汇编第三章习题答案Word文档格式.docx
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汇编第三章习题答案Word文档格式.docx
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34
1200H
0100H
4C2AH
3412H
⑹
7856H
⑺
65B7H
3.5
EA=(IP)+D=7CD9H
物理地址=16XDS+(BX)=224A0H
IP=0600H
物理地址=16XDS+(BX)+D=275B9H
IP=098AH
3.6
MOVBX,2000H
LDSSI,[BX]
MOVAX,[SI]
10
1D000H
FF
1D001H
00
1D002H
80
1D003H
AX
L
8FF10H
8FF11H
8FF12H
37
⑴0626H+27H=064DH
⑵0626H+6BH=0691H
(3)0626H+0FFC6H=05ECH
8FF13H
38
物理地址
立即数寻址
寄存器寻址
20100H
20050H
寄存器间接寻址
21100H
15010H
(8)
200A0H
(9)
寄存器相对寻址
20000H+0100H+0AH=2010AH
(10)
20150H
(11)
201A0H
(12)
201F0H
19
MOVAX,[BX+12]
MOVZERO,AX
MOVAX,ARRAY[BX]
3.10
1234H
0032H
(注意符号扩展)
3.11
1E00H
3.13
(3)0F79H入栈
(4)0F79H出栈
62A0H+CFAOH3240H0010
62A0H+9D60H
(1)0000H0110
3.17
(1)MOVAX,Z
SUBAX,X
ADDAX,W
MOVZ,AX⑵ADDX,6
ADDR,9
MOVAX,W
SUBAX,R
MOVZ,AX
(3)MOVAX,W
IMULX
ADD
Y,6
MOVBX,Y
IDIVBX
MOVR,DX
(4)MOV
BX,W
SUB
BX,X;
(BX)=W-X
MOV
AX,Y
CX,5
IMUL
CX
;
(DX,AX)=YX5
CXAX
AX,BX
;
BX扩展到EAX(32位)
CWD
被除数扩展到64位
IDIV
滁数Y限制为字(16位)
SAL
AX,1
乙AX
可以认为AX能存储下结果
3.19
程序
CF
SF
ZF
0F
MOVAX,0
0000H
—
DECAX
FFFFH
1
ADDAX,7FFFH
7FFFH
ADDAX,2
8000H
NOTAX
SUBAX,0FFFFH
ADDAX,8000H
SUBAX,1
ANDAX,58D1H
58D1H
SACAX,1
B1A2H
SARAX,1
D8D1H
NEGAX
272FH
RORAX,1
9397H
3.21
NOT
DX
AX,1
ADC
DX,0
3.23
⑴BX=009AH⑵BX=0061H⑶BX=OOFBH(4)BX=001CH⑸BX=OOOOH(6)BX=0001H
3.25
(1)+53X2MOVAL,35H
(2)-49X2MOVAL,CFH
SALAL,1结果为6AH=106D
⑶+53-2MOVAL,35H
SARAL,1
结果为1AH=26D
SALAL,1
结果为9EH=-98D
(4)-49-2MOVAL,CFH
结果为E7H=-24D
3.27
(1)DX=0000000001011100B
⑵DX=0000000000010111B
(3)DX=0000010111001000B
(4)DX=0000000001110010B
⑸DX=0001000000010111B
(6)DX=0000000011001101B
⑺DX=0000000010111001B
(8)DX=0000010111001100B
(9)DX=0000000011011100B
3.29
(1)LEASI,CONAME
LEADI,PRLINE
MOVCX,20
CLD
REPMOVSB
(4)LEADI,PRLINE
ADDDI,5
STOSW
(2)LEASI,CONAME
ADDSI,19
ADDDI,19
STD
⑸LEADI,CONAME
MOVAL,20H
REPNESCASB
(3)LEASI,CONAME
ADDSI,2
LODSW
