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How can I Convert negative decimal to binary

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How can I Convert negative decimal to binary

Postby Acunga » Mon Oct 29, 2007 7:07 pm

Can someone give me an algorythm fo this operation?
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Postby Get Real! » Mon Oct 29, 2007 9:22 pm

Consider 8bit numbers...

1 2 3 4 5 6 7 8 (<--bit number)
-----------------------
0 1 1 1 1 0 1 0 (<-- the number 58 )

The LEFT-MOST bit (bit 1) is the MSB and NOT used so by setting bit 1 to...

"0" the number becomes positive and by setting it to "1" the number becomes nagative so to represent -58 we now have...

1 1 1 1 1 0 1 0 (<-- the number -58 )

So what you need is to write TWO ROUTINES...

1. Convert from Dec to Bin
2. Set bits on/off.

Happy with the theory so far? :D
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Postby Hazza » Mon Oct 29, 2007 9:54 pm

Lets try again...

01010100 01101000 01101001 01110011 00100000 01100011 01101111 01110101 01101100 01100100 00100000 01100010 01100101 00100000 01100110 01110101 01101110 00100000 01100001 01101110 01101110 01101111 01111001 01101001 01101110 01100111 00100000 01101111 01110100 01101000 01100101 01110010 01110011 00100000 01110111 01101001 01110100 01101000 00100000 01100010 01101001 01101110 01100001 01110010 01111001 00100000 01101101 01100101 01110011 01110011 01100001 01100111 01100101 01110011 00100001
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Postby Get Real! » Mon Oct 29, 2007 9:58 pm

Hazza wrote:Lets try again...

01010100 01101000 01101001 01110011 00100000 01100011 01101111 01110101 01101100 01100100 00100000 01100010 01100101 00100000 01100110 01110101 01101110 00100000 01100001 01101110 01101110 01101111 01111001 01101001 01101110 01100111 00100000 01101111 01110100 01101000 01100101 01110010 01110011 00100000 01110111 01101001 01110100 01101000 00100000 01100010 01101001 01101110 01100001 01110010 01111001 00100000 01101101 01100101 01110011 01110011 01100001 01100111 01100101 01110011 00100001


:shock: MASTER!!!
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Postby Sotos » Mon Oct 29, 2007 10:03 pm

http://www.wikihow.com/Convert-from-Decimal-to-Binary ;)
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Postby Get Real! » Mon Oct 29, 2007 10:05 pm

Sotos wrote:http://www.wikihow.com/Convert-from-Decimal-to-Binary ;)


He specifically asked for NEGATIVE conversions! :wink:
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Postby Sotos » Mon Oct 29, 2007 10:07 pm

http://www.calvin.edu/academic/rit/webB ... gative.htm :D
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Postby Hazza » Mon Oct 29, 2007 10:11 pm

Get Real! wrote:
:shock: MASTER!!!


Code: Select all
01001110 01101111 01110000 01100101 00101100 00100000 01110101 01110011 01101001 01101110 01100111 00100000 01110100 01101000 01101001 01110011 00100000 01110111 01100101 01100010 01110011 01101001 01110100 01100101 00100000 01110100 01101111 00100000 01100011 01101111 01101110 01110110 01100101 01110010 01110100 00100000 01100110 01101111 01110010 00100000 01101101 01100101 00101110 00001101 00001010 00001101 00001010 01101000 01110100 01110100 01110000 00111010 00101111 00101111 01110111 01110111 01110111 00101110 01101110 01101001 01100011 01101011 01100011 01101001 01110011 01101011 01100101 00101110 01100011 01101111 01101101 00101111 01110100 01101111 01101111 01101100 01110011 00101111 01100010 01101001 01101110 01100001 01110010 01111001 00101110 01110000 01101000 01110000 00001101 00001010 00001101 00001010 01001001 00100000 01101011 01101110 01101111 01110111 00100000 01101010 01100001 01100011 01101011 00100000 01110011 01101000 01101001 01110100 00100000 01100001 01100010 01101111 01110101 01110100 00100000 01100010 01101001 01101110 01100001 01110010 01111001 00100001


:lol: :lol: :lol:

Ok, thats enough from me now :)
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Postby Pyrpolizer » Mon Oct 29, 2007 10:43 pm

Hey GR I think the guy wants you to write him the whole program of dividing by twos... :wink:

Just a question though. How can someone tell if a given binary contains the MSB or not?
I mean without knowing this in advance one would think like that
111010=+58
0111010=+58
1111010=+122 not -58
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Postby Pyrpolizer » Mon Oct 29, 2007 10:53 pm

Shit until I typed my message the program is already there!!
Anyone can answer my question though?
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