#include <conio.h> void _set_screen_lines(int nlines);
This function sets the text screen width to 80 and its height to the
value given by nlines, which can be one of the following: 25, 28,
35, 40, 43 or 50. On a CGA, only 25-line screen is supported. On an
EGA, you can use 25, 35 and 43. VGA, PGA and MCGA support all of the
possible dimensions.
The number of columns (i.e., screen width) is 80 for all of the above
resolutions, because the standard EGA/VGA has no way of changing it.
After this function returns, calls to gettextinfo() will return
the actual screen dimensions as set by _set_screen_lines().
That is, you can e.g. test whether _set_screen_lines() succeeded
by checking the screen height returned by gettextinfo() against
the desired height.
This function has a side effect of erasing the screen contents, so
application programs which use it should make their own arrangements to
redisplay it.
not ANSI, not POSIX
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