I have a c++ homework. The homework is asking to convert a c program to c++. Below is the question:

You are requested to convert the following C function into a C++ function and then embed it into a complete program and test it. Note that this function copies a binary file of integers and not a text file. The program must accept the arguments (the file to copy and the file to be copied to) from the command line.

/* ==================== cpyFile =====================

This function copies the contents of a binary file
of integers to a second file.
Pre fp1 is file pointer to open read file
fp2 is file pointer to open write file
Post file copied
Return 1 is successful or zero if error
*/
int cpyFile (FILE *fp1, FILE *fp2)
{
  /* Local Definitions */
  int data;

  /* Statements */
  fseek (fp1, 0, SEEK_END);
  if (!ftell (fp1))
  {
    printf ("
acpyFile Error : file empty

");
    return 0;
  } /* if open error */
  if (fseek (fp1, 0, SEEK_SET))
    return 0;
  if (fseek (fp2, 0, SEEK_SET))
    return 0;

  while (fread (&data, sizeof (int), 1, fp1))
    fwrite (&data, sizeof (int), 1, fp2);
  return 1;
} /* cpyFile */

I did my best and managed to convert it, but unfortunately when I m using it , the file that I get after the copy is empty. Below is my answer:

#include <fstream>
#include <cstdlib>
#include <iostream>
using namespace std;
int main(int argc,char* argv[])
{
  if(argc!=3)
  {cerr<<"invalid number of arguments. must be 3."<<endl;exit(1);}

  fstream fp1(argv[1],ios::in);
  if(!fp1)+{cerr<<argv[1]<<" could not be opened"<<endl;exit(1);}

  fstream fp2(argv[2],ios::out);
  if(!fp2)+{cerr<<"file could not be found."<<endl;exit(1);}


  int data;

  fp1.seekg (0,ios::end);
  if (!fp1.tellg ())
  {
    cout<<"
acpyFile Error : file empty

";
    return 0;
  } /* if open error */
  if (fp1.seekg (0, ios::beg))
    return 0;
  if (fp2.seekg (0, ios::beg))
    return 0;

  while (fp1.read (reinterpret_cast<char*>(&data), sizeof (int)))
  {
    fp2.seekp(0);
    fp2.write (reinterpret_cast<char*>(&data), sizeof (int));
  }
  return 1;
}

我尽了最大努力,但我只读了双亲文件,而我没有想到什么。