Sharp PC-1403

88
T h i s r e sults i n an equat i on o f NOT X = - X - 1 , i. e . ,
N OT X = - (X + 1 )
T hu s, 1 i s inv e rte d t o 0 , a nd O to 1 f o r ea c h b i t, whi c h i s ca ll ed " neg a ti on ( NOT
op era ti on } . " T he n , th e f ollowi ng wi l l re s u lt w h e n 1 a n d N O T 1 are a dd e d t o ge t her :
00000000000 0000 1 (1 )
+} 1111 111 1111 11110 ( NOT 1 ) . . . . . . . . . . . . . . . . . . . o n es c o mple m e n t
1 1111 1 111 1 11 11 1 1 ( - 1 ) t w os com pl ement
Thu s , a ll b i t s b eco me 1. A cco r ding to t h e a b o ve numb e r li st , t he b i ts be co me - 1 in
d e cim a l n otat i on , t h at is , 1 + NO T 1 = - 1 .
Th e r e l at io n s h ip b e tw e en n um eric a l va lu e X a nd i t s n e ga t e d (o r i n v e rted ) va l u e N O T X
i s :
X + N OT X = - 1
The neg a ti o n ( NOT ) o f a binar y numb e r 0 00 0000 0 000000 01 is t ak en as f o ll ows :
NO T 0 0000 000000000 0 1
(Nega t i ve)- > 111111 11 1111 1 1 1 0
D e c i ma l 1 6-b it b i n a ry
n o tat i o n n ota t i o n
327 67 0 1 1 11 11 1 11 11 1 1 1 1
3 00 00000000 0 000 1 1
2 00000 00 0000000 1 0
1 0 000000 000 0 0000 1
0 0000 0 000 000 00000
- 1
11 1 ; 1 11 11 1 11 11 1 1
-2
1 1 111 1 111 11 111 10
- 3 111 11 11 11 11 1 11 01
-32768
1 0000 00 00 0 000000
• D ec i ma l nu m ber s c a n b e expr essed i n t he b i n ary not ati o n of 1 6 bit s as foll o w s:
T he X OR i n st ru ction cannot be u sed in com bi na t i o n w i t h th e AN D o r OR ins tru ct i o n in
a n ex pr ess ion. T o exec u t e e x p r essio n D = ( A X OR B ) A ND C, f or examp l e, d ivi d e the
e x p res s io n i n to two p arts for e x e cut i on : D = A XO R Band D = O ANO C .
C o ncepts a nd Terms of BASIC