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1、1.请任意输入一个字符串，将其中大写字母换成小写字母，并将结果显示在屏幕上。2.请任意输入一个字符串，将其中的英文字母全部删除，并将结果显示在屏幕上。3.现有一组字符串为data,name,time,file,code,path,user,exit,quit,text，请编写程序从键盘输入4个字符的字符串，若存在将其修改为disk,并在显示器上显示。4.现有一组字符串为ram,yes,red,the,get,for,and,key,not,may，请编写程序将他们按ASCII大小排序，并在显示器上显示。5.现有一组
2、字符串为data,name,time,file,code,path,user,exit,quit,text，请编写程序从键盘输入4个字符的字符串，若存在将其删除,并在显示器上显示。6.现有一组字符串为data,name,time,file,code,path,user,exit,quit,text，请编写程序将上述字符串排序（升序）并插入disk使其人仍然有序,并在显示器上显示。答案部分：Answer1：DATASEGMENTBUFDB0FFHDB?DB0FFHDUP(?)STROUTDB0DH,0AH,0FDHD
3、UP(?)DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXLEADX,BUFMOVAH,0AHINT21HLEASI,BUF[2]LEADI,STROUT[2]MOVCL,BUF[1]XORCH,CHAGAIN:CMPBYTEPTR[SI],'A'JBNOTUPCMPBYTEPTR[SI],'Z'JANOTUPMOVAL,[SI]ADDAL,20HMOV[DI],ALJMPNEXTNOTUP:MOVAL,[SI]MOV[DI],ALNE
4、XT:INCSIINCDILOOPAGAINMOVBYTEPTR[DI],'$'LEADX,STROUTMOVAH,09HINT21HMOVAH,4CHINT21HCODEENDSENDSTARTAnswer2：DATASEGMENTBUFDB0FFHDB?DB0FFHDUP(?)STROUTDB0DH,0AH,0FDHDUP(?)DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXLEADX,BUFMOVAH,0AHINT21HLEASI
5、,BUF[2]LEADI,STROUT[2]MOVCL,BUF[1]XORCH,CHAGAIN:CMPBYTEPTR[SI],'A'JBNOTUPCMPBYTEPTR[SI],'Z'JANOTUPINCSIJMPNEXTNOTUP:CMPBYTEPTR[SI],'a'JBNOTALPHACMPBYTEPTR[SI],'z'JANOTALPHAINCSIJMPNEXTNOTALPHA:MOVAL,[SI]MOV[DI],ALINCSIINCDINEXT:LOOPAGAINMOVBYTEPTR[DI],'$'LEADX
6、,STROUTMOVAH,09HINT21HMOVAH,4CHINT21HCODEENDSENDSTARTAnswer3：DATASEGMENTBUFDB05HDB?DB05HDUP(?)STROUTDB0DH,0AH,'data'DB0DH,0AH,'name'DB0DH,0AH,'time'DB0DH,0AH,'file'DB0DH,0AH,'code'DB0DH,0AH,'path'DB0DH,0AH,'user'DB0DH,0AH,'exit'DB0DH,0AH,'quit'DB0DH,0AH,'text'
7、,'$'REPLACEDB'disk'DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATA,ES:DATASTART:MOVAX,DATAMOVDS,AXMOVES,AXLEADX,BUFMOVAH,0AHINT21HLEABX,STROUT[2]LEASI,BUF[2]LEADI,STROUT[2]MOVCX,10AGAIN:CLDPUSHCXMOVCX,4REPZCMPSBPOPCXJNZNEXTLEASI,REPLACEMOVDI,BXMOVDX,4SUBAGAIN:MOVAL,[
8、SI]MOV[DI],ALINCSIINCDIDECDXJNZSUBAGAINJMPEXITNEXT:LEASI,BUF[2]ADDBX,6MOVDI,BXLOOPAGAINEXIT:LEADX,STROUTMOVAH,09HINT21HMOVAH,4CHINT21HCODEENDSENDSTARTAnswer4：DATASEGMENTBUFDB0DH,0A
