521.asm

汇编语言的简单的输入字母的大小写转换的小汇编语言程序

data segment
   array dw 0089h,0a89h,0a089h
data ends
 
code segment
    assume cs:code,ds:data
start:
        mov ax,data
        mov ds,ax

        mov ax,array
        mov bx,array+2
        mov dl,0
        cmp ax,bx
        jne next1
        inc dl
next1:  cmp ax,array+4
        jne next2 
        inc dl
next2:  cmp bx,array+4
        jne output
        inc dl

output: add dl,30h
        mov ah,02h
        int 21h

        mov ah,4ch
        int 21h
code ends
      end start