macro.asm

ZHUYAO ZSHI LAI JIECHUADE LAIDE

data   segment
       buf db 'Please input a little letter:',0ah,0dh,'$'
data   ends
STACK  SEGMENT
       DB 100 DUP(?)
STACK  ENDS
CODE   SEGMENT
       ASSUME  CS:CODE,SS:STACK
start: mov  ax,data
       mov  ds,ax
print  macro a
       lea  dx,a
       mov  ah,9
       int  21h
       endm
       print buf
       MOV  AH,01H     ;采用DOS调用的01号功能，从键盘输入字符
       INT  21H
       SUB  AL,20H
       MOV  DL,AL
       MOV  AH,02H     ;DOS调用02号功能，显示结果
       INT  21H
       MOV  AH,4ch     ;返回DOS
       INT  21H
CODE   ENDS              ;码段结束
       END  START       ;汇编结束