输入一串字符，将字符串的小写字母转成大写字母

程序运行：

 

代码：

datas segmentoriginalCaseMaxLength        db 0ffh,0originalCase                 db 100h dup(?)uppercase                    db 100h dup(?)inputPrompt                  db 'input a line of character:$'outputoriginalCasePrompt     db 0dh,0ah,'show noriginal characters:$'outputUppercasePrompt        db 0dh,0ah,'turn uppercase characters:$'
datas endsstacks segmentdb 100h dup(?)stacks endscodes segmentassume cs:codes,ds:datas,ss:stacks
main   proc  far
start:push dsmov ax,0hpush axmov ax,datas           ;初始化dsmov ds,axlea dx,inputPrompt     ;输出输入提示mov ah,9int 21hlea dx,originalCaseMaxLengthmov ah,10 int 21h;输入并且转换小写字母成大写字   mov cl,originalCaseMaxLength+1                         ;记录输入的字符个mov ch,0mov bx,0s:mov al,originalCase[bx]cmp al,'a'                    jae s1                        ;如果al>='a',则跳转s1，判断是否al<='z'jmp s3                        ;否则跳s3，直接保存al于uppercases1: cmp al,'z'jbe s2                      ;如果al<='z',则al转大写字jmp s3                      ;否则跳s3，直接保存al于uppercases2: sub al,20h                  ;转大写字母s3: mov uppercase[bx],al        ;保存al于uppercaseinc bxloop sbreak:mov uppercase[bx+1],'$'            ;设置输出字符mov originalCase[bx+1],'$'lea  dx,outputoriginalCasePrompt      ;输出原始字符提示mov ah,9int 21hlea  dx,originalCase                  ;输出原始字符mov ah,9int 21hlea  dx,outputUppercasePrompt      ;输出转换字符串提示mov ah,9int 21hlea  dx,uppercase                  ;输出转换字符mov ah,9int 21hretmain endp
codes endsend main