微機原理、匯編與接口技術(shù)第二版朱定華版課后答案-資料下載頁
2025-05-31 18:02本頁面
【正文】 2MOVAX0第1項送AXMOVBX1第2項送BXAGAIN:ADDAXBX第i項和第i1項相加其和i2項在AX中XCHGAXBX第i2項和i1項互換LOOPAGAINMOVAXBX將第24項Fibonacci數(shù)送AXMOVDX0將第24項Fibonacci數(shù)擴展為32位二進(jìn)制數(shù)MOVSI0建立OBUF變量數(shù)據(jù)區(qū)的位移指針MOVBX10000MOVCX4除法4次的計數(shù)器AGAIN1DIVBXADDAL30H將商轉(zhuǎn)換為ASCII碼MOVOBUFSIALINCSIMOVAXBX將除數(shù)送AXMOVBXDX將余數(shù)即下一次的被除數(shù)送BX暫存MOVDX0將除數(shù)擴展為32位再除以10得下一次的除數(shù)MOVBP1033DIVBPDX、AX除以BP結(jié)果在AX中DX一定為0XCHGAXBX將AX中的除數(shù)和BX中的被除數(shù)互換LOOPAGAIN1ADDAL30H將十進(jìn)制數(shù)個位轉(zhuǎn)化為ASCII碼MOVOBUFSIAL存入輸出數(shù)據(jù)區(qū)中INCSIMOVOBUFSI′′MOVDXOFFSETOBUFMOVAH9INT21Hretstartendpcodeendsendstart316stacksegmentstack′stack′dw32dup0stackendsdatasegmentBUFDB2550255DUP0dataendscodesegmentstartprocfarassumess:stackcs:codeds:datapushdssubaxaxpushaxmovaxdatamovdsaxMOVDXOFFSETBUF建入一串字符34MOVAH10INT21HMOVSIOFFSETBUT2SI指向串首MOVBXSIBX指向串尾1ADDBLBUF1串首偏移地址加上鍵入字符個數(shù)ADCBH0MOVBYTEPTRBX′′串尾后送串結(jié)束符DECBXBX指向串尾AGAINMOVALBX字符交換XCHGALSIMOVBXALDECBX調(diào)整指針I(yè)NCSICMPSIBX兩指針比較JCAGAINMOVBUF10AH換行的ASCII碼送串首??1單元MOVDXOFFSETBUF1從換行開始輸出MOVAH9INT21Hretstartendpcodeendsendstart317stacksegmentstack′stack′dw32dup0stackendsdatasegmentBUFDB10010DUP0dataends35codesegmentstartprocfarassumess:stackcs:codeds:datapushdssubaxaxpushaxmovaxdatamovdsaxMOVAH10鍵入算式MOVOXOFFSETBUFINT21HMOVCX4MOVBXOFFSETBUF5MOVAH0清進(jìn)位AAA指令產(chǎn)生的進(jìn)位在AH中AGAIN:MOVALBXADDAH5BX低位的進(jìn)位與一加數(shù)相加ANDAX0F0FH將ASCII碼轉(zhuǎn)變?yōu)锽CD數(shù)ADDALAH相加MOVAH0有進(jìn)位是AH加1AAA故調(diào)整前應(yīng)該將AH中的一加數(shù)清除ADDAL30H和變?yōu)锳SCII碼MOVBXALDECBXLOOPAGAINMOVBYTEPTR5BX′′MOVBYTEPTRBX′′DECBXMOVBYTEPTRBX0AH存入換行的ASCII碼MOVDXBX輸出換行、和結(jié)果MOVAH9INT21H36retstartendpcodeendsendstart318stacksegmentstack′stack′dw32dup0stackendsdatasegmentSTR1DB01H00H09H……06HCOUNTEQUSTR1STR2DBCOUNTDUP0OBF1DBCOUNTDUP00DH0AHOBF2DBCOUNTDUP0′′dataendscodesegmentstartprocfarassumess:stackcs:codeds:datapushdssubaxaxpushaxmovaxdatamovdsaxMOVCXCOUNTMOVSI0指向區(qū)首MOVDICOUNT1指向區(qū)尾AGAINMOVALSTR1SIMOVSTR2DIALADDAL30H將AL中的非壓縮BCD數(shù)轉(zhuǎn)變?yōu)锳SCII碼MOVOBF1SIAL正向送OBF137MOVOBF2DIAL反向送OBF2INCSIDECDILOOPAGAINMOVDXOFFSETOBF1輸出二行字符MOVAH9INT21Hretstartendpcodeendsendstart319stacksegmentstack′stack′dw32dup0stackendsdatasegmentACODB0DH0AH′TheASCIIcodeof′CRDB′TheASCIIcodeofCRis0DH′ISDB20H′is′20H00′H′dataendscodesegmentbeginprocfarassumess:stackcs:codeds:datapushdssubaxaxpushaxmovaxdatamovdsaxAGAIN:MOVAH9MOVDXOFFSETACO38INT21HMOVAH1鍵入欲查字符INT21HCMPAL0DH是回車嗎JEBACK是去BACKMOVAHAL不是回車將鍵入AL中的MOVCL4高4位字符轉(zhuǎn)換為ASCII碼SHRAHCL將高位移至低位ADDAH30HCMPAH3AHJCNAD7小于3AH不加7ADDAH7大于等于3AH加7NAD7:MOVIS4AHANDAL0FH將ASCII碼的低4位字符轉(zhuǎn)換為ASCII碼ADDAL3.
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