7例456.docx
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7例456
例4设2000H开始的区域中,存放着14H个数据,请编写一个程序段,找出其中的最大数,并存到2000H单元。
解:
所求程序段如下:
GATMAX:
MOVBX,2000H
MOVAL,[BX]
MOVCX,14H
PL1:
INCBX
CMPAL,[BX]
JAEPL2
MOVAL,[BX]
PL2:
DECCX
JNZPL1
MOVBX,2000H
MOV[BX],AL
例5求两数差的绝对值
data_segSEGMENT
oper1DW135
oper2DW289
resultDW?
data_segENDS
code_segSEGMENT
ASSUMECS:
code_seg,DS:
data_seg
start:
MOVAX,data_seg
MOVDS,AX
MOVAX,oper1
SUBAX,oper2
JGEstore
NEGAX
store:
MOVresult,AX
MOVAH,4CH
INT21H
code_segENDS
ENDstart
例6求两数差的绝对值
data_segSEGMENT
oper1DW135
oper2DW289
resultDW?
data_segENDS
code_segSEGMENT
ASSUMECS:
code_seg,DS:
data_seg
start:
MOVAX,oper1
CMPAX,oper2
JLbranch2
SUBAX,oper2
JMPstore
branch2:
SUBoper2,AX
MOVAX,oper2
store:
MOVresult,AX
MOVAH,4CH
INT21H
code_segENDS
ENDSTART