@echo off
rem 原理来源于牛顿迭代法，只能计算1-214748，保留两位小数
set /p a=请输入数：
set /a a*=10000,b=a
for /l %%a in (1,1,100) do set /a b=(b+a/b)/2
set /a c=b*b,a/=10000
echo %a%的平方根或近似值为：%b:~,-2%.%b:~-2%
echo %b:~,-2%.%b:~-2%*%b:~,-2%.%b:~-2%=%c:~,-4%.%c:~-4%
pause>nul
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@echo off
setlocal enabledelayedexpansion
::Made By Defanive
:start
cls
echo 由于CMD位数计算的限制，精确度最高0.0001
echo 越大的数字数字精确度越来越低
echo Made By Defanive
echo.
set/p type=输入一个整数：
if %type% gtr 999999999 goto start
if %type% lss 1 goto start
set/a xn=type
set/a times=1
if %type% geq 99 set/a times=2
if %type% geq 9999 set/a times=3
if %type% geq 999999 set/a times=4
if %type% geq 99999999 set/a times=5
for /l %%a in (1,1,4) do (
set/a yn=!xn!*100
set/a zn=!yn!/100
if not !yn! lss 0 (
if !xn!==!zn! (
set/a xn=!yn!
)
)
)
set/a sn=xn
set sqn=1
for /l %%a in (1,1,20) do (
set/a sqn=sn/sqn+sqn
set/a sqn=sqn/2
)
echo.
echo √%type% ≈ !sqn:~0,%times%!.!sqn:~%times%!
pause>nul
goto start
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