From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | hackers(at)postgreSQL(dot)org (PostgreSQL-development) |
Subject: | NAN code |
Date: | 1999-01-01 04:23:48 |
Message-ID: | 199901010423.XAA26089@candle.pha.pa.us |
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Lists: | pgsql-hackers |
I have found a way to assign NAN to a variable, thanks to the library
source code. Is this better than the code I just posted? Looks pretty
platform-specific, and we may be better with my earlier code to just use
num, which I have committed to the CURRENT tree.
The strange thing is that isnan(0/0) generates a floating-pointer error
and stops the program, but this does not. Strange.
---------------------------------------------------------------------------
#include <stdio.h>
#include <math.h>
main()
{
double x;
x = 3;
if (isnan((x-x)/(x-x)))
printf("nan\n");
else
printf("not nan\n");
}
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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