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给以上求n阶乘的代码标注详细的注释

注释如下：

; 定义 CRLF 宏，用于输出换行符
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(?) ; 定义大小为 100 的堆栈
STACK ENDS

DATA SEGMENT
    STRING DB  'INPUT THE NUMBER ACCORDING TO HEXNUM!',0DH,0AH,'$' ; 定义输出字符串
    LEN   	DW 1
    CY    	DW ?
    BUF    	DW 256 DUP(0) ; 定义大小为 256 的缓冲区
DATA ENDS

CODE SEGMENT
STACK 	SEGMENT STACK 'STACK'
    DW 32 DUP(?) ; 定义大小为 32 的堆栈
STACK	ENDS
ASSUME CS:CODE,DS:DATA,SS:STACK

START:
    MOV AX,DATA
    MOV DS,AX ; 初始化数据段寄存器
    MOV AX,STACK
    MOV SS,AX ; 初始化堆栈段寄存器
    MOV DX,OFFSET STRING
    MOV AH,9
    INT 21H ; 输出字符串
    MOV AH,1
    INT 21H ; 读取一个字符
    SUB AH,AH
    SUB AL,30H ; 将 ASCII 码转为数值
    MOV CX,AX
    CRLF ; 输出换行符
    MOV AX,1
    MOV BX,1
LP:
    MUL BX ; 计算阶乘
    INC BX
    LOOP LP ; 循环计算阶乘
    LEA DI,BUF
    MOV BX,10
    MOV CX,16
LOOP1:
    DIV BX ; 除以 10 取余数
    MOV [DI],DL ; 将余数存入缓冲区
    INC DI
    SUB DX,DX
LOOP LOOP1
    DEC DI
    MOV CX,16
DISPLAY:
    ADD BYTE PTR[DI],30H ; 将余数转为 ASCII 码
    MOV DL,[DI]
    MOV AH,2
    INT 21H ; 输出余数
    DEC DI
    LOOP DISPLAY ; 循环输出余数
    MOV AX,4C00H
    INT 21H ; 程序结束
CODE ENDS
END START