計(jì)算機(jī)等級(jí)考試三級(jí)PC技術(shù)上機(jī)（6）

1、2013年計(jì)算機(jī)等級(jí)考試三級(jí)pc技術(shù)上機(jī)（6）請(qǐng)編制程序，其功能是：將內(nèi)存中存放著20個(gè)數(shù)字09之間的ascii字符(包括數(shù)字0和9的ascii字符)或sp字符(20h)，請(qǐng)將數(shù)字09之間的ascii字符(包括數(shù)字0和9的ascii字符)轉(zhuǎn)換為相應(yīng)的八位二進(jìn)制數(shù)，并將sp字符轉(zhuǎn)換為 $ 字符(24h)。將按上述方法處理后得到的20個(gè)字節(jié)存入內(nèi)存中。例如：內(nèi)存中有 20h(sp),30h(0),31h(1),31h(1),20h(sp),32h(2),39h(9)(共20個(gè)ascii字符)結(jié)果為 24h($),00h,01h,01h,01h,24h($),02h(2),09h(9)(共20個(gè)字節(jié)

2、)部分程序已給出, 其中原始數(shù)據(jù)由過(guò)程load從文件input1.dat中讀入source開始的內(nèi)存單元中。運(yùn)算結(jié)果要求從result開始存放,由過(guò)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(biāo)出,每行空白一般只需一條指令, 但采用功能相當(dāng)?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(lái)完成要求的功能。對(duì)程序必須進(jìn)行匯編,并與io.obj鏈接產(chǎn)生prog1.exe執(zhí)行文件,最終運(yùn)行程序產(chǎn)生結(jié)果(無(wú)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(gè)程序中存在錯(cuò)誤之處, 請(qǐng)加以修改。試題程序：extrn load:

3、far,save:farn equ 20stac segment stackdb 128 dup(?)stac endsdata segmentsource db n dup(?)result db 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,axlea dx,source ;數(shù)據(jù)區(qū)起始地址lea si,name0 ;原始數(shù)據(jù)文

4、件名mov cx,n ;字節(jié)數(shù)call load ;從input1.dat中讀取數(shù)據(jù);*begin*_mov di,0_chan: _sub al,20hjz changesub al,_mov resultdi,al_dec cxjz exitjmp chanchange: mov resultdi,24hinc diinc sijmp _exit : nop;*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 ;字節(jié)數(shù)call save ;保存結(jié)果到文件retstart endpcode endsend startc29c91afe

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