Concatenate two huge files in C++

Question

I have two std::ofstream text files of a hundred plus megs each and I want to concatenate them. Using fstreams to store the data to create a single file usually ends up with an

Answer 1

On Windows:-

system ("copy File1+File2 OutputFile");

on Linux:-

system ("cat File1 File2 > OutputFile");

But the answer is simple - don't read the whole file into memory! Read the input files in small blocks:-

void Cat (input_file, output_file)
{
  while ((bytes_read = read_data (input_file, buffer, buffer_size)) != 0)
  { 
    write_data (output_file, buffer, bytes_read);
  }
}

int main ()
{
   output_file = open output file

   input_file = open input file1
   Cat (input_file, output_file)
   close input_file

   input_file = open input file2
   Cat (input_file, output_file)
   close input_file
}