I am experimenting with this.

I can do

extended x = 1.;
printf("%lf\n",(double)x);

It needs the cast to get the correct answer.

I was trying to do sprintf() to put it into a buffer, but sprintf would
not compile.

John

John Fletcher wrote:

> extended x = 1.;
> printf("%lf\n",(double)x);
> 
> It needs the cast to get the correct answer.


My guess is that, since printf is currently coming from a C
library, its floating point support is going to match that
of the C implementation.

A reading of the Digital Mars C library docs suggest
you might try a capital L in the format spec:

printf( "%Lf\n", x );

...but that's just a guess on my part.

-Russell B

Yes, you need the Lf for "long double", which matches D's "extended". -Walter

Why doesn't sprintf work for you? I use it!

"Russell Borogove" <kaleja@estarcion.com> wrote in message news:3C51A3B4.5030602@estarcion.com...
> John Fletcher wrote:
>
> > extended x = 1.;
> > printf("%lf\n",(double)x);
> >
> > It needs the cast to get the correct answer.
>
>
> My guess is that, since printf is currently coming from a C library, its floating point support is going to match that of the C implementation.
>
> A reading of the Digital Mars C library docs suggest
> you might try a capital L in the format spec:
>
> printf( "%Lf\n", x );
>
> ...but that's just a guess on my part.
>
> -Russell B
>
>
>

Walter wrote:

> Yes, you need the Lf for "long double", which matches D's "extended". -Walter

Thank you.

>
>
> Why doesn't sprintf work for you? I use it!

I don't know, I couldn't get it to compile, so I dug in the phobos code and saw an example. I'll look again.

Thanks for the answer, Walter and Russell.

John

Walter wrote:

> Yes, you need the Lf for "long double", which matches D's "extended". -Walter
>
> Why doesn't sprintf work for you? I use it!
>

Walter

I can get sprintf to work as long as I don't have printf as well, when I get a conflict of definitions of printf between object.printf and stdio.printf.

John

Just comment out one of them. I'll fix it at my end. -Walter

"John Fletcher" <J.P.Fletcher@aston.ac.uk> wrote in message news:3C55262C.57E5ABB1@aston.ac.uk...
>
>
> Walter wrote:
>
> > Yes, you need the Lf for "long double", which matches D's "extended". -Walter
> >
> > Why doesn't sprintf work for you? I use it!
> >
>
> Walter
>
> I can get sprintf to work as long as I don't have printf as well, when I get a conflict of definitions of printf between object.printf and stdio.printf.
>
> John
>
>
>