[Issue 7376] New: floating point bug
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Fri Jan 27 00:29:08 PST 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7376
Summary: floating point bug
Product: D
Version: D2
Platform: x86_64
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody at puremagic.com
ReportedBy: iteronvexor at gmail.com
--- Comment #0 from iteronvexor at gmail.com 2012-01-27 00:29:06 PST ---
As discussed in this thread:
http://www.digitalmars.com/pnews/read.php?server=news.digitalmars.com&group=digitalmars.D.learn&artnum=31864
Shorter version of the bug:
import std.stdio;
void calculate1(float a, float b)
{
float s1 = 1.0f - a;
float s2 = a * b;
writeln(s2);
writeln(a * b);
}
void calculate2(float a, float b)
{
float s1 = 1.0 - a;
float s2 = a * b;
writeln(s2);
writeln(a * b);
}
void calculate3(double a, double b)
{
double s1 = 1.0 - a;
double s2 = a * b;
writeln(s2);
writeln(a * b);
}
int main()
{
writeln("calculate1:");
calculate1(0.75f,2.0f);
writeln("calculate2:");
calculate2(0.75f,2.0f);
writeln("calculate3:");
calculate3(0.75f,2.0f);
return 0;
}
-------------------------------------------------
+ The complete output
-------------------------------------------------
calculate1:
1.5
1.5
calculate2:
0
1.5
calculate3:
1.5
1.5
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