From:	"A. Sinan Unur" <sinan DOT unur AT cornell DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: round
Date:	Mon, 19 Jan 1998 17:11:02 -0500
Organization:	Cornell University (http://www.cornell.edu/)
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Rikard Björklind wrote:
> 
> I want to know how to assign a double value to an int. Like this for
> example:
> 
> int hej = (PI*sin(34)/43);
> 
> I want the value rounded. Please help me I'm a beginner =).

hej,

first of all, this is a basic C question and hence off-topic. you should
give news:comp.lang.c and/or news:comp.lang.c.moderated a try in the
future, and while you are at it, download the C faq also. in any case,
now that you are here, note the following:

* in ANSI C, arguments to the trigonometric functions are given in
radians, not degrees (360 degrees = 2*PI radians). the header math.h
defines the constants M_PI (180 dg), M_PI_2 (90 dg) and M_PI_4 (45 dg),
use those.

* the best way to proceed depends on what you understand by rounding. if
d is a double value, (int)(d+0.5) is usually reasonable. you might also
want to look at the documentation for floor and ceil functions to see if
that is the functionality you are looking for.

hth.
-- 
----------------------------------------------------------------------
A. Sinan Unur
Department of Policy Analysis and Management, College of Human Ecology,
Cornell University, Ithaca, NY 14853, USA

mailto:sinan DOT unur AT cornell DOT edu
http://www.people.cornell.edu/pages/asu1/

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