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Re: Re: (OT) Where is programming headed?

by Rudif (Hermit)
on Dec 15, 2001 at 14:52 UTC ( #132203=note: print w/ replies, xml ) Need Help??


in reply to Re: (OT) Where is programming headed?
in thread (OT) Where is programming headed?

Dominus

>> integral values less than about 253 will be represented and compared exactly

Since this OT is turning into a C refresher course, factual accuracy should be in order. Your statement is true of C/C++ double, which is also what Perl uses for numeric values. The example  float x, y; declares a couple of single-precision floats, which can represent exactly integral values of up to about 225.

A summary of IEEE-754 format can be found here and an interactive converter here.

Rudif


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Re: (OT) Where is programming headed?
by Dominus (Parson) on Dec 15, 2001 at 21:35 UTC
    Says rudif:
    Your statement is true of C/C++ double, which is also what Perl uses for numeric values. The example float x, y;
    Oops! You are absolutely right. My brain is so stuck on doubles that I often forget about single-precision floats.

    Anyway, my main point, which was that the number 1 is exactly representable, is still correct.

    Thanks for the correction.

    --
    Mark Dominus
    Perl Paraphernalia

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