;显示:                   *
;                       ***
;                      *****
;                     *******
;                    *********
;                   ***********
;                  *************
;                 ***************
;                *****************
;               *******************
data segment
h1 db 20 dup(?)
data ends
stack segment stack
h2 db 20 dup(?)
stack ends
code segment
assume cs:code,ds:data,ss:stack
start:mov ax,data
      mov ds,ax
      mov bl,14h  ;距图中心空格数
      mov bh,1    ;星数
      mov cx,0ah  ;行数
x1:   push bx
x3:   cmp bl,0
      jz x2
      call z1
      dec bl
      jmp x3
x2:   cmp bh,0
      jz x4
      call z2
      dec bh
      jmp x2
x4:   call z3
      pop bx
      dec bl
      add bh,2
      loop x1
      mov ah,4ch
      int 21h
z1    proc
      mov dl,20h
      mov ah,2
      int 21h
      ret
z1    endp
z2    proc 
      mov dl,2ah
      mov ah,2
      int 21h
      ret
z2    endp
z3    proc
      mov dl,0dh
      mov ah,2
      int 21h
      mov dl,0ah
      mov ah,2h
      int 21h
      ret
z3    endp
code  ends
      end start