Escape sequence \f - form feed - what exactly is it?
C++EscapingC++ Problem Overview
\f is said to be the form feed. \t is a tab, \a is a beep, \n is a newline. What exactly is a form feed - \f? The following program
#include <iostream>
int main()
{
std::cout << "hello\fgoodbye" << std::endl;
}
prints hello then a female sign (an upside down holy hand grenade:) and then goodbye all on one line.
C++ Solutions
Solution 1 - C++
It skips to the start of the next page. (Applies mostly to terminals where the output device is a printer rather than a VDU.)
Solution 2 - C++
From wiki page
> 12 (form feed, \f, ^L), to cause a > printer to eject paper to the top of > the next page, or a video terminal to > clear the screen.
or more details here.
It seems that this symbol is rather obsolete now and the way it is processed may be(?) implementation dependent. At least for me your code gives the following output (xcode gcc 4.2, gdb console):
hello
goodbye
Solution 3 - C++
If you were programming for a 1980s-style printer, it would eject the paper and start a new page. You are virtually certain to never need it.
Solution 4 - C++
It comes from the era of Line Printers and green-striped fan-fold paper.
Trust me, you ain't gonna need it...
Solution 5 - C++
Although recently its use is undefined, a common and useful use for the form feed is to separate sections of code vertically, like so:
(from http://ergoemacs.org/emacs/emacs_form_feed_section_paging.html)
Solution 6 - C++
It's go to newline then add spaces to start second line at end of first line
Output
Hello
Goodbye