrow keys in Windows (that is 2 byte 0x0H) i wrote another special prog for Windows.
I would like to write a portable program ,which can use in different type of OS?what's the solution?why ascii values are different in operating systems?
At the following you can see this progs ,in Ubuntu and also in Windows.

Sincerely.
Kaveh Shahhosseini 1/May/2011

//========================
//this progs wrote in C programming language.
//Ubuntu...used only 65,66,67,68 values instead of "27,91,65" , "27,91,66" ...
#include <stdio.h>
//--------------------------
int main()
{
    char ch;
    do{
        ch=getchar();
         if(ch==65)
            printf("You pressed UP key\n");
         else if(ch==66)
            printf("You pressed DOWN key\n");
         else if(ch==67)
            printf("You pressed RIGHT key\n");
         else if(ch==68)
            printf("You pressed LEFT key\n");



    }while(ch!='e');
 return 0;
}
//======================
//Windows...
#include <stdio.h>
#include <conio.h>
using namespace::std;
//-----------------------------
int main()
{
      char ch;
  do{

        ch=getch();
        if(ch!='\0')
        {
          ch=getch();
          if(ch=='H')
              printf("UP\n");
                 else    if(ch=='P')
              printf("DOWN\n");
                   else    if(ch=='M')
              printf("RIGHT\n");
                     else   if(ch=='K')
              printf("LEFT\n");
        }
  }while(ch!='e');

    return 0;
}
//====================

Console Copy Program in C++

I would like to write a console copy program in C++ that copies a file into another file like linux or windows copy programs.this programs take name of file and copy into the same folder with the same name concatenate it to a "copy_" word.this is a simple program but i would like to develop it's features.
there are some problems at this way.when you give a executable program name to this simple copy program  , the new "copy_executablefile" can't run.for other files such as files with 'pdf' extension it has no problems and copied file (copy_pdfextensionfile) is exactly like the same original file.but in executable file i have a problem.after some check and compare between original file and copied file byte by byte using "Hex Editor" program i discovered that at the end of copied file one byte with 00H value is extra.after removing this extra byte using Hex Editor ,copied file runs successfully.but i can't find out why this extra byte appends into copy_file.what do you know about this prob?please help me.perhaps copying character by character is the reason.because a character is 4byte.what's the solution?
you can see this simple prog following.

Sincerely
Kaveh Shahhosseini 6/May/2011

//this prog tested in Ubuntu 10.10 with Gcc compiler and works correctly.
//begining of copy program.
//=======================
#include <iostream>
#include <fstream>
#include <string.h>
using namespace::std;
//---------------------------
int main()
{
    char filename1[12],ch,filename2[18];
    cout<<"Enter file name:\n";
    cin>>filename1;
    ifstream in(filename1,ios::in);
    strcpy(filename2,"copy_");
    strcat(filename2,filename1);
    ofstream out(filename2,ios::out);
    while(!in.eof())
    {
        in.get(ch);
        out.put(ch);
    }
    return 0;
//end
}
//====================