????2????(N,K??)1????????: - PowerPoint PPT Presentation

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????2????(N,K??)1????????:

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Title: Author: danaro Last modified by: Kuang Created Date: 4/26/2006 3:51:03 AM Document presentation format – PowerPoint PPT presentation

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Title: ????2????(N,K??)1????????:


1
??
  • ????2????(N,K??)1????????

2
  • ????????1?????, (B). (-3)10 ?2?????(8???)???
  • ??-3???,?????3?1?????-3?????
  • (3)10(00000011)2,?1???(11111100)2,??(-3)10(1111
    1100)2

3
  • ????????1?????, (A). (6)10?2?????(8???)???
  • ?????,??0,??1
  • ?2???????. (6)10(00000110)2
  • ?1????(11111001)2

4
2??
  • ????2????(N,K??)2????????
  • ???????(K???1)1,??N
  • ????N?1???1?

5
  • ????????2?????,(A). (25)10 ???2??????
  • 25???,????????0,??(25)10(00011001)2
  • ?1???(11100110)2,?2???(11100111)2

6
  • ????????2?????,
  • (B). (-33)10 ???2??????
  • ??-33???,?????33?2?????-33?????
  • (33)10(00100001)2,?1???(11011110)2,?2???(110111
    11)2
  • ??(-33)10(11011111)2

7
??????
  • 1101 13
  • 1000 8
  • ----------------------------
  • 10101 21
  • 0100 4
  • 0011 3
  • -----------------------------
  • 00111 7
  • 0011 3
  • 0101 5
  • ----------------------------
  • 1000 8
  • 00000100
  • 00000011
  • ----------------------
  • 000000111

8
??????
  • 0100 4
  • - 0011 3
  • -----------------------------
  • 0001 1
  • 0011 3
  • - 0101 5
  • ----------------------------
  • 11110 ?

9
??????
  • 0101 5
  • 0011 3
  • -----------------------------
  • 0101 15
  • 0101
  • -----------------------------
  • 1111

10
??????
11
8???7??
  • (72)8?8?????
  • 82 - (72)8
  • 64 58
  • 6
  • (72)8?7?????
  • 82 - (72)8 1
  • 64 58 1
  • 5

12
??????
  • ???4??(32Bit)????(Floating Point)?????,???????????
    ?????(Normalized Form),???????????? ?- A x
    2N????A????0.1 lt A lt 1
  • ?A?????????,??????1??1?N?????????????,????????????
    ,??2-8?

13
??????
  • ???(Sign)
  • ????1???,1????,0????
  • ???(Exponent,?????)
  • ??????2???8???(?7?),???????????????????????,??25?2
    -3,?????????????,????????? ???????,?????????,???7?
    ????,27128,??0127???063????-64?-1,64127????0?6
    3
  • ??(Mantissa,????????)
  • ??????????9???32???(?24?),?????????

14
  • ???15.5?????????????
  • ??
  • 1.??15.5???2??,(15.5)10 (1111.1)2
  • 2.???(1111.1)2??? (0.11111)2 x 24
  • 3.???????
  • ???0???????
  • ???(4 64)10(68)10(1000100)2
  • ????5?11111,????0,???
  • 111110000000000000000000
  • 4.????? ? ? ?
  • ? ?
  • ? ? ?
  • 0 1000100 111110000000000000000000
  • ?Byte???,? 01000100 11111000 00000000 00000000
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