Attach several ifstreams files into one?

Hello, I wanted to calc a checksum from several files. In stead of getting the checksum of each file I wanted to attach all files into one big file, and then calc the checksum of that. Can I do this with ifstreams?
Thank you.

You mean morph several files into one?
Yes, that's possible. Read one file at a time and write it to the new file:

Code:

#include <fstream.h>

const char* NewFileName = "NewFile.txt";
const char* OldFileName[] = {"PartOne.txt",
                            "PartTwo.txt",
                            "PartThree.txt"};
const int NrOfFiles = 3;

int main()
{
   //Data
   ofstream WriteFile;
   ifstream ReadFile;
   int Size;
   char* Buffer = NULL;

   //Open the file for writing
   WriteFile.open(NewFileName, ios::out | ios::binary);
   if(WriteFile.fail())
   {
      return 0;
   }

   //Loop though all files
   for(int i=0; i<NrOfFiles; i++)
   {
      //Open the file
      ReadFile.open(OldFileName[i], ios::in | ios::nocreate | ios::binary);
      if(!ReadFile.fail())
      {
         //Get the size of the file
         ReadFile.seekg(0, ios::end);
         Size = ReadFile.tellg();
         ReadFile.seekg(0, ios::beg);

         //Read data into a buffer, then write it to a file
         Buffer = new char[Size];
         if(Buffer != NULL)
         {
            ReadFile.read(Buffer, Size);
            WriteFile.write(Buffer, Size);
            delete[] Buffer;
            Buffer = NULL;
         }

         //Close the file
         ReadFile.close();
      }
   }

   //Close the file and exit
   WriteFile.close();
   return 0;
}

Thank you very much.