You are writing a program. Give the necessary statements to open a file and to confirm that the file has been successfully opened for writing. Important: Why bother to test?

Question

What will be an ideal response?

Answer 1

```
include
#include //unnecessary, fstream gets this
#include //for exit(int)
int main()
{
using std::ifstream;
using std::cout;

ifstream inStream;
inStream.open("myFile.txt");
if (inStream.fail())
{
cout << "Input file failed to open\n";
exit(1);
}
}
```

If you try to open an input file that does not exist (This is easy to do.) the call to open will fail. If the file permissions are set so that we cannot read (for input files) or write (for output files) then the open will also fail. The program should crash if the open command, but two of my compilers generate executables that continue to run, doing unexpected things.