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1、微机原理汇编语言将小写字母转换为大写实验键盘输入一段字符串，以回车结束输入，程序将其中小写字母转换为大写 DATAS SEGMENT tishi db please enter a string!,$ outs db the new steing is:,$;此处输入数据段代码 DATAS ENDS STACKS SEGMENT ;此处输入堆栈段代码 STACKS ENDS CODES SEGMENT ASSUME CS:CODES,DS:DATAS,SS:STACKS START: MOV AX,DATAS MOV DS,AX mov dx, offset tishi mov ah,09h
2、int 21h mov dl,0dh mov ah,02h int 21h mov dl,0ah mov ah,02h int 21h mov si, 0 input: mov ah,01h int 21h cmp al,0dh jz enter ;此处判断输入字符是否为回车 cmp al,61h jb load cmp al,7ah ja load sub al,20h load:mov si,al inc si jmp input enter: mov cx,si;若输入字符为回车，则输入结束 mov si,0 mov dl,0dh; mov ah,02h; int 21h; mov dl,0ah; mov ah,02h; int 21h;此处回车换行 mov dx,offset outs;显示提示符 mov ah,09h int 21h mov dl,0dh; mov ah,02h int 21h mov dl,0ah mov ah,02h int 21h;回车换行 shuchu:mov dl,si mov ah,02h int 21h inc si loop shuchu ;输出循环 MOV AH,4CH INT 21H CODES ENDS END START
