計算機等級考試三級PC技術(shù)上機11

1、2013年計算機等級考試三級pc技術(shù)上機（11）請編制程序，其功能是：以source開始的內(nèi)存區(qū)域存放著多個字節(jié)的數(shù)據(jù)，其中有壓縮bcd碼和其他數(shù)據(jù)?，F(xiàn)按下列編碼規(guī)則進行編碼：在第每個壓縮bcd碼前面加兩個字節(jié)前綴代碼beh和cch，并在其后加兩個字后綴代碼ddh和edh;如果不是壓縮bcd碼，則該數(shù)據(jù)前后均加兩個代碼0dh和0eh。編碼后的數(shù)據(jù)存放到result指示的內(nèi)存區(qū)域。例如：內(nèi)存中有 12h,d9h,86h,54h結(jié)果為 beh,cch,12h,ddh,edh,0eh,d9h,0dh,0eh,beh,cch,86h,ddh,edh,beh,cch,86h,ddh,edh部分程序已給出

2、, 其中原始數(shù)據(jù)由過程load從文件input1.dat中讀入source開始的內(nèi)存單元中。運算結(jié)果要求從result開始存放,由過程save保存到文件output1.dat中。填空begin和end之間已給出的一段源程序使其完整(空白已用橫線標出,每行空白一般只需一條指令, 但采用功能相當?shù)亩鄺l指令亦可),或刪除begin和end之間原有的代碼并自行編程來完成要求的功能。對程序必須進行匯編,并與io.obj鏈接產(chǎn)生prog1.exe執(zhí)行文件,最終運行程序產(chǎn)生結(jié)果(無結(jié)果或結(jié)果不正確者均不得分)。調(diào)試中若發(fā)現(xiàn)整個程序中存在錯誤之處, 請加以修改。試題程序：extrn load:far,save

3、:farn equ 10stac segment stackdb 128 dup(?)stac endsdata segmentsource db n dup(?)result db 5*n dup(0)name0 db input1.dat,0name1 db output1.dat,0data endscode segmentassume cs:code,ds:data,ss:stacstart proc farpush dsxor ax,axpush axmov ax,datamov ds,axmov es,ax ;置附加段寄存器lea dx,source ;數(shù)據(jù)區(qū)起始地址lea si,

4、name0 ;原始數(shù)據(jù)文件名mov cx,n ;字節(jié)數(shù)call load ;從input1.dat中讀取數(shù)據(jù);*begin*lea si,sourcemov di,offset pdata ;pdata為正數(shù)數(shù)組存放緩沖區(qū)首址mov cx,nclp1: mov al,simov bl,almov ah,al_and al,0f0h_mov cl,4_pop cxcmp _ja clp2cmp ah,9ja clp2mov _inc dimov byte ptrdi,0cchinc dimov byte ptrdi,blinc dimov byte ptrdi,0ddhinc dimov byt

5、e ptrdi,0edhjmp clp3clp2: mov byte ptrdi,0dhinc dimov byte ptrdi,0ehinc dimov byte ptrdi,blinc dimov byte ptrdi,0dhinc dimov byte ptrdi,0ehclp3: inc siinc di_;*end*lea dx,result ;結(jié)果數(shù)據(jù)區(qū)首址lea si,name1 ;結(jié)果文件名mov cx,n+2 ;字節(jié)數(shù)call save ;保存結(jié)果到文件retstart endpcode endsend startc29c91afe4ced1b6c8795ad9c91afe4

6、ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afedd1b6c87d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af95ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9d1b6c8795ad9c91afe4ced1b6c8795a1afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afc91fe4ced1d1b6

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