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    <p>Don't forget, you should use forward slashes in paths, even on windows:</p> <blockquote> <p>[15.16] Why can't I open a file in a different directory such as "..\test.dat"?</p> <p>Because "\t" is a tab character.</p> <p>You should use forward slashes in your filenames, even on operating systems that use backslashes (DOS, Windows, OS/2, etc.). For example:</p> </blockquote> <pre><code>#include &lt;iostream&gt; #include &lt;fstream&gt; int main() { #if 1 std::ifstream file("../test.dat"); // RIGHT! #else std::ifstream file("..\test.dat"); // WRONG! #endif ... } </code></pre> <blockquote> <p>Remember, the backslash ("\") is used in string literals to create special characters: "\n" is a newline, "\b" is a backspace, and "\t" is a tab, "\a" is an "alert", "\v" is a vertical-tab, etc. Therefore the file name "\version\next\alpha\beta\test.dat" is interpreted as a bunch of very funny characters. To be safe, use "/version/next/alpha/beta/test.dat" instead, even on systems that use a "\" as the directory separator. This is because the library routines on these operating systems handle "/" and "\" interchangeably.</p> <p>Of course you could use "\\version\\next\\alpha\\beta\\test.dat", but that might hurt you (there's a non-zero chance you'll forget one of the "\"s, a rather subtle bug since most people don't notice it) and it can't help you (there's no benefit for using "\" over "/"). Besides "/" is more portable since it works on all flavors of Unix, Plan 9, Inferno, all Windows, OS/2, etc., but "\" works only on a subset of that list. So "\" costs you something and gains you nothing: use "/" instead. </p> </blockquote> <p>(From <a href="http://www.parashift.com/c++-faq-lite/input-output.html#faq-15.16" rel="nofollow noreferrer" title="C++ FAQ Lite">C++ FAQ Lite</a>)</p>
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