计算机等级考试三级PC技术上机13.doc
2013年计算机等级考试三级PC技术上机（13）请编制程序，其功能是：内存中连续存放的20个八位无符号数是一个自动抄表仪抄录的20个用户某月的用水量(立方米)，为了控制用水量，水费计算公式如下(X表示用水量;Y表示水费，单位为分)：a) Y=X*70 X<=5b) Y=10*70+(X-10)*120 X>10例如：用水量(X)： 04H, 0FH, 18H水费 (Y)：0118H,0514H,094CH试计算出这20个用户应缴纳的水费，结果用字(WORD)表示。部分程序已给出, 其中原始数据由过程LOAD从文件INPUT1.DAT中读入SOURCE开始的内存单元中。运算结果要求从RESULT开始存放,由过程SAVE保存到文件OUTPUT1.DAT中。填空BEGIN和END之间已给出的一段源程序使其完整(空白已用横线标出,每行空白一般只需一条指令, 但采用功能相当的多条指令亦可),或删除BEGIN和END之间原有的代码并自行编程来完成要求的功能。对程序必须进行汇编,并与IO.OBJ链接产生PROG1.EXE执行文件,最终运行程序产生结果(无结果或结果不正确者均不得分)。调试中若发现整个程序中存在错误之处, 请加以修改。试题程序：EXTRN LOAD:FAR,SAVE:FARN EQU 20RATE1 EQU 70RATE2 EQU 120DELTA EQU 10STAC SEGMENT STACKDB 128 DUP(?)STAC ENDSDATA SEGMENTSOURCE DB N DUP(?)RESULT DW 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 ;数据区起始地址LEA SI,NAME0 ;原始数据文件名MOV CX,N ;字节数CALL LOAD ;从'INPUT1.DAT'中读取数据;*BEGIN*LEA SI,SOURCELEA DI,RESULTCLDMOV CX,NMOV BL,RATE1MOV BH,RATE2NEXT: _CMP AL,DELTAJ_ GREATMUL BLJMP STORE待添加的隐藏文字内容2GREAT: _MUL BH_STORE: _INC SILOOP NEXT;*END*LEA DX,RESULT ;结果数据区首址LEA SI,NAME1 ;结果文件名MOV CX,N*2 ;字节数CALL SAVE ;保存结果到文件RETSTART ENDPCODE ENDSEND 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