3.31
(1)CLD
MOVCX,132
LEADI,PRINTLINE
REPSTOSB
JNZNO-FOUND
MOVBH,AL
NO-FOUND:
(2)LEADI,STUDENT_ADDRMOVAL,-'
MOVCX,9
第一个’一’在DI-1中
⑶LEADI,STUDENT_ADDR+8
MOVAL,-'
MOVCX,9
—►STD
最后一个’一’在DI-1中
(4)LEADI,STUDENT_NAME
⑸CLD
MOVCX,30
REPESCASB
JNENO-MATCH
LEADI,STUDENT_NAME
MOVAL,环'
NO-MATCH:
LEASI,STUDENT_NAME
LEASI,STUDENT_ADDR+8
LEADI,PRINT_LINE+131
HLT
3.35
BX
JB
JNB
JBE
JNBE
JL
JNL
JLE
JNLE
1F52H
X
V
88C9H
FF82H
007EH
58BAH
020EH
FFC5H
FF8BH
09A0H
1E97H
8AEAH
FC29H
D367H
32A6H
3.37
TESTAL,00101010B
JZROUTINE-4
JPROUTINE-2
CMPAL,00101010B
JZROUTINE-1
JMPROUTINE-3
MOVAL,STATUS
当全为0时
偶转移,当有2个1时(0的情况前一条已经跳转)
当为3个1时
剩余情况,1个1时。
3.39
⑺(8)
⑴LEASI,CONAME
LEADI,PRLINE
MOVCX,20
⑵LEASI,CONAME+19
LEADI,PRLINE+19
⑶LEASI,CONAME+3
LODSB
MOVAH,AL
⑷LEADI,PRLINE+5
STOSB
MOVAL,AH
(5)LEADI,CONAME
MOVAL,20H
REPNZSCASB
JNZNOFOUND
MOVBH,20H
************************************
3.30P112
LEADI,STRING
MOVCX,18
MOVAL,'
&
'
DECDI
MOV[DI],20H
(1)LEASI,PRINT_LINE
MOVCX,132
REPLODSB
(2)LEADI,STUDENT_ADDR
MOVCX,9
_'
(3)LEADI,STUDENT_ADDR+8
(4)LEASI,STUDENT_NAME
MOVCX,30
AGA:
LODSB
CMPAL,20H
JZNEXT
JMPSHORTNEXT1
NEXT:
LOOPAGA
NEXT1:
JNZEXIT
LEADI,STUDENT_NAME
*'
EXIT:
(5)LEASI,STUDENT_NAME
LEADI,PRINT_LINE
LEASI,STUDENT_ADDR+8
LEADI,PRINT_LINE+131
3.32
LEASI,OLDS
LEADI,NEWS
MOVCX,5
REPZCMPSB
JNZNEW_LESS
3.33
(1)CMPDX,CX
JAEXCEED
(2)CMPBX,AX
JGEXCEED
⑶CMPCX,0
JZZERO
(4)CMPBX,AX
JOOVERFLOW
(5)CMPBX,AX
JLEEQ_SMA
(6)CMPDX,CX
JBEEQ_SMA
3.34
(1)L1
⑵L1
⑶L2
⑷L5
⑸L5
(1)JNBJBEJNLJLE
(2)JNBJBE
(3)JNB
(4)JNB
(5)JNB
(6)JB
JBEJL
(7)JB
(8)JNB
JNLJLE
JLJLE
JNLJNLE
3.36
2P>
=qAX=1
2p<
qAX=2
MOVAL,STATUS
NOTAL
TESTAL,2AH
JZROUTINE」
TESTAL,0AH
JZROUTINE_2
TESTAL,22H
TESTAL,28H
TESTAL,02H
JZROUTINE_3
TESTAL,08H
TESTAL,20H
JMPROUTINE_4
3.38
(1)LOOP
L20
AX=5
BX=10H
DX=0
CX=0
⑵LOOPE
AX=2
BX=4
DX=1
CX=3
(3)LOOPNE
AX=3
BX=7
CX=2
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