China DOS Union

Also published on bathome
http://bbs.bathome.cn/viewthread.php?tid=1791&page=1&extra=page%3D1
If there are decimals, keep 3 decimal places.

@echo off

:action

set /p input="(1-99):"

if "%input%"=="" goto :action

set /a a=0,n=0

:a

set /a a+=1,a1=0

    :a1

     set /a a1+=1,test=(n*10+a1)*(n*10+a1)

     if %test% equ %input% (echo %a1% &pause &goto :end)

    if %test% lss %input% (goto :a1)

set /a n=n*10+a1-1,input*=100

if %a% lss 4 goto :a

echo %n:~0,1%.%n:~1%

pause>nul

:end

echo,&set input=

goto :action

[ Last edited by 523066680 on 2008-9-21 at 07:29 AM ]

That's good, it has been collected into the top-sticked Classic Thread Classification Index in Batch Processing Room.

Take a seat...

This time it's much more efficient

Principle: Compare digit by digit. For example, input 2.
0*0=0
1*1=1
2*2=4 4>2 so the first digit is 1.
Then 1.1*1.1
1.2*1.2
1.3*1.3……
1.4*1.4
1.5*1.5 = 2.25 >2 so take 1.4
And so on. Everyone is puzzled: Batch processing has no decimals.
Then calculate with integers, and then add a decimal point to it.

Thanks for everyone's support! I love cn-dos!