China DOS Union

Probably as follows

set /p a=input
set /a b=algorithm
%b% is the absolute value of the input number

Without using character replacement or IF judgment

The simplest way is to use a string replacement statement. The demonstration code is as follows:
@echo off set input= set /p input=Please enter a real number: echo %input:-=% pause
——————————————————
It turns out that character replacement is not wanted, and the use of if statements is not allowed. It's really too BT. I don't know what special needs you have for such a requirement. Here's another one:
@echo off set input= set /p input=Please enter a real number: for /f "tokens=* delims=-" %%i in ("%input%") do echo %%i pause

[ Last edited by namejm on 2007-1-17 at 12:33 AM ]

Hehe, the moderator you cheated, I want to get the absolute value through calculation, I've thought about it all afternoon

Method 1: Principle of Two Negatives Make a Positive

@echo off set /p var=Please enter a negative number: set /a var=-%var% echo The absolute value is: %var%

There is an error when calculating numbers with decimals ~ : )
There is an error when calculating positive numbers : )



Method 2: (Negative number) - (Negative number) * 2 = (Absolute value)

@echo on set /p var=Please enter a negative number: set /a var=%var%-%var%*2 echo The absolute value is: %var%

Does not support floating-point operations.
Only supports finding the absolute value of a negative number (errors occur when entering a positive number)

I got one:

@echo off
set /p n="Input any negative number: "
set /a m=~n+1
echo The absolute of %n% is: %m%
pause >nul

It's too easy by using it.

No decimal fraction, but zero is permitted.

[ Last edited by scriptor on 2007-1-17 at 11:16 AM ]

A crude example

Each of the upper and lower limits of the value of a is reduced by half

set /a b=(a*2+1)%%2*a

Please delete it. It was written wrong.

[ Last edited by scriptor on 2007-1-17 at 11:14 AM ]

Please let the moderator delete it.

[ Last edited by scriptor on 2007-1-17 at 11:12 AM ]

Brother scriptor

Here are two suggestions for you

1. Use more Chinese
2. Do more testing

Originally posted by qzwqzw at 2007-1-17 10:59:
Brother Scriptor

Here are two suggestions for you

1. Use more Chinese
2. Do more testing

You mean the code on floor 8?
Sorry, I made a mistake, that one can only calculate odd numbers

Thank you
I was in a hurry and sent it over

Have you tested the ~n+1 code in #4 with positive integers?

In addition, keeping the layout concise is our common obligation

I have stated there:
@echo off
set /p n="Input any negative number: "
is to input a negative number.

Thanks. Remembered
I found that I made many mistakes these days.
Really embarrassed to post again

Originally posted by qzwqzw at 2007-1-17 10:37 AM:
A crude example

Shrink the upper and lower limits of a by half each

set /a b=(a*2+1)%%2*a

Thank you qzwqzw, it seems I overcomplicated the problem

qzwqzw's idea is good, PF.

Gently ask:

Teacher qzwqzw

Can we use the binary assignment symbol of SET for conversion??

[ Last edited by tghksj on 2007-1-17 at 10:50 PM ]