Hello Daniel,
Daniel J Farrell schrieb:
Can NSNumber containing long double data-type?
Not that I know of.
The docs say in order to
return a number as a long double, use:
- (long)longValue Returns the receiver's value as a long double
precision floating point value.
long is a discrete integer type, long double is a floating point type.
Which documentation are you referring to here as it seems to me to
be a
bug in the documentation. It should read something like:
- (long)longValue Returns the receiver's value as a signed long value.
In the example below I am using +numberWithLong:, however when
returned
this prints out a NaN.
long double num = 1e300;
NSNumber *d = [NSNumber numberWithLong:num];
printf("\n\n%Le",[d longValue]);
//output nan
How do I use long doubles with GNUstep?
My first suggestion would be a custom subclass of NSNumber. In the
long
run I believe that Apple may extend the Cocoa API to support long
double
in the future. (Especially if people request it there.)
I'm not sure how wise it would be to extend GNUstep's API now and
thereby risk people writing non-portable code. But I certainly
wouldn't
object either. Maybe one could use the versioning-macro-machinery to
hide the extension if requested, but I must admit that that machinery
still scares me.
Cheers,
David