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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LEARN ABOUT NETBSD

wdc

WDC(4)							   BSD Kernel Interfaces Manual 						    WDC(4)

NAME

     wdc -- WD100x compatible hard disk controllers driver

SYNOPSIS

   ISA and ISA plug'n'play controllers
     wdc0 at isa? port 0x1f0 irq 14 flags 0x00
     wdc1 at isa? port 0x170 irq 15 flags 0x00
     wdc* at isapnp?

   Open Firmware ISA
     wdc* at ofisa?

   PCMCIA controllers
     wdc* at pcmcia? function ?

   arm32
     wdc0 at pioc? offset 0x01f0 irq 9

   atari
     wdc0 at mainbus0

   amiga
     wdc0 at mainbus0

DESCRIPTION

     The wdc driver provides the interface with the hardware for the ata(4) driver. This driver supports IDE and EIDE controllers, as well as MFM,
     RLL and ESDI on the ISA bus. PCI IDE controllers in legacy mode are also supported, but the pciide(4) driver may provide more functionality.

     On the ISA front-end, the following flags are supported:
	 0x0001  Enables 32-bit I/O negotiation in the driver. This is known to cause problems with some motherboards.
	 0x0002  Don't probe for the second drive.
	 0x0004  Set WDC_CAPABILITY_ATA_NOSTREAM flag.
	 0x0008  Set WDC_CAPABILITY_ATAPI_NOSTREAM flag.

SEE ALSO

     ata(4), atapi(4), intro(4), isa(4), isapnp(4), mainbus(4), ofisa(4), pciide(4), pcmcia(4), scsi(4), wd(4)

BSD
								  October 8, 2003							       BSD