求n的阶乘，键盘输入n，结果存储在AX中。
1 DATA SEGMENT 2 3 DATA ENDS 4 STACK1 SEGMENT STACK 5 DB 50H DUP(0) 6 STACK1 ENDS 7 CODE SEGMENT 8 ASSUME CS:CODE,DS:DATA,SS:STACK1 9 START: MOV AX,DATA 10 MOV DS,AX 11 MOV AH,1 ;INPUT (AL) 12 INT 21H 13 XOR AH,AH 14 SUB AL,30H 15 MOV DX,1 16 CALL DIGUI 17 MOV AH,4CH ;RETURN DOS 18 INT 21H 19 DIGUI PROC NEAR 20 CMP AL,0 21 JE RET1 22 PUSH AX 23 DEC AL 24 CALL DIGUI 25 POP AX 26 MUL DL 27 MOV DX,AX 28 RET1: RET 29 DIGUI ENDP 30 CODE ENDS 31 END START