CRLF MACRO MOV DL,0DH MOV AH,2 INT 21H MOV DL,0AH MOV AH,2 INT 21H ENDM STACK SEGMENT STACK DW 100 DUP(?) STACK ENDS DATA SEGMENT STRING DB 'INPUT THE NUMBER ACCORDING TO HEXNUM!',0DH,0AH,'$' LEN DW 1 CY DW ? BUF DW 256 DUP(0) DATA ENDS CODE SEGMENT STACK SEGMENT STACK 'STACK' DW 32 DUP(?) STACK ENDS ASSUME CS:CODE,DS:DATA,SS:STACK START: MOV AX,DATA MOV DS,AX MOV AX,STACK MOV SS,AX MOV DX,OFFSET STRING MOV AH,9 INT 21H MOV AH,1 INT 21H SUB AH,AH SUB AL,30H MOV CX,AX CRLF MOV AX,1 MOV BX,1 LP: MUL BX INC BX LOOP LP LEA DI,BUF MOV BX,10 MOV CX,16 LOOP1: DIV BX MOV [DI],DL INC DI SUB DX,DX LOOP LOOP1 DEC DI MOV CX,16 DISPLAY: ADD BYTE PTR[DI],30H MOV DL,[DI] MOV AH,2 INT 21H DEC DI LOOP DISPLAY MOV AX,4C00H INT 21H CODE ENDS END START把这段代码添加注释

; 定义CRLF宏，用于输出回车换行
CRLF MACRO
MOV DL,0DH
MOV AH,2
INT 21H
MOV DL,0AH
MOV AH,2
INT 21H
ENDM

STACK SEGMENT STACK
DW 100 DUP(?)
STACK ENDS

DATA SEGMENT
; 定义字符串常量
STRING DB 'INPUT THE NUMBER ACCORDING TO HEXNUM!',0DH,0AH,'$'
; 定义变量
LEN DW 1
CY DW ?
BUF DW 256 DUP(0)
DATA ENDS

CODE SEGMENT
STACK SEGMENT STACK 'STACK'
DW 32 DUP(?)
STACK ENDS

ASSUME CS:CODE,DS:DATA,SS:STACK

START:
; 初始化数据段寄存器
MOV AX,DATA
MOV DS,AX
; 初始化堆栈段寄存器
MOV AX,STACK
MOV SS,AX
; 输出提示信息
MOV DX,OFFSET STRING
MOV AH,9
INT 21H
; 读取输入的数据
MOV AH,1
INT 21H
SUB AH,AH
SUB AL,30H
MOV CX,AX
; 输出回车换行
CRLF
; 计算CX的阶乘
MOV AX,1
MOV BX,1
LP:
MUL BX
INC BX
LOOP LP
; 把结果保存到BUF中
LEA DI,BUF
MOV BX,10
MOV CX,16
LOOP1:
DIV BX
MOV [DI],DL
INC DI
SUB DX,DX
LOOP LOOP1
DEC DI
; 输出结果
MOV CX,16
DISPLAY:
ADD BYTE PTR[DI],30H
MOV DL,[DI]
MOV AH,2
INT 21H
DEC DI
LOOP DISPLAY
; 退出程序
MOV AX,4C00H
INT 21H

CODE ENDS

END START