how to convert double to short ?

[Alan]

how to convert double to short ?
for example, I want to convert

double doubleVal1 = 15000.1;
double doubleVal2 = 12000.0;
short shortVal;

shortVal = doubleVal1 - doubleVal2;

I want the result of shortVal = 3000 and store as short instead of double
value 3000.1
how can I do that?

[Robert Sabocanec]

"Alan" <al************ *@hotmail.com> wrote in message
news:bm******** ***@news.hgc.co m.hk...

how to convert double to short ?
for example, I want to convert

double doubleVal1 = 15000.1;
double doubleVal2 = 12000.0;
short shortVal;

shortVal = doubleVal1 - doubleVal2;

I want the result of shortVal = 3000 and store as short instead of double value 3000.1
how can I do that?

You could try numeric_cast from boost library, it's simple for use,
http://www.boost.org/libs/conversion...m#numeric_cast

Robi

[Dan Pop]

In <20************ *************** ***@flash-gordon.me.uk> Mark Gordon <sp******@fla sh-gordon.me.uk> writes:

On Sat, 18 Oct 2003 12:59:35 +0200
Sidney Cadot <si****@jigsaw. nl> wrote:

Mark Gordon wrote:

>>how to convert double to short ?
>>[snip]

> If you don't care about the direction of rounding you've just done
> it.

For C99 at least the rounding direction of implicit conversions and
casts from floating-point types to integer types is defined as
towards-zero, i.e. truncating (6.3.1.4 clause 1). I don't have a C89
standard handy, but I suspect the same is true there.

I thought than in C90 it was implementation defined.

Nope. C99 is no different from C89 on this particular issue.
Based on what I
have to hand I believe that float.h provides you with FLT_ROUNDS which
gives you information about the rounding used.

It doesn't apply here.

The rounding mode for floating-point addition is characterized by the
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^
value of FLT_ROUNDS : -1 indeterminable, 0 toward zero, 1 to nearest, 2
toward positive infinity, 3 toward negative infinity. All other values
for FLT_ROUNDS characterize implementation-defined rounding behavior.

The text relevant to this discussion is:

3.2.1.3 Floating and integral

When a value of floating type is converted to integral type, the
fractional part is discarded. If the value of the integral part
cannot be represented by the integral type, the behavior is
undefined.

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de

[Alan Balmer]

On Sat, 18 Oct 2003 15:46:54 +0800, "Alan"
<al************ *@hotmail.com> wrote:

how to convert double to short ?
With fear and trepidation. Plus range checking.
for example, I want to convert

double doubleVal1 = 15000.1;
double doubleVal2 = 12000.0;
short shortVal;

shortVal = doubleVal1 - doubleVal2;

I want the result of shortVal = 3000 and store as short instead of double
value 3000.1
how can I do that?

--
Al Balmer
Balmer Consulting
re************* ***********@att .net