Can anyone help me with ifstream?

[i hate vb dot net]

what am i doing wrong? I am kinda new to c++ ,and i don't see what is wrong with this code. I am using Dev C++ 5.6.1.

 void write_file ()
{
string ss = "C:\"; 
string path = ss + "my_file.txt";
ifstream out(path.c_str());
out << "stuff";
out.close();
} 

[TwilightSpectre]

You need to escape the backslash in 'ss', by doing one of the following:

string ss = "C:\\";

string ss = R"(C:\)";

[Catfish666]

In strings, the \ character has a special purpose: it denotes an escape sequence.
http://en.cppreference.com/w/cpp/language/escape

So if you want to use the actual \ character in a file name, you have to double it:

what you want             |   how you write it
--------------------------+------------------------------
C:\WINDOWS                |   "C:\\WINDOWS"
C:\WINDOWS\notepad.exe    |   "C:\\WINDOWS\\notepad.exe"

void write_file()
{
    string ss = "C:\\"; 
    string path = ss + "my_file.txt";
    ifstream out(path.c_str());

    out << "stuff";
    // out.close(); // not needed, explanation below
} 

Closing the out file stream isn't needed to be done manually unless you want to re-open out with a different file name right after.

This is because when the write_file() function ends ("returns") the destructor of out will be called, and it will automatically close the file stream.

[LB]

It should be noted that all modern operating systems support using the forward slash instead of the backslash, even Windows. Backslashes are such a hassle that I recommend avoiding their use entirely.

[i hate vb dot net]

Thanks people. You helped me write this piece that works.

ss = "C:\" //or what ever drive letter you want it to be
void write_file()
{
string ss;
std::string str;
str = ss + "drop.txt";
const char * c = str.c_str();
 ofstream file_wr;
  file_wr.open (c);
  file_wr << "This is text.";
  file_wr.close();
}  

[LB]

As the syntax highlighting shows, you have a problem on line 1!

[Catfish666]

Thanks people. You helped me write this piece that works.

Sarcasm, yes? You should learn to mark it.

So you're ignoring the advice to double the backslash, or to use forward slashes, or to not close the file streams, and then you forget a semicolon.

It's as if you never read anyone's reply at all. It's as if you're not here to learn. [/sarcasm]