• Paul D. Anderson <paul.d.removethis.anderson comcast.andthis.net> Jul 11 2011

Paul D. Anderson <paul.d.removethis.anderson comcast.andthis.net> writes:

bearophile Wrote:

 This comes from a small sub-thread in D.learn (but I have asked for it the
first time in bug 3837 time ago):
 http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D.learn&article_id=28030
 
 I suggest to turn floating point literals like the following into syntax
errors (maybe just deprecated, so they get accepted using the -d compiler
switch), because the saving of one digit is not worth the small troubles they
cause now and then:
 
 .5
 3.
 
 And require to write them like this:
 
 0.5
 3.0
 


As I slowly approach release of a D version of the General Decimal Arithmetic
specification:

I agree that this syntax (1. or .1) should not be permitted, but it is called
out in the GDA specification.

I don't have any problem with not including it. It only arises in converting
from a string to a decimal number, i.e. Decimal(".1"), Decimal("1.").

Conversion from real numbers or integers is based on what the compiler accepts,
so Decimal(1_000_000) is accepted even though it isn't allowed in the GDA
specification. There's really no way to force the compiler not to allow it.

This is just a heads up. I'll modify the code to disallow 1. and .1 strings. If
anyone has an objection let me know.

It's a relatively small change for me to make, much simpler than a change to
the compiler.

Paul