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devel / comp.lang.mumps / Numeric Interpretation of Strings

SubjectAuthor
* Numeric Interpretation of StringsSidney Reilley
`* Re: Numeric Interpretation of Stringsed de moel
 `* Re: Numeric Interpretation of Stringsed de moel
  `* Re: Numeric Interpretation of Strings4dmonster
   `- Re: Numeric Interpretation of StringsSidney Reilley

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Numeric Interpretation of Strings

<slk43q$90k$1@dont-email.me>

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From: sidney.reilley.ii@gmail.com (Sidney Reilley)
Newsgroups: comp.lang.mumps
Subject: Numeric Interpretation of Strings
Date: Sat, 30 Oct 2021 18:49:30 -0000 (UTC)
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 by: Sidney Reilley - Sat, 30 Oct 2021 18:49 UTC

Using Okane mumps!

don't understand how

+"123.45e4"

becomes 1.2345e+06

The scientific notation needs to be quoted! a numeric operator needs
to be present. Okay so far, but I don't grok how we go from 123.45e4
to 1.2345e+06.

Re: Numeric Interpretation of Strings

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Subject: Re: Numeric Interpretation of Strings
From: eddemoel@gmail.com (ed de moel)
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 by: ed de moel - Sun, 31 Oct 2021 01:52 UTC

I would expect +"123.45e4" to return 1234500
The unary + operator should return a canonic number.
(even if it happens to be numerically the same as 1.2345E6...)

Ed

Re: Numeric Interpretation of Strings

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Subject: Re: Numeric Interpretation of Strings
From: eddemoel@gmail.com (ed de moel)
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 by: ed de moel - Sun, 31 Oct 2021 01:54 UTC

Or, actually, it should return 123.45, because (in the standard) lowercase "e" is not recognized as "exponential notation".
But many implementations treat "E" and "e" the same in this context.

Ed

Re: Numeric Interpretation of Strings

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Subject: Re: Numeric Interpretation of Strings
From: 4dmonster@gmail.com (4dmonster)
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 by: 4dmonster - Sun, 31 Oct 2021 18:02 UTC

I suppose this happens because 1.2345e+06 is normalized representation of 123.45e4 and floating numbers are stored in that way. When you force type conversation it understands you have floating number. If you want canonical integer you should do explicit convert to integer.

воскресенье, 31 октября 2021 г. в 04:54:47 UTC+3, ed de moel:
> Or, actually, it should return 123.45, because (in the standard) lowercase "e" is not recognized as "exponential notation".
> But many implementations treat "E" and "e" the same in this context.
>
> Ed

Re: Numeric Interpretation of Strings

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From: sidney.reilley.ii@gmail.com (Sidney Reilley)
Newsgroups: comp.lang.mumps
Subject: Re: Numeric Interpretation of Strings
Date: Sun, 31 Oct 2021 20:21:06 -0000 (UTC)
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 by: Sidney Reilley - Sun, 31 Oct 2021 20:21 UTC

On 2021-10-31, 4dmonster <4dmonster@gmail.com> wrote:
> I suppose this happens because 1.2345e+06 is normalized
> representation of 123.45e4 and floating numbers are stored
> in that way. When you force type conversation it understands
> you have floating number. If you want canonical integer you
> should do explicit convert to integer.
>
> воскресенье, 31 октября 2021 г. в 04:54:47 UTC+3, ed de moel:
>> Or, actually, it should return 123.45, because (in the
>> standard) lowercase "e" is not recognized as "exponential
>> notation".
>> But many implementations treat "E" and "e" the same in this
>>context.

It appears that I need a refresher mini-tut about scientific
notation! Thx for all the input.

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