求答案，在线等

[adan3678]

下面的程序从键盘输入一字符，若为数字则显示“It is a numeral.”,否则显示“Mistake,it is not a numeral.”然后返回操作系统。
DAT SEGMENT
ISNUM DB “It is a numeral.$”
NONUM DB “Mistake,it is not a numeral.$”
DAT ENDS
MYCD SEGMENT
ASSUME CS：MYCD，DS：DAT
FFD PROC FAR
START：MOV AX，DAT
MOV DS，AX
MOV AH，1
INT 21H
CMP AL，‘0’

____________
CMP AL，‘9’

_____________

_____________
MOV AH，9
INT 21H
DONE： MOV AH，4CH
INT 21H

GO： _______________
MOV AH，9
INT 21H
JMP DONE
FFD ENDP
MYCD ENDS
END START

[gsy999]

[Quote=引用 1 楼 adan3678 的回复:]
作业呀，帮忙
[/Quote]

;判断从键盘输入的是什么字符
;KEYBOARD INPUT WITH ECHO (01H)
;keycode.asm
;ml /c keycode.asm
;link16 /TINY keycode;

code segment public
assume cs:code,ds:code
	org 100h
start:	jmp begin
msg1	db ' Press any key to test,Ctrl-Z to end.',0dh,0ah,'$'
msg2	db ' Letter ',0dh,0ah,'$'
msg3	db ' Extended Ascii Character ',0dh,0ah,'$'
msg4	db ' Digital ',13,10,'$'

begin:	mov ax,cs
	mov ds,ax
	mov dx,offset msg1	;set up to display message
	mov ah,09h			;display string function request
	int 21h				;call DOS
next:
	mov ah,01h			;read keyboard and echo function request
	int 21h				;call DOS
	mov cx,offset msg2	;set up to display message
	cmp al,0			;check if extended ascii char
	jne disp			;no, tack jump
	mov ah,01h			;read keyboard and echo function request
	int 21h				;call DOS
	mov cx,offset msg3
disp:
	cmp al,1ah			;check for control-z
	je done				;quit if control-z
	
	cmp al,'0'
	jl noNumber;
	cmp al,'9'
	jg noNumber;

	;显示输入的字符:
	mov dl,al			;return char in dl for next function
	mov ah,02h			;display character funct request
	int 21h				;call DOS

	mov dx,offset msg4  ;get proper message
	mov ah,09h			;display string function request
	int 21h				;call DOS
	jmp next
	
noNumber:
	;显示输入的字符:
	mov dl,al			;return char in dl for next function
	mov ah,02h			;display character funct request
	int 21h				;call DOS

	mov dx,cx           ;get proper message
	mov ah,09h			;display string function request
	int 21h				;call DOS

	jmp next			;get next character 
done:
	mov ah,00h			;terminate progream funct request
	int 21h				;call DOS
code ends				;end of code segment
end start				;start is the entry point

别忘了结贴!

[adan3678]

作业呀，帮忙

[aiyaya730]

记得结贴,谢谢!

DATA SEGMENT
ISNUM DB “It is a numeral.$”
NONUM DB “Mistake,it is not a numeral.$”
DAT ENDS
MYCD SEGMENT
  ASSUME CS：MYCD，DS：DAT
FFD PROC FAR
START：MOV AX，DAT
  MOV DS，AX
  MOV AH，1
  INT 21H
  CMP AL，‘0’

  ____________      jb GO
  CMP AL，‘9’ 

  _____________     ja GO

  _____________     mov dx,offset ISNUM 
  MOV AH，9
  INT 21H
DONE： MOV AH，4CH
  INT 21H

  GO： _______________   mov dx,offset NONUM
  MOV AH，9
  INT 21H
  JMP DONE
FFD ENDP  
MYCD ENDS
  END START