Re: [Swarm-Support] Followup: found work-around formissing~/swarmarchiver.scm too

[Bill Northcott]

On 17/08/2006, at 11:10 AM, Marcus G. Daniels wrote:


> Bill Northcott wrote:
>
> > On 16/08/2006, at 4:42 AM, Paul Johnson wrote:
> >
> > > Yesterday I was bug shooting a problem in and older FC4 and found  
> > > that gcc treats 50 differently than 50.0 when used as a (double)  
> > > parameter in a draw from a normal distribution, and the value 50  
> > > was converted to 0.  It does not do that anymore in FC5.
.....

> 2  When a value of integer type is converted to a real floating  
> type, if the value being converted can be represented exactly in  
> the new type, it is unchanged.  If the value being converted is in  
> the range of values that can be represented but cannot be  
> represented exactly, the result is either the nearest higher or  
> nearest lower representable value, chosen in an implementation- 
> defined manner.  If the value being converted is outside the range  
> of values that can be represented, the behavior is undefined.
>
> [50]  The remainder operation performed when a value of integer  
> type is converted to unsigned type need not be performed when a  
> value of real floating type is converted to unsigned type.  Thus,  
> the range of portable real floating values is (-1 Utype_MAX+1).
> --
>
> One way a problem could occur is if a prototype was missing.  That  
> is, if the compiler didn't have a declaration for the method.   Or  
> perhaps it is a bug in the compiler.

I don't think it is the compiler.  Or if it is, it is not down to Apple

This code:

> #include <stdio.h>
>
> double dblfunction(double dbl);
>
> double dblfunction(double dbl) {
>     return dbl;
> }
>
> int main (int argc, const char * argv[]) {
>
>     printf("The result is %6.2f\n", dblfunction(50));
>     return 0;
> }

Produces this result with Xcode 2.4, which would seem to agree with  
the standard quoted by Marcus.


> [Session started at 2006-08-17 18:00:36 +1000.]
> The result is  50.00
>
> Float test has exited with status 0.

Bill