Syntax error in subtraction in Bash Post: 303040006

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Top Forums Shell Programming and Scripting Syntax error in subtraction in Bash Post 303040006 by wisecracker on Monday 21st of October 2019 01:35:04 PM

10-21-2019

Registered User

I am assuming you are using bash or perhaps a POSIX shell like dash.
Your error is telling you that it is not possible to do such a task as these shells have INTEGER arithmetic only.

If you need floating/fixed point arithmetic then you will have to do workarounds using, bc, dc, python, perl, awk or any other methods that are capable of such mechanisms.

(Just an observation, you have both, ${barr1[$i]} and also ${harr1[j]} are these correct?)

EDIT:
Note the second one should have ${harr1[$j]}

An example longhand using INTEGER arithmetic and FIXED point, OSX 10.14.6, default bash terminal:

Code:

Last login: Mon Oct 21 18:25:40 on ttys000
AMIGA:amiga~> x=.098765
AMIGA:amiga~> y=10.3
AMIGA:amiga~> x=$( printf "%.f" ${x}e+12 )
AMIGA:amiga~> y=$( printf "%.f" ${y}e+12 )
AMIGA:amiga~> printf "%.12f\n" $(( y - x ))e-12
10.201235000000
AMIGA:amiga~> _

Last edited by wisecracker; 10-21-2019 at 02:50 PM.. Reason: See EDIT:

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ddis

DDIS(5) 							File Formats Manual							   DDIS(5)

Name
       DDIS - Digital Data Interchange Syntax / ISO ASN.1 (DDIS/ASN.1) files

Description
       DDIS/ASN.1 files conform to Digital's Digital Data Interchange Syntax.  DDIS conforms to syntaxes that can be defined within the specifica-
       tions of International Standards Organization Abstract Syntax Notation One (ISO ASN.1), but is not itself an  implementation  of  full  ISO
       ASN.1 syntax.

       DDIS/ASN.1 files conform to the DDIS/ASN.1 syntax.  The DDIS/ASN.1 syntax is itself used to define other syntaxes.  The following are among
       the syntaxes that are subsets of DDIS/ASN.1:

	      DDIF   Digital Document Interchange Format

	      DTIF   Digital Table Interchange Format

	      DOTS   Data Object Transport Syntax

       Files that conform to one of the DDIS/ASN.1 family of syntaxes are described as DDIS/ASN.1 files.  More specifically,  however,	the  files
       are typed according to a particular DDIS/ASN.1 syntax.  For example, a file that conforms to the DDIF syntax is a DDIF file, and is identi-
       fied by the command as a ddis/ddif file. The command includes the string ddis/ as a part of its output if a file belongs in the	DDIS  fam-
       ily.

See Also
       ctod(1), dtoc(1), DDIF(5), DOTS(5), DTIF(5), CDA(5)

																	   DDIS(5)