Write a function that will copy the contents of file in.dat to the file out.dat. Check for successful file opening of both in.dat and out.dat. The loop that actually does the copy should terminate on end of file.

Question

What will be an ideal response?

Answer 1

Note: in.get() is used because it will do both of two necessary things: First, it will not ignore blanks. Second, it will return a 0 (false) when end of file is reached.
```
//copy files: in.dat to out.dat check for
//successful file opening,
//use EOF to terminate copy loop

#include
#include // for exit()
using namespace std;

int main()
{
ifstream in;
ofstream out;
in.open("in.dat");
if ( in.bad())
{
cout << "cannot open in.dat, aborting" << endl;
exit(1);
}
out.open("out.dat");
if (out.bad())
{
cout << "cannot open in.dat, aborting" << endl;
exit(1);
}
char ch;
while ( in.get(ch))
out << ch;
return 0;
}
```