分支程序結(jié)構(gòu)設(shè)計(jì)實(shí)驗(yàn)報(bào)告

分支程序結(jié)構(gòu)設(shè)計(jì)一.實(shí)驗(yàn)?zāi)康暮鸵?熟悉運(yùn)算類指令對(duì)標(biāo)志位的狀態(tài)影響以及標(biāo)志位狀態(tài)的表示方法；掌握條件轉(zhuǎn)移，無條件轉(zhuǎn)移指令的使用方法；掌握分支程序設(shè)計(jì)，編寫，調(diào)試和運(yùn)行的方法；二.實(shí)驗(yàn)設(shè)備(環(huán)境)及要求:MASM.EXELINK.EXECMD.EXE三.實(shí)驗(yàn)內(nèi)容及步驟：1.編寫程序，實(shí)現(xiàn)將大寫字符串轉(zhuǎn)換為小寫字符串。設(shè)：字符串的首地址為STRING，字符串長(zhǎng)度在LEN單元內(nèi)。數(shù)據(jù)段定義如下；DATA SEGMENT STRING DB ‘Iamastudent’ LEN equ $-STRINGDATAENDS2.從鍵盤輸入一個(gè)字符，判斷該字符是小寫字母，大寫字母，數(shù)字或其它字符，并給出相應(yīng)提示四.實(shí)驗(yàn)結(jié)果與數(shù)據(jù)處理程序源碼：DATASEGMENTSTRING DB'Iamastudent'LEN equ $-STRINGDATAENDSCODESEGMENTASSUMEDS:DATA,CS:CODE;START:MOVAX, DATAMOVDS, AXMOVBX, LENMOVAL, 0AHMOV[BX], ALMOVAL, '$'INCBXMOV[BX], ALMOVAH, 09HLEADX, STRINGINT21HLEABX, STRINGMOVCX, LENL0:MOVDL, [BX]CMPDL,20HJZDP ADDDL, 20HDP:MOVAH, 02HINT21HINCBXLOOPL0L1:JMPL1MOVAH, 4CHINT21HCODEENDSENDSTART運(yùn)行結(jié)果：程序源碼：mydatasegmentstringdb'pleaseinputadata:',0dh,0AH,'$'shuzidb'isshuzi',0dh,0AH,'$'daxiedb'isdaxie',0dh,0AH,'$'xiaoxiedb'isxiaoxie',0dh,0AH,'$'qitadb'isqita',0dh,0AH,'$'mydataendsmycodesegmentassumecs:mycode,ds:mydatastart:movax,segstring;movds,axmovdx,offsetstring;movah,09hint21h;movah,01hint21h;cmpal,'$'jzexitcmpal,30h;jbqita1cmpal,39h;jbshuzi1;cmpal,41hjbqita1;cmpal,5ah;jbdaxie1;cmpal,61h;jbqita1cmpal,7ah;jbxiaoxie1;shuzi1:movdx,offsetshuzi;movah,09h;int21h;jmpl0;xiaoxie1:movdx,offsetxiaoxie;movah,09h;int21h;jmpl0;daxie1:movdx,offsetdaxie;movah,09h;int21h;jmpl0;qita1:movdx,offsetqita;movah,09h;int2