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Full Discussion: Assigning a shell variable as a float
Top Forums Shell Programming and Scripting Assigning a shell variable as a float Post 28158 by spieterman on Friday 13th of September 2002 04:16:48 PM
Old 09-13-2002
Bug Assigning a shell variable as a float
I'm confused as to how to handle floating point numbers in shell scripts. Is there a way to convert a number (string) read into a shell variable so that it can be used as a floating point decimal for calculation purposes? Or am I stuck with integrating C or Perl into my script?

Ex:

--input

read Number1 --number entered for example is .20
read Number2 --number entered for example is .30

Total

--or--

let Total=$Number1 + $Number2 --which I know only works for integers.

--output

printf "%0.2f" $Total=$Number1 + $Number2

I essentially want a total of two decimal numbers that have been read from the command line (i.e. .20+.30=.50 or Total), but printf will not compute the calculation as I have it coded. I'm at a loss...

Any insight would be appreciated,

--S
Last edited by spieterman; 09-16-2002 at 10:09 AM..
 

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LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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