Re: [Gm2] Are there standard functions such as FLOAT and TRUNC?

[Fischlin Andreas]

Hi Gaius,

Remember, as of pim3 (Wirth, 1985) LONGREAL, LONGCARD, and LONGINT  
were introduced and concomitantly also FLOATD and TRUNCD. Wirth (1984,  
1985) does introduce these new types for the very first time, but  
Wirth (1984; don't have 1985 handy right now) without the standard  
functions. However, in the implementations of Modula-2 you find at  
that time and later FLOATD and TRUNCD.

FLOATD(x)		x a value of an integer type (any) and result being of type  
LONGREAL
TRUNCD(x)		x a value of type LONGREAL (could be iimplemented accepting  
any real type) and result being of type LONGINT. Requirement for  
success being that x must if truncated fall into the range of type  
LONGINT. Again the very specific behavior being implementation  
dependent (see also Wirth et al., 1992).

Regards,
Andreas
        

Cited References:
------------------------
Wirth, N., 1985 (ed. 3 (corr.)). Programming in Modula-2. Springer- 
Verlag: Berlin a.o. 202pp.     Wi037

Wirth, N., 1984. Revisions and amendments to Modula-2. Institut für  
Informatik ETHZ, Swiss Federal Institute of Technology: Zürich,  
Switzerland. 27-28pp.  (ftp://ftp.inf.ethz.ch/pub/publications/tech-reports/ 
)    Wi073

Wirth, N., 1985. Revisions and amendments to Modula-2. J. Pascal, Ada  
& Modula-2, 4(1): 25-28.    Wi243

Wirth, N., Gutknecht, J., Heiz, W., Schär, H., Seiler, H., Vetterli,  
C., & Fischlin, A., 1992. MacMETH. A fast Modula-2 language system for  
the Apple Macintosh. User Manual. 4th, completely revised ed..  
Department of Computer Sciences (ETH): Zürich, Switzerland. 116pp.  (http://www.sysecol.ethz.ch/SimSoftware/RAMSES/MacMETH.html#Wirth92 
)    Wi068



ETH Zurich
Prof. Dr. Andreas Fischlin
Systems Ecology - Institute of Integrative Biology
CHN E 21.1
Universitaetstrasse 16
8092 Zurich
SWITZERLAND

address@hidden
www.sysecol.ethz.ch

+41 44 633-6090 phone
+41 44 633-1136 fax

Make it as simple as possible, but distrust it!
________________________________________________________________________

On 19/Feb/2010, at 17:13 , Gaius Mulley wrote:

> Gaius Mulley <address@hidden> writes:
>
> > Carl Glassberg <address@hidden> writes:
> >
> > > Hello, again.
> > >
> > > Are there standard functions such as FLOAT and TRUNC for conversion
> > > to/from SHORTREAL/REAL/LONGREAL?
> >
> > Hi Carl,
> >
> > yes FLOAT, TRUNC exist as well as, TRUNCS, TRUNCL.  Watch out for the
> > dialect of Modula-2 though since if you use -fpim2 -fpim3 or -fiso
> > TRUNC returns a CARDINAL.  Whereas -fpim4 TRUNC returns an INTEGER.
> > I'll update the documentation
>
> Hi,
>
> ok I've updated the documentation and should also correct the above it
> should read:
>
> TRUNC, FLOAT, STRUNC, SFLOAT, LTRUNC, LFLOAT which matches the naming
> schema in ISO.  I've also modified gm2 and testsuite to allow SFLOAT,
> LFLOAT etc rather than FLOATS, FLOATL
>
> regards,
> Gaius
>
>
> _______________________________________________
> gm2 mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/gm2