計算機等級考試三級PC技術(shù)上機（2）

1、2013年計算機等級考試三級pc技術(shù)上機（2）請編制程序，其功能是：內(nèi)存中連續(xù)存放著10個無符號8位格雷碼表示的數(shù)，現(xiàn)將此十個數(shù)轉(zhuǎn)換成十個8位二進制數(shù)，結(jié)果存入內(nèi)存，其轉(zhuǎn)換方法為二進制數(shù)的最高位d7與格雷碼的最高位g7相同，二進制數(shù)的其余七位dk(k=6,0)分別為格雷碼的位gk(k=6,0)與二進制數(shù)的位dk+1(k=6,0)異或的結(jié)果。例如：內(nèi)存中有 00h,03h,2bh,67h,0ch,15h,54h,02h,d8h,c7h結(jié)果為 00h,02h,32h,45h,08h,19h,67h,03h,90h,85h部分程序已給出, 其中原始數(shù)據(jù)由過程load從文件input1.dat中讀入s

2、ource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:farn equ 10stac segment stackdb 1

3、28 dup(?)stac endsdata segmentsource db n dup(?) ;順序存放10個字節(jié)數(shù)result db n dup(0) ;存放結(jié)果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,axlea dx,source ;數(shù)據(jù)區(qū)起始地址lea si,name0 ;原始數(shù)據(jù)文件名mov cx,n ;字節(jié)數(shù)call load

4、 ;從input1.dat中讀取數(shù)據(jù);*begin*lea si,sourcelea di,resultmov cx,10agn0: mov al,si_mov cx,8mov bx,0agn1: mov ah,0shl bl,1_ al,1rcl ah,1cmp ah,_jmp nextset_one:or bl,01h待添加的隱藏文字內(nèi)容3next: mov _,bl_loop agn1_mov di,blinc siinc diloop agn0;*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 ;結(jié)果字節(jié)數(shù)call save

5、;保存結(jié)果到文件retstart endpcode endsend start29c91afe4ced1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afedd1b6c87d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af95ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9d1b6c8795ad9c91afe4ced1b6c8795a1afe4ced1

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