I found a Bug.The bug lives in function of pow in std.math.

When wake up the bug that, we select value of minus to second
argument of pow.
And happen the <<object.Error: Integer Divide by Zero>> error.

I think that is a Bug. Is it?

sins666 <d-bugmail@puremagic.com> wrote:

> I found a Bug.The bug lives in function of pow in std.math.
>
> When wake up the bug that, we select value of minus to second
> argument of pow.
> And happen the <<object.Error: Integer Divide by Zero>> error.
>
> I think that is a Bug. Is it?

I would recommend discussing such in digitalmars.D.learn.

Now, I'm not able to recreate this. Am I right to understand
it to be:

std.math.pow( 5, -3 ); ?

If not, would you please post code that triggers the bug?

-- 
Simen

== Quote from Simen kjaeraas (simen.kjaras@gmail.com)'s article
> sins666 <d-bugmail@puremagic.com> wrote:
> > I found a Bug.The bug lives in function of pow in std.math.
> >
> > When wake up the bug that, we select value of minus to second
> > argument of pow.
> > And happen the <<object.Error: Integer Divide by Zero>> error.
> >
> > I think that is a Bug. Is it?
> I would recommend discussing such in digitalmars.D.learn.
> Now, I'm not able to recreate this. Am I right to understand
> it to be:
> std.math.pow( 5, -3 ); ?
> If not, would you please post code that triggers the bug?

import std.math;
import std.stdio;

void main()
{
    writeln(pow(5, 2)); // 25
    writeln(pow(5, 0)); // 1
    writeln(pow(5, -3)); // object.Error: Integer Divide by Zero
}

And dmd version is 2.047.
Was I mistake in my source.or bug?

sins666 <d-bugmail@puremagic.com> wrote:

> import std.math;
> import std.stdio;
>
> void main()
> {
>     writeln(pow(5, 2)); // 25
>     writeln(pow(5, 0)); // 1
>     writeln(pow(5, -3)); // object.Error: Integer Divide by Zero
> }
>
> And dmd version is 2.047.
> Was I mistake in my source.or bug?

The mistake is in your code. std.math.pow has a version that takes
only integers, and returns only integers. That is the version you
are using.

If instead you try:

writeln(pow(5.0, -3.0));

You should see improvement.

-- 
Simen

== Quote from Simen kjaeraas (simen.kjaras@gmail.com)'s article
> sins666 <d-bugmail@puremagic.com> wrote:
> > import std.math;
> > import std.stdio;
> >
> > void main()
> > {
> >     writeln(pow(5, 2)); // 25
> >     writeln(pow(5, 0)); // 1
> >     writeln(pow(5, -3)); // object.Error: Integer Divide by
Zero
> > }
> >
> > And dmd version is 2.047.
> > Was I mistake in my source.or bug?
> The mistake is in your code. std.math.pow has a version that
takes
> only integers, and returns only integers. That is the version you
> are using.
> If instead you try:
> writeln(pow(5.0, -3.0));
> You should see improvement.

Oh, I see.
Thank you for your response and advice.

even so, why is that "object.Error: Integer Divide by Zero"...