Mercurial > hg > fxanalyse
changeset 16:9d57d1fcbcd5
Implementation of the C99 round() function
| author | Daniele Nicolodi <daniele.nicolodi@obspm.fr> |
|---|---|
| date | Wed, 18 Jul 2012 18:47:44 +0200 |
| parents | b2103439b401 |
| children | 9cadd12e7722 |
| files | future.c future.h |
| diffstat | 2 files changed, 21 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/future.c Wed Jul 18 18:47:44 2012 +0200 @@ -0,0 +1,20 @@ +/* welcome in the 2012 */ + +/* required by CVI */ +#include <ansi_c.h> + +/* an implementation of the C99 `round` function based on `floor` and `ceil` */ +double round(double x) +{ + if (x >= 0.0) { + double y = floor(x); + if (x - y >= 0.5) + y += 1.0; + return y; + } else { + double y = ceil(x); + if (x - y >= 0.5) + y -= 1.0; + return y; + } +}