中国DOS联盟

The modification has been completed, and the error in subtraction has been resolved! Please test!
1111111111.1111111111-1111111111.1111111112=-0.0000000001

pengfei：Why does it seem that your code is much slower than mine?

Yours is slower. When testing the same operation, yours takes more than thirty milliseconds, and mine takes about fifty milliseconds.

Your code performs operations on decimals and integers together, taking a shortcut in judgment. My original intention when writing was to fully simulate manual calculation. Therefore, the code is the most primitive way of calculation.

The variables used in my code are more, and the operations are more complex, which is also one of the reasons affecting the speed. The algorithm is the soul of the program, and the efficiency of solving the same problem will be different. Due to time constraints, the optimization and update of the code will be carried out later...

Last edited by pengfei on 2006-10-13 at 01:18 ]

Actually, it's not practical to calculate the numerical range of N bits with the above script, because the storage space of environment variables is limited...

Code updated to correct the problem of comparison code errors when variables are too long! Please test!

Gaga~~~! I really can't bear to modify the code in the first paragraph of the first floor. Although the algorithm is the most primitive. But implementing such an algorithm with the three basic structures of batch processing to complete. I am a little complacent myself, hehe~ This is my hard work!!!

Still don't plan to modify it, either write a new code with a new algorithm.

Brothers, please help test the bugs in the code of the first paragraph of the first floor...

After reading the old post, I think the algorithm in this post is worth learning from by everyone, so I'm bumping it up......

So you guys have already handled this matter. I also wanted to write a calculator myself, but I want to combine all of yours to make a mixed-operation calc. Is there any batch script that supports square roots?

@echo off

set a=2

set/p p=请输入需要开平方的数字(0~89999999之间)

set/p w=请输入精确到小数点后几位(9以内)

:lp

set /a a=(p/a+a)/2,n=a*a,r=a,y=p-n

if %n% lss 0 goto lp

if %n% gtr %p% goto lp

if %n% equ %p% goto ok

if "%w%"=="" goto ok

set/a m=10,x=r*20,y*=100,b+=1

:lp1

set/a m-=1,s=(x+m)*m

if %s% gtr %y% goto lp1

if %w% neq 0 set/a y-=s,r=r*10+m,t=t*10+m,m=10,x=r*20,y*=100,w-=1&goto lp1

:ok

if not "%t%" == ""  set a=%a%.%t%

echo %p%开平方结果: %a%

pause>nul

Search more and you'll have it

@echo off

set a=2

set/p p=Please enter the number for square root (between 0~89999999)

set/p w=Please enter the number of decimal places to be precise (within 9)

:lp

set /a a=(p/a+a)/2,n=a*a,r=a,y=p-n

if %n% lss 0 goto lp

if %n% gtr %p% goto lp

if %n% equ %p% goto ok

if "%w%"=="" goto ok

set/a m=10,x=r*20,y*=100,b+=1

:lp1

set/a m-=1,s=(x+m)*m

if %s% gtr %y% goto lp1

if %w% neq 0 set/a y-=s,r=r*10+m,t=t*10+m,m=10,x=r*20,y*=100,w-=1&goto lp1

:ok

if not "%t%" == ""  set a=%a%.%t%

echo The square root result of %p%: %a%

pause>nul