sr53.asm

这是汇编基本的程序主要是熟悉汇编的语法

STACK   SEGMENT  STACK
        DW       64 DUP(?)
STACK   ENDS
DATA    SEGMENT
N       DB       ?
RESULT  DW       ?
DATA    ENDS
CODE    SEGMENT
        ASSUME   CS:CODE, DS:DATA
START:	 MOV	   AX,DATA
	 MOV	   DS,AX
	 MOV       AX,OFFSET	RESULT
	 PUSH	   AX
	 MOV      AX,N
	 PUSH     AX
	 CALL	   MYSUB2
	 INT	   20H
MYSUB2   PROC
	 PUSH    BP
	 PUSH    AX
         MOV     BP,SP
         MOV     AX,SS:[BP+6]
	 CMP	  AX,0
	 JE       SUB1
	  dec ax 
        push ax 
        call MYSUB2
        pop ax 
        mul byte ptr ss:[bp+6]
	 JMP      SUB3
SUB1:    MOV	   AX,1
SUB3:    mov ss:[bp+6],ax 
        pop ax 
        pop bp 
        ret  

MYSUB2   ENDP
CODE     ENDS
         END        START