p84.asm

本程序是汇编语言的一些基本功能的组合

DATA SEGMENT
 INFO1 DB 0DH,0AH,'INPUT STRING:$'
 INFO2 DB 0DH,0AH,'OUTPUT STRING:$'
 BUFA DB 81
      DB ? 
      DB 80 DUP(0)
 BUFB DB 81 DUP(0)
DATA ENDS
STACK SEGMENT STACK
      DB 200 DUP(0)
STACK ENDS
CODE SEGMENT
 ASSUME DS:DATA,SS:STACK,CS:CODE
START:
 MOV AX,DATA
 MOV DS,AX 
 LEA DX,INFO1
 MOV AH,9
 INT 21H
 LEA DX,BUFA
 MOV AH,10
 INT 21H
 LEA SI,BUFA+1
 MOV CH,0
 MOV CL,[SI]
 ADD SI,CX
 LEA DI,BUFB
NEXT:
 MOV AL,[SI]
 MOV [DI],AL
 DEC SI
 INC DI
 LOOP NEXT
 MOV BYTE PTR [DI],'$'
 LEA DX,INFO2
 MOV AH,9
 INT 21H
 LEA DX,BUFB
 MOV AH,9
 INT 21H
 MOV AH,4CH
 INT 21H
CODE ENDS
 END START