这是我刚编的一个程序，就是让用户自己输入X,Y的值，然后判断它在第几象限，轴上默认为K=0，输入的时候老师说电脑上存的是它的ASCII码，就不能直接这样比了，要先把ASCII码转为二进制的，可是要怎么转呢，请高手帮忙
DATA SEGMENT
STR1 DB 'Please input X',0DH,0AH,'$'
STR2 DB 'Please input Y',0DH,0AH,'$'
D0   DB 'K is 0',0DH,0AH,'$'
D1   DB 'K is 1',0DH,0AH,'$'
D2   DB 'K is 2',0DH,0AH,'$'
D3   DB 'K is 3',0DH,0AH,'$'
D4   DB 'K is 4',0DH,0AH,'$'
   X DB 20
     DB ?
  DB 20 DUP(?)
   Y DB 20
     DB ?
  DB 20 DUP(?)
DATA ENDS
CODE SEGMENT
     ASSUME CS:CODE,DS:DATA,ES:DATA
START: MOV AX,DATA
       MOV DS,AX
       MOV ES,AX
       LEA DX,STR1
       MOV AH,9
       INT 21H
       LEA DX,X
       MOV AH,0AH
       INT 21H
       MOV BX,DX
       LEA DX,STR2
       MOV AH,9
       INT 21H
       LEA DX,Y
       MOV AH,0AH
       INT 21H
       MOV CX,DX
       CMP BX,0
       JZ  K0
       CMP CX,0
       JZ  K0
       JG  K12
       CMP BX,0
       JG  K4
       LEA DX,D3
       MOV AH,9
       INT 21H
       JMP EXIT
  K0:  LEA DX,D0
       MOV AH,9
       INT 21H
       JMP EXIT
  K4:  LEA DX,D4
       MOV AH,9
       INT 21H
       JMP EXIT
  K12: MOV BX,0
       JG  K1
       LEA DX,D2
       MOV AH,9
       INT 21H
       JMP EXIT
  K1:  LEA DX,D1
       MOV AH,9
       INT 21H
EXIT:  MOV AH,4CH
       INT 21H
CODE ENDS
     END START

没有人能帮忙吗

DATA SEGMENT
STR1 DB 'Please input X',0DH,0AH,'$'
STR2 DB 0DH,0AH,'Please input Y',0dh,0ah,'$'
D0   DB 0DH,0AH,'K is 0','$'
D1   DB 0DH,0AH,'K is 1','$'
D2   DB 0DH,0AH,'K is 2','$'
D3   DB 0DH,0AH,'K is 3','$'
D4   DB 0DH,0AH,'K is 4','$'
   X DB 20
     DB ?
  xm DB 20 DUP(?)
   Y DB 20
     DB ?
  ym DB 20 DUP(?)
DATA ENDS
CODE SEGMENT
     ASSUME CS:CODE,DS:DATA,ES:DATA
START: MOV AX,DATA
       MOV DS,AX
       MOV ES,AX
       LEA DX,STR1
       MOV AH,9
       INT 21H
       LEA DX,X
       MOV AH,0AH
       INT 21H
      

       LEA DX,STR2
       MOV AH,9
       INT 21H
       LEA DX,Y
       MOV AH,0AH
       INT 21H
     

    mov bl,xm
    mov cl,ym
       CMP Bl,'0'
       JZ  K0
       CMP Cl,'0'
       JZ  K0
    cmp bl,'-'
    jz kb
       cmp cl,'-'
    jnz k1
  k4:
       LEA DX,D4
       MOV AH,9
       INT 21H
       JMP EXIT
  K0:  LEA DX,D0
       MOV AH,9
       INT 21H
       JMP EXIt
  kb:
    cmp cl,'-'
    jnz k2
  K3:  LEA DX,D3
       MOV AH,9
       INT 21H
       JMP EXIT
  K2:

       LEA DX,D2
       MOV AH,9
       INT 21H
       JMP EXIT
  K1:  LEA DX,D1
       MOV AH,9
       INT 21H
EXIT:  MOV AH,4CH
       INT 21H
CODE ENDS
     END START 

太感谢了