基于汇编语言，下面程序修改为十六进制相加结果十进制输出，尽量少修改

Question

DATA SEGMENT ;数据段.
MSG1 DB 13, 10, 'Please Input N (0~9, A~F): $'
MSG2 DB 13, 10, 'I can not count so much ! $'
MSG3 DB 13, 10, 'SUM = $'
DATA ENDS;----------------------------------------------
CODE SEGMENT ;代码段.
ASSUME CS: CODE, DS: DATA
START:
MOV AX, DATA
MOV DS, AX
_IN_X: MOV DX, OFFSET MSG1 ;Please Inpu
t MOV AH, 9
INT 21H
MOV AH, 1 ;输入字符.
INT 21H
CMP AL, '0'
JB _IN_ERR ;小于'0'，输入错误.
CMP AL, '9' JA _IN_X_AF ;大于'9'
SUB AL, '0'
MOV BL, AL
JMP _IN_Y
_IN_X_AF: ;大于'9'
CMP AL, 'A'
JB _IN_ERR ;小于'A'，输入错误.
CMP AL, 'F'
JA _IN_ERR ;大于'F'，输入错误.
SUB AL, 37H
MOV BL, AL
_IN_Y:
MOV DX, OFFSET MSG1 ;Please Input
MOV AH, 9
INT 21H
MOV AH, 1 ;输入字符.
INT 21H
CMP AL, '0'
JB _IN_ERR ;小于'0'，输入错误.
CMP AL, '9'
JA _IN_Y_AF ;大于'9'
SUB AL, '0'
JMP _SUM
_IN_Y_AF: ;大于'9'
CMP AL, 'A'
JB _IN_ERR ;小于'A'，输入错误.
CMP AL, 'F'
JA _IN_ERR ;大于'F'，输入错误.
SUB AL, 37H
_SUM:
ADD AL, BL ;相加
PUSH AX MOV DX, OFFSET MSG3 ;SUM =
MOV AH, 9
INT 21H
POP AX
DISP:;以16进制形式显示
MOV AH, 0
MOV BL, 16
DIV BL
PUSH AX
CMP AL, 10
JB A30
ADD AL, 7
A30:
ADD AL, 30H
MOV DL, AL
MOV AH, 2
INT 21H
POP AX
CMP AH, 10
JB A302
ADD AH, 7
A302:
ADD AH, 30H
MOV DL, AH
MOV AH, 2
INT 21H
MOV DL, 'H'
MOV AH, 2
INT 21H
JMP EXIT;
_IN_ERR:
MOV DX, OFFSET MSG2;can not count so much !
MOV AH, 9
INT 21H
EXIT:
MOV AH, 4CH
INT 21H
CODE ENDS
END START
并解释一此程序的设计思想和流程图

Answer 1

DATA SEGMENT ;数据段.
MSG1 DB 13, 10, 'Please Input N (0~9, A~F): $'
MSG2 DB 13, 10, 'I can not count so much ! $'
MSG3 DB 13, 10, 'SUM = $'
DATA ENDS
;----------------------------------------------
CODE SEGMENT ;代码段
. ASSUME CS: CODE, DS: DATA
START:
MOV AX, DATA
MOV DS, AX
_IN_X:
MOV DX, OFFSET MSG1 ;Please Input
MOV AH, 9
INT 21H
MOV AH, 1 ;输入字符.
INT 21H
CMP AL, '0'
JB _IN_ERR ;小于'0'，输入错误.
CMP AL, '9'
JA _IN_X_AF ;大于'9'
SUB AL, '0'
MOV BL, AL
JMP _IN_Y
_IN_X_AF: ;大于'9'
CMP AL, 'A'
JB _IN_ERR ;小于'A'，输入错误.
CMP AL, 'F'
JA _IN_ERR ;大于'F'，输入错误.
SUB AL, 37H
MOV BL, AL
_IN_Y:
MOV DX, OFFSET MSG1 ;Please Input
MOV AH, 9
INT 21H
MOV AH, 1 ;输入字符.
INT 21H
CMP AL, '0'
JB _IN_ERR ;小于'0'，输入错误.
CMP AL, '9'
JA _IN_Y_AF ;大于'9'
SUB AL, '0'
JMP _SUM
_IN_Y_AF: ;大于'9'
CMP AL, 'A'
JB _IN_ERR ;小于'A'，输入错误.
CMP AL, 'F'
JA _IN_ERR ;大于'F'，输入错误.
SUB AL, 37H
_SUM:
ADD AL, BL ;相加
PUSH AX
MOV DX, OFFSET MSG3 ;SUM =
MOV AH, 9
INT 21H
POP AX

DISP:
;以16进制形式显示
XOR AH, AH
CALL PRINT
JMP EXIT;
_IN_ERR:
MOV DX, OFFSET MSG2;can not count so much !
MOV AH, 9
INT 21H
EXIT:
MOV AH, 4CH
INT 21H
PRINT PROC NEAR
PUSH BX
PUSH DX
MOV BX, 10
XOR DX, DX
OR AX, AX
JZ @@0
DIV BX
CALL PRINT
ADD DL, '0'
PUSH AX
MOV AH, 2
INT 21H
POP AX
@@0:
POP DX
POP BX
RET
PRINT ENDP

CODE ENDS
END START

Answer 2

课本有例题