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copied!<p>If you're on Windows, you can use <code>kbhit()</code> which is part of the Microsoft run-time library. If you're on Linux, you can implement <code>kbhit</code> thus (<a href="http://cboard.cprogramming.com/c-programming/63166-kbhit-linux.html" rel="noreferrer">source</a>):</p> <pre><code>#include <stdio.h> #include <termios.h> #include <unistd.h> #include <fcntl.h> int kbhit(void) { struct termios oldt, newt; int ch; int oldf; tcgetattr(STDIN_FILENO, &oldt); newt = oldt; newt.c_lflag &= ~(ICANON | ECHO); tcsetattr(STDIN_FILENO, TCSANOW, &newt); oldf = fcntl(STDIN_FILENO, F_GETFL, 0); fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK); ch = getchar(); tcsetattr(STDIN_FILENO, TCSANOW, &oldt); fcntl(STDIN_FILENO, F_SETFL, oldf); if(ch != EOF) { ungetc(ch, stdin); return 1; } return 0; } </code></pre> <p><strong>Update:</strong> The above function works on OS X (at least, on OS X 10.5.8 - Leopard, so I would expect it to work on more recent versions of OS X). This <a href="https://gist.github.com/1864660" rel="noreferrer">gist</a> can be saved as <code>kbhit.c</code> and compiled on both Linux and OS X with</p> <pre><code>gcc -o kbhit kbhit.c </code></pre> <p>When run with</p> <pre><code>./kbhit </code></pre> <p>It prompts you for a keypress, and exits when you hit a key (not limited to Enter or printable keys).</p> <p><strong>@Johnsyweb</strong> - please elaborate what you mean by "detailed canonical answer" and "all the concerns". Also, re "cross-platform": With this implementation of <code>kbhit()</code> you can have the same functionality in a C++ program on Linux/Unix/OS X/Windows - which other platforms might you be referring to?</p> <p><strong>Further update for @Johnsyweb:</strong> C++ applications do not live in a hermetically sealed C++ environment. A big reason for C++'s success is interoperability with C. All mainstream platforms are implemented with C interfaces (even if internal implementation is using C++) so your talk of "legacy" seems out of place. Plus, as we are talking about a single function, why do you need C++ for this ("C with classes")? As I pointed out, you can write in C++ and access this functionality easily, and your application's users are unlikely to care <em>how</em> you implemented it.</p>

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