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Shell Programming and Scripting
How to get the negate of decimal to binary?
Post 302879170 by digiteltlc on Wednesday 11th of December 2013 03:36:34 AM
12-11-2013
hmmmmm????
I never seen the thing under this aspect...
Effectively, let's take 98 :
01100010
do 255-98=157 that is
10011101
comparing the two:
01100010
10011101
Exactly the opposite cosidering bit to bit !!!!!
So I should keep the first part of the script to obtain the first conversion and add a second part to do 255-inputvalue and then again another conversion
like:
i=$1
n=(255-i)
bit0=$(( (i & 0x01) > 0 ))
bit1=$(( (i & 0x02) > 0 ))
bit2=$(( (i & 0x04) > 0 ))
bit3=$(( (i & 0x08) > 0 ))
bit4=$(( (i & 0x10) > 0 ))
bit5=$(( (i & 0x20) > 0 ))
bit6=$(( (i & 0x40) > 0 ))
bit7=$(( (i & 0x80) > 0 ))
bit8=$(( (n & 0x01) > 0 ))
bit9=$(( (n & 0x02) > 0 ))
bitA=$(( (n & 0x04) > 0 ))
bitB=$(( (n & 0x08) > 0 ))
bitC=$(( (n & 0x10) > 0 ))
bitD=$(( (n & 0x20) > 0 ))
bitE=$(( (n & 0x40) > 0 ))
bitF=$(( (n & 0x80) > 0 ))
??????
Is there perhaps a quicker negation of already producted single bit0-bit7 bits ??
I need it for a little project in BeagleBone GPIO, not quite homework...(homework should be done many years ago....when I was younger with less woody brain...
)
Thank you
I never seen the thing under this aspect...
Effectively, let's take 98 :
01100010
do 255-98=157 that is
10011101
comparing the two:
01100010
10011101
Exactly the opposite cosidering bit to bit !!!!!
So I should keep the first part of the script to obtain the first conversion and add a second part to do 255-inputvalue and then again another conversion
like:
i=$1
n=(255-i)
bit0=$(( (i & 0x01) > 0 ))
bit1=$(( (i & 0x02) > 0 ))
bit2=$(( (i & 0x04) > 0 ))
bit3=$(( (i & 0x08) > 0 ))
bit4=$(( (i & 0x10) > 0 ))
bit5=$(( (i & 0x20) > 0 ))
bit6=$(( (i & 0x40) > 0 ))
bit7=$(( (i & 0x80) > 0 ))
bit8=$(( (n & 0x01) > 0 ))
bit9=$(( (n & 0x02) > 0 ))
bitA=$(( (n & 0x04) > 0 ))
bitB=$(( (n & 0x08) > 0 ))
bitC=$(( (n & 0x10) > 0 ))
bitD=$(( (n & 0x20) > 0 ))
bitE=$(( (n & 0x40) > 0 ))
bitF=$(( (n & 0x80) > 0 ))
??????
Is there perhaps a quicker negation of already producted single bit0-bit7 bits ??
I need it for a little project in BeagleBone GPIO, not quite homework...(homework should be done many years ago....when I was younger with less woody brain...
)Thank you
Last edited by digiteltlc; 12-11-2013 at 04:44 AM..
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LEARN ABOUT DEBIAN
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libcaca attribute definitions - Enumerations enum caca_color { CACA_BLACK = 0x00, CACA_BLUE = 0x01, CACA_GREEN = 0x02, CACA_CYAN = 0x03, CACA_RED = 0x04, CACA_MAGENTA = 0x05, CACA_BROWN = 0x06, CACA_LIGHTGRAY = 0x07, CACA_DARKGRAY = 0x08, CACA_LIGHTBLUE = 0x09, CACA_LIGHTGREEN = 0x0a, CACA_LIGHTCYAN = 0x0b, CACA_LIGHTRED = 0x0c, CACA_LIGHTMAGENTA = 0x0d, CACA_YELLOW = 0x0e, CACA_WHITE = 0x0f, CACA_DEFAULT = 0x10, CACA_TRANSPARENT = 0x20 } enum caca_style { CACA_BOLD = 0x01, CACA_ITALICS = 0x02, CACA_UNDERLINE = 0x04, CACA_BLINK = 0x08 } Detailed Description Colours and styles that can be used with caca_set_attr(). Enumeration Type Documentation enum caca_color libcaca colour keyword Enumerator: CACA_BLACK The colour index for black. CACA_BLUE The colour index for blue. CACA_GREEN The colour index for green. CACA_CYAN The colour index for cyan. CACA_RED The colour index for red. CACA_MAGENTA The colour index for magenta. CACA_BROWN The colour index for brown. CACA_LIGHTGRAY The colour index for light gray. CACA_DARKGRAY The colour index for dark gray. CACA_LIGHTBLUE The colour index for blue. CACA_LIGHTGREEN The colour index for light green. CACA_LIGHTCYAN The colour index for light cyan. CACA_LIGHTRED The colour index for light red. CACA_LIGHTMAGENTA The colour index for light magenta. CACA_YELLOW The colour index for yellow. CACA_WHITE The colour index for white. CACA_DEFAULT The output driver's default colour. CACA_TRANSPARENT The transparent colour. enum caca_style libcaca style keyword Enumerator: CACA_BOLD The style mask for bold. CACA_ITALICS The style mask for italics. CACA_UNDERLINE The style mask for underline. CACA_BLINK The style mask for blink. Author Generated automatically by Doxygen for libcaca from the source code. Version 0.99.beta18 Fri Apr 6 2012 libcaca attribute definitions(3caca)