程序代码：

data segment

 num db 3,?,?,?

 cnt db ?
data ends

code segment
main proc far

 assume cs:code,ds:data

start:

 mov ax,data

 mov ds,ax

 mov dx,offset num

 mov ah,0ah

 int 21h

 mov al,num+1

 cmp al,1

 jz flag1

 mov al,num+2

 sub al,30h

 mov bl,10

 mul bl

 mov bl,num+3

 sub bl,30h

 add al,bl

 jmp flag2
flag1:

 mov al,num+2

 sub al,30h
flag2:

 mov bl,al

 shr bl,1

 jb flag3

 inc al
flag3:

 mov cnt,al

 mov cl,al

 mov ch,0

 inc cl
loop1:

 dec cx

 push cx

 sub al,cl

 jz  flag4

 mov cl,al
loop2:

 mov dl,' '

 mov ah,2

 int 21h
loop loop2
flag4:

 pop cx

 push cx
loop3:

 mov dl,'*'

 mov ah,2

 int 21h
loop loop3

 mov al,cnt

 pop cx
loop loop1

 mov ax,4c00h

 int 21h
main endp
code ends
end start