.MODEL        SMALL
.DATA
     BUFFER1  DB        81
              DB        0
              DB        81 DUP('$')
        STR1  DB        'please input a string',0AH,0DH,'$'
      HUICHE  DB        0AH,0DH,'$'
      COUNT1  DB        0
.CODE
              ASSUME    CS:@CODE ,DS:@DATA
       MAIN:
              MOV       AX,@DATA
              MOV       DS,AX
              LEA       DX,STR1
              MOV       AH,09H
              INT       21H
              LEA       DX,BUFFER1
              MOV       AH,0AH
              INT       21H
              LEA       DX,HUICHE
              MOV       AH,09H
              INT       21H
              LEA       SI,BUFFER1
              ADD       SI,2H
              
              MOV       CX,[SI]
              DEC       CX
              MOV       AX,[SI]
              MOV       BX ,[SI+1]
              MOV       [SI],BX
              MOV       [SI+1],AX

        
     SHUCHU:
              LEA       DX,BUFFER1
              ADD       DX,2H
            
              MOV       AH,09H
              INT       21H

     THEEND:  MOV       AX,4C00H
              INT       21H
              END       MAIN

交换第一个和第二个字符
为什么我输入2个字符，但是输出的是三个字符啊，而且第三个字符和第二个字符是一样的？

你怎么交换的字符   MOV       Al,[SI]
换成这样试试      MOV       Bl ,[SI+1]
                   MOV       [SI],Bl
                   MOV       [SI+1],Al

替换你的      MOV       CX,[SI]
              DEC       CX
              MOV       AX,[SI]
              MOV       BX ,[SI+1]
              MOV       [SI],BX
              MOV       [SI+1],AX

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