A fixed point basic calculator for DASH. Post: 303025621

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Operating Systems OS X (Apple) A fixed point basic calculator for DASH. Post 303025621 by Corona688 on Wednesday 7th of November 2018 10:35:33 AM

11-07-2018

Registered User

I'm sure DASH can divide and multiply absolutely fine. It has * and /.

Quote:

And I already assume a "fractional" part of 1000000000 and use "%.9f" to add any zeros to the end.

I noticed, but the way you're doing it is perhaps the hardest possible way. If you just keep your number as an integer, you can calculate it as an integer, because it is an integer. Addition and subtraction work completely straight. Multiplication and division will need correction before and afterwards respectively. And you will have to stay away from the integer limit because the result of multiplying 64-bit MAXINT by 64-bit MAXINT is a 128-bit number.

Anyway, you can use a here-document to feed values into read. There's another, older trick though, which works especially well in functions and should work anywhere.

Code:

DP=3
MOD=1000

function readnum {
        OLDIFS="$IFS"
        IFS="."
                set -- $1 # Set $1, $2, etc, splitting on "."
        IFS="$OLDIFS"

        N=$1
        FRAC=$2

        [ "$N" = "0" ] && N=""

        for((X=0; X<DP; X++))
        do
                D="${FRAC:$X:1}"
                [ -z "$D" ] && D="0"
                N="$N$D" # Prepend digits to N
        done
}

readnum "0.5"

echo "Integer $N is fixed point $((N/MOD)).$((N%MOD))"

Last edited by Corona688; 11-07-2018 at 11:58 AM..

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LEARN ABOUT REDHAT

tk_getdash

Tk_GetDash(3)						       Tk Library Procedures						     Tk_GetDash(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_GetDash - convert from string to valid dash structure.

SYNOPSIS

       #include <tk.h>

       int
       Tk_GetDash(interp, string, dashPtr)

ARGUMENTS

       Tcl_Interp *interp (in)	      Interpreter to use for error reporting.

       const char * string (in)       Textual value to be converted.

       Tk_Dash *dashPtr (out)	      Points to place to store the dash pattern value converted from string.
_________________________________________________________________

DESCRIPTION

       These  procedure  parses  the  string and fills in the result in the Tk_Dash structure. The string can be a list of integers or a character
       string containing only ".,-_" or spaces. If all goes well, TCL_OK is returned. If string does not have the proper syntax then TCL_ERROR	is
       returned, an error message is left in the interpreter's result, and nothing is stored at *dashPtr.

       The  first possible syntax is a list of integers. Each element represents the number of pixels of a line segment. Only the odd segments are
       drawn using the "outline" color. The other segments are drawn transparent.

       The second possible syntax is a character list containing only 5 possible characters ".,-_ ".  The space can be used to enlarge	the  space
       between other line elements, and can not occur as the first position in the string. Some examples:
		  -dash .     = -dash {2 4}
		  -dash -     = -dash {6 4}
		  -dash -.    = -dash {6 4 2 4}
		  -dash -..   = -dash {6 4 2 4 2 4}
		  -dash {. }  = -dash {2 8}
		  -dash ,     = -dash {4 4}

       The  main  difference  of this syntax with the previous is that it is shape-conserving. This means that all values in the dash list will be
       multiplied by the line width before display. This assures that "."  will always be displayed as a dot and "-" always as a  dash	regardless
       of the line width.

       On  systems where only a limited set of dash patterns, the dash pattern will be displayed as the most close dash pattern that is available.
       For example, on Windows only the first 4 of the above examples are available. The last 2 examples will  be  displayed  identically  as  the
       first one.

KEYWORDS

       dash, conversion

Tk									8.3							     Tk_GetDash(3)