《微型计算机原理与接口技术》第三课后答案第四章

1、读书破万卷下笔如有神习题一、选择 CBC AAD三、判断 WVW五、设计1、编程实现求 S= (X2+Y2) /Z的值，将最后结果放入 RESULT单元保存。 参考程序如下：DATA SEGMENT;定义数据段X DB 5;给X、Y、Z赋初值Y DB 7Z DB 2RESULT DB ?;定义RESULT单元，预留空间DATA ENDSCODE SEGMENT；数据段结束;定义代码段ASSSUME CS: CODE, DS:DATASTART: MOV AX , DATA；初始化DSMOV DS, AXMOV AL , X；将数据X送ALMUL X；计算X2MOV BX , AX；将中间结果保

2、存到 BXMOV AL , Y；将数据丫送ALMUL Y；计算Y2ADD AX , BX;X2+Y2 ,结果保存W AXDIV Z;计算(X2+Y2) /ZMOV RESULT , AL；最后结果送RESULT单元MOV AH , 4CH;返回DOSINT 21HCODE ENDS END START；代码段结束;汇编结束2.计算 S= (A+B) /2 - 2 (A AND B )。DATASEGMENTDB12DB51DBDATAENDSCODEASSUMECS:CODEMOVAX ,DATAMOVDS：，AXMOVAL,AADDAL,BSHRAL,1SEGMENTDS:START:DAT

3、AMOVAH ,AMOVBL,BANDAH ,BLMOVBL,AHSHLBL,1SUBAL,BLMOVS, ALMOVAH ,4CHINT21HCODE ENDSENDSTART3.纭勺P86 例 4.34.DATASEGMENTXDW34SDW?DATAENDSCODESEGMENTASSUME CS: CODE,DSSTART:MOVAX , DATAMOVDS, AXMOVAX , XCMPAX, 0JLDOUBCMPAX , 10JLETRIBSALAX , 1SALAX , 1JMPEXITDOUB :SAL,AX , 1JMPEXITTRIB :SALAX , 1ADDAX , X

4、EXIT :MOVS, AXMOVAH , 4CHINT 21HCODEENDSENDSTARTDATA5.统计非数字字符的个数DATA SEGMENTBUFDB 20H DUP (?CNTDB ?DATA ENDSCODESEGMENTASSUMECS: CODE, DSSTART:MOVAX , DATAMOVDS, AXLEASI, BUFMOVDL , 0NEXT1 :MOVAH , 01HINT21HMOVSI, ALINCSICMPAL , 0DHJZEXITCMPAL , 30HJGENEXTINCDLJMPNEXT1NEXT :CMPAL , 39HJBENEXT1INCDLJ

5、MPNEXT1EXIT :MOVCNT, DLMOVAH , 4CHINT21HCODEENDSENDSTARTDATA6、将键盘连续输入的小写字母转换成大写字母 CODE SEGMENTASSUME CS:CODE START: MOVAH,01HINT21HMOVBL,ALMOVDL,'-'MOVAH,02HINT21HMOVAL,BLCMPAL, 'a'JBEXITCMPAL, 'z'JAEXITSUBAL,20HMOVDL,ALMOVAH,02HINT21HMOVDL,0AHMOVAH,02HINT21HMOVDL,0DHMOVAH,02

6、HINT21HJMPSTARTEXIT:MOVAH,4CHINT21HCODEENDSENDSTART7.统计负数的个数 DATA SEGMENTBUF DB 45, 50, -34, 40, 4, 15, 29, -1, -2, -59 CN EQU $-buf A DB ? B DB ? DATA ENDS CODE SEGMENTASSUME CS: CODE, DS: DATA START:MOV AX, DATAMOV DS, AX LEA SI, BUF MOVCX, CNMOVBX, 0LP:MOV AL, SIINCSITEST AL, 80H JZNEXTINCBHJMPEXITNEXT:INCBLEXIT:LOOPLPMOVA, BLMOVB, BHMOV AH , 4CH INT 21H CODE ENDS END START 8、