Two Complient Adjustment

bonekrusher · #1 08-Feb-2009, 14:23

Hi - I am taking an Assemble class and trying to learn hexadecimal representation of decimals. I was hoping someone can explain how to convert -32d to hex

I know that 32d is 20h, but how do I invert 0020h then add 1?

davekw7x · #2 08-Feb-2009, 15:34

Quote:

Originally Posted by bonekrusher

...but how do I...

Code:

I conceptualize it in binary.


With 16 bit arithmetic:

32 Decimal = 20 Hex = 0000 0000 0010 0000 Binary


Start with the binary representation   0000 0000 0010 0000
Take the ones complement               1111 1111 1101 1111
Add one to the ones complement                          +1
                                       -------------------
The 16-bit binary sum                  1111 1111 1110 0000 

Hex representation of 1111 1111 1110 0000 is FFE0

Regards,

Dave

bonekrusher · #3 08-Feb-2009, 16:55

Thank you very much

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