794 – std.math.exp2(0) equals 0 instead of 1

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Issue 794 - std.math.exp2(0) equals 0 instead of 1

Summary: std.math.exp2(0) equals 0 instead of 1

Keywords:
Status:	RESOLVED FIXED
Alias:	None
Product:	D
Classification:	Unclassified
Component:	phobos (show other issues)
Version:	D1 (retired)
Hardware:	x86 Windows
Importance :	P2 major
Assignee:	Walter Bright
URL:
Depends on:
Blocks:

See Also:
Reported:	2007年01月04日 15:15 UTC by Robert
Modified:	2014年02月15日 13:12 UTC (History)
CC List:	0 users

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Description Robert 2007年01月04日 15:15:12 UTC

Comment 1 Lionello Lunesu 2007年01月05日 06:38:05 UTC

Must be something wrong with the C run-time:
import std.c.math, std.stdio;
void main()
{
 writefln( std.c.math.exp2f(0.0f) );
 writefln( std.c.math.exp2(0.0) );
 writefln( std.c.math.exp2l(0.0) );
}
These all print 0; when passing 0.00000000001 they'll correctly print 1.

Comment 2 Walter Bright 2007年02月12日 03:36:58 UTC

Fixed DMD 1.005