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Operating Systems OS X (Apple) A fixed point basic calculator for DASH. Post 303025597 by Corona688 on Tuesday 6th of November 2018 03:08:50 PM
Old 11-06-2018
Quote:
Originally Posted by wisecracker
I wouldn't know where to start for floating point maths in pure 'dash' and I'll stick my neck out and say it cannot be done at all.
I misread your post as dash misbehaving rather than zsh, but anyway - I don't mean the shell has floating point. I mean shell printf could use it as a temporary intermediate to implement %f.
Quote:
I don't use "%f" anywhere, I use "%.f"
potato, potahto. The simplest way to implement %f is the C function calls strtof and sprintf, which would use a floating point intermediate. It'd unprocess the number into a float then immediately process it back into a string using the "%.f" specifier. Less than a line.

Quote:
Done manually...
Code:
Last login: Tue Nov  6 19:05:47 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./calc .000000277 - +.000000092
+0.000000185
AMIGA:amiga~/Desktop/Code/Shell> # Therefore SUM="000000185"
AMIGA:amiga~/Desktop/Code/Shell> FLOAT="000000185"
AMIGA:amiga~/Desktop/Code/Shell> INT=""
AMIGA:amiga~/Desktop/Code/Shell> NUMBER=$(( FLOAT/100 ))
-bash: 000000185: value too great for base (error token is "000000185")
AMIGA:amiga~/Desktop/Code/Shell> dash
AMIGA:\u\w> ./calc .000000277 - +.000000092
+0.000000185
AMIGA:\u\w> # Therefore SUM="000000185"
AMIGA:\u\w> FLOAT="000000185"
AMIGA:\u\w> INT=""
AMIGA:\u\w> NUMBER=$(( FLOAT/100 ))
dash: 6: Illegal number: 000000185
AMIGA:\u\w> exit
AMIGA:amiga~/Desktop/Code/Shell> _

Bazza...
You're taking the path of maximum resistance again. If you leave out the decimal point entirely and assume all numbers are multiplied by 100, addition and subtraction "just work", no zero padding required. Then you use division and modulus to extract the full and fractional parts later.

Last edited by Corona688; 11-06-2018 at 04:15 PM..
 

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gnome-calculator(1)						   User Commands					       gnome-calculator(1)

NAME
gnome-calculator, gcalctool - perform basic, financial, and scientific calculations SYNOPSIS
gnome-calculator [-a accuracy] [-D] [-E] [gnome-std-options] DESCRIPTION
The Calculator application is multifunctional and can handle different types of mathematical approaches. Calculator has the following modes: Basic Mode Provides standard calculator functions. You can store numbers in 10 different memory registers, and easily retrieve and replace the numbers in the memory registers. Basic Mode is the default mode. You can use all of the Basic Mode functions in each of the other modes. Financial Mode Provides several complex financial functions. Scientific Mode Provides many additional mathematical functions, including trigonometric and logical functions. You can also store your own functions and constants, when you use Scientific Mode. EXTENDED DESCRIPTION
On startup, Calculator uses the following configuration resources stored in a GConf database. Resource: /schemes/apps/gcalctool/accuracy Values: Accuracy value Description: The number of digits displayed after the numeric point. This value must be in the range 0 to 9. Resource: /schemes/apps/gcalctool/base Values: Numeric Base Description: The initial numeric base. Valid values are "BIN" (binary), "OCT" (octal), "DEC" (deci- mal), and "HEX" (hexadecimal). Resource: /schemes/apps/gcalctool/display Values: Display mode Description: The initial display mode. Valid values are "ENG" (engineering), "FIX" (fixed-point), and SCI" (scientific). Resource: /schemes/apps/gcalctool/mode Values: Mode Description: The initial calculator mode. Valid values are "BASIC", "FINANCIAL", and "SCIENTIFIC". Resource: /schemes/apps/gcalctool/showzeroes Values: true, false (true) Description: Whether to show trailing zeroes after the numeric point in the display value. Resource: /schemes/apps/gcalctool/showregisters Values: true, false (true) Description: Whether to display the memory register window when Calculator starts. Resource: /schemes/apps/gcalctool/trigtype Values: Trig. type Description: The initial trigonometric type. Valid values are "DEG" (degrees), "GRAD" (grads), and "RAD" (radians). Any constants or functions that the user defines are also stored in the GConf database. OPTIONS
The following options are supported: -a accuracy Specifies the number of digits displayed after the numeric point. This value must be in the range 0 to 9. -D Enable debug mode. -E Enable debug mode in the multiple-precision arithmetic package. gnome-std-options Standard options available for use with most GNOME applications. See gnome-std-options(5) for more information. EXAMPLES
Example 1: Launching Calculator example% gnome-calculator EXIT STATUS
The following exit values are returned: 0 Application exited successfully >0 Application exited with failure FILES
The following files are used by this application: /usr/bin/gnome-calculator Executable for Calculator. ~/.gcalctoolrc User-specific resources for customizing the appearance and color of Calculator. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-calculator | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
Calculator Manual Latest version of the GNOME Desktop User Guide for your platform. gnome-std-options(5) NOTES
Written by Glynn Foster and Rich Burridge, Sun Microsystems Inc., 2003. SunOS 5.10 1 Oct 2003 gnome-calculator(1)
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