Question

汇编语言问题

汇编语言问题从键盘输入一个同学的成绩，然后输出相应的等级，程序输入成绩的DOS功能调用应该用哪个功能号，然后如何比较输入的成绩与60分的高低，写出程序片段即可

Answer 1

        CODE  SEGMENT
              ASSUME    CS:CODE

        MSG1  DB        13,10,'please input the score: $'
        DEG0  DB        13,10,'>=90$'
        DEG1  DB        13,10,'>=80$'
        DEG2  DB        13,10,'>=70$'
        DEG3  DB        13,10,'>=60$'
        DEG4  DB        13,10,'<60$'
        ADDR  DW        DEG4,DEG3,DEG2,DEG1,DEG0,DEG0

      START:  PUSH      CS
              POP       DS
              PUSH      CS
              POP       ES

              LEA       DX,MSG1
              MOV       AH,9
              INT       21H

              MOV       DL,0
         @1:
              MOV       AH,1
              INT       21H
              CMP       AL,13
              JE        @2
              AND       AL,0FH
              SHL       DL,1
              MOV       DH,DL
              SHL       DH,1
              SHL       DH,1
              ADD       DL,DH
              ADD       DL,AL
              JMP       @1
         @2:
              MOV       AL,DL
              SUB       AL,50
              CMP       AL,0
              JNL       @3
              MOV       AL,0
         @3:
              MOV       AH,0
              MOV       BL,10
              DIV       BL
              MOV       AH,0
              ADD       AX,AX
              MOV       BX,AX
              LEA       SI,ADDR
              MOV       DX,[SI+BX]
              MOV       AH,9
              INT       21H
              
              MOV       AH,4CH
              INT       21H
        CODE  ENDS
              END       START

追问

这两天没打开百度知道，不好意思啊