用减奇数次数的方法，求一个数的近似平方根

DATAS SEGMENT
NUM dw 17
ANS dw 0
b dw 0
DATAS ENDS

STACKS SEGMENT
;此处输入堆栈段代码
STACKS ENDS

CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
MOV AX,DATAS
MOV DS,AX

mov si,-1
xor bx,bx
mov bx,NUM

L1: add si,2
sub bx,si
cmp bx,0
jl  exit
inc b
jmp L1

exit:    mov ah,02h
mov dx,b
mov ANS,dx
add dx,30h
int 21h

MOV AH,4CH
INT 21H
CODES ENDS
END START