Re: Can Bash do simple math?

[alex xmb sw ratchev]

i mean , the input must be x 60 .. hmm ? i dont see such

On Tue, Aug 6, 2024, 17:11 alex xmb sw ratchev <fxmbsw7@gmail.com> wrote:

> i missed a few question marks .. sorry ..
>
> On Tue, Aug 6, 2024, 17:08 alex xmb sw ratchev <fxmbsw7@gmail.com> wrote:
>
>> ah its like array matching .. uh i had nice awk script , ill make new ..
>>
>> so the % 60 or so code is * 60 ..
>> weird
>>
>> a number , big , prolly smaller than bash max ?
>> then thats already seconds
>>
>> it implents a ' pseudo 60 ' case
>> where in end to * 60
>>
>> i really dont see why 60
>>
>> about my awk , ill do a math converter
>> like 123456 is 123t456
>> i mean convert numbers to multi-stuffix human-readable form
>>
>> On Tue, Aug 6, 2024, 16:47 Greg Wooledge <greg@wooledge.org> wrote:
>>
>>> On Tue, Aug 06, 2024 at 16:35:39 +0200, alex xmb sw ratchev wrote:
>>> > On Tue, Aug 6, 2024, 00:34 <bash@blaklinten.xyz> wrote:
>>> >
>>> > > I have a somewhat strange issue.
>>> > > In a script I use the `((VAR = expression ))` syntax to calculate a
>>> > > simple remainder by division:
>>> > >
>>> > >   ((DIFF = $2 - $1))
>>> > >   ((SECONDS = DIFF % 60))
>>> > >   ((MINUTES = (DIFF % 3600) / 60))
>>> > >   ((HOURS = DIFF / 3600))
>>> > >
>>> >
>>> > just .. what u do diff % 60 , 'SECONDS' it is already .. % 60 ( if it
>>> > counts as how many 60thiet times ) is minutes already
>>> > i suppose u mean $2(seconds) -1(seconds) , = seconds
>>> > if thats not ur case plz explain
>>>
>>> The code is converting a (large) number of seconds into a time interval
>>> expressed as a number of hours, plus a number of minutes, plus a number
>>> of seconds.
>>>
>>> There are a few different ways to perform this calculation.  The most
>>> straightforward IMHO would be:
>>>
>>>  1) Divide the total by 3600 to get the number of hours.
>>>  2) Decrease the total by (3600*hours).
>>>  3) Divide the new total by 60 to get the number of minutes.
>>>  4) Decrease the total by (60*minutes).
>>>  5) The remaining total is the number of seconds.
>>>
>>> The poster is using a slight variant, in which the number of hours and
>>> the number of seconds are calculated directly from the total, and the
>>> number of minutes is calculated directly from the total in two steps,
>>> without modifying the total or introducing an explicit temporary
>>> variable.
>>>
>>>  1) The number of seconds is the total mod 60.
>>>  2) The number of hours is the total divided by 3600.
>>>  3) The number of minutes is computed by first taking the total mod 3600
>>>     (which removes the whole hours), and then dividing that by 60.
>>>
>>> There is an *implicit* temporary variable in step 3, but it's not given
>>> a name or a formal storage allocation.
>>>
>>>