求一个整数N的平方根的汇编源文件

;本程序求N的平方根
STACK SEGMENT STACK
      DW 20 DUP(?)
STACK ENDS

DATA SEGMENT
N    DB 20H
M    DB 01H
I    DB 01H
DATA ENDS

CODES SEGMENT
      ASSUME CS:CODES,DS:DATA,ES:NOTHING,SS:STACK
MAIN: MOV AX,DATA
      MOV DS,AX

AGAIN:MOV AL,M
      CMP AL,N
      JAE DONE
      MOV AL,I
      MOV BL,2
      MUL BL
      ADD M,AL
      INC I
      JMP AGAIN

DONE: MOV AL,M
      CMP AL,N
      JE EXIT
      SUB I,1
EXIT: MOV DL,I
      ADD DL,30H
      MOV AH,02H
      INT 21H
      MOV AX,4C00H
      INT 21H
CODES ENDS
      END MAIN

;算法原理
(X+1)²  =  X²   +  2 * X + 1
令M_i = I²,
则M_i+1 = M_i + 2*I +1
用此式迭代计算