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### Re^5: Infinity and Inf? (MAX_INT)

by LanX (Bishop)
 on Sep 01, 2010 at 15:09 UTC ( #858359=note: print w/replies, xml ) Need Help??

in reply to Re^4: Infinity and Inf? (MAX_INT)

Thanks but thats not my problem, its the break of symmetry between .. and ++ which "bugs" me!

IMHO it doesn't make sense to restrict the rangeoperator to signed integers when floats can still represent bigger integers (which are perfectly transparent when used with arithmetic operators).

Cheers Rolf

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Re^6: Infinity and Inf? (MAX_INT)
by BrowserUk (Pope) on Sep 01, 2010 at 16:42 UTC
IMHO it doesn't make sense to restrict the rangeoperator to signed integers when floats can still represent bigger integers

I can sort of sympathise with that.

But for counterpoint, does it make sense to restrict the iteration of a float iterator to unitary integer increments?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
I don't know if I understand you right, you mean to allow rational stepwidth?

Something like BASIC's FOR 3.3 TO 7.8 STEP 0.5?

IMHO the C-Style for is already meant to handle this.

Cheers Rolf

Nit: C-Style for doesn't handle that very well. STEP 0.5 is ok since it's a sum of powers of 2 (2-1), but let's take STEP 0.1 instead:

```\$ perl -E'for (my \$_=0; \$_<=7; \$_+=0.1) { say }'
...
5.6
5.7
5.8
5.9
5.99999999999999
6.09999999999999
6.19999999999999
6.29999999999999
6.39999999999999
6.49999999999999
6.59999999999999
6.69999999999999
6.79999999999999
6.89999999999999
6.99999999999999

Generate the floats from integers to avoid compounding errors:

```\$ perl -E'for (0..70) { say \$_/10 }'
...
5.6
5.7
5.8
5.9
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7
the C-Style for is already meant to handle this.

Indeed. Which is (probably) why the range operator only handles integers.

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