How do I display a remainder in a batch file?

Question

I am using Windows 7 and I have the following:

set /p param=Please type a number
set /a answer= %param%/2
echo Your answer is %answer%

So anything they type in as a number gets divided by 2. However if it is an odd number, it just rounds it down to the whole number. For example if I typed in 7 it will give me 6 because 7/2 is 3.5 right? But it just rounds it down to the whole number instead of leaving a decimal or in this case a 3.5. Is there a way I can make it display it? Thanks

possible duplicate of [Floating point division in a dos batch](http://stackoverflow.com/questions/1503888/floating-point-division-in-a-dos-batch) — ne1410s, Sep 24 '14 at 20:19

npocmaka · Accepted Answer · 2014-09-24T20:36:57.683

0

set /p param=Please type a number
set /a answer= %param%/2
set /a mod=%param%%%2
echo Your answer is %answer%.%mod%

EDIT:

set /p param=Please type a number
set /a answer= %param%/2
set /a mod=%param%%%2
if %mod% equ 1 set mod=5
echo Your answer is %answer%.%mod%

but this will only with division by 2.

For real float point operations you can use MSHTA through command line and jscript function eval:

@echo off
setlocal

set /p exp=expression to calculate: 


:: Define simple macros to support JavaScript within batch
set "beginJS=mshta "javascript:close(new ActiveXObject('Scripting.FileSystemObject').GetStandardStream(1).Write(eval("
set "endJS=)));""


:: FOR /F does not need pipe
for /f %%N in (
  '%beginJS% %exp% %endJS%'
) do set result=%%N

echo result=%result%

edited Sep 24 '14 at 20:36

answered Sep 24 '14 at 20:19

npocmaka

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@GregRogers if this approach is ok for you can accept the answer so both of us will get some points :) – npocmaka Sep 24 '14 at 20:25
I shall, but I have to wait because it will not let me in a short time. – GregRogers Sep 24 '14 at 20:26
1

This won't give you the exact answer. For example if you put in 7, your outcome will be 3.1 not 3.5 – Arun Sep 24 '14 at 20:29
@rrriiight.I will fix it. – npocmaka Sep 24 '14 at 20:34

score 0 · Answer 2 · answered Sep 24 '14 at 20:24

0

There is no way of making that work properly, since technically does doesn't support math with floats.

You might want to use powershell for this. It will be a lot easier.

answered Sep 24 '14 at 20:24

Arun

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It was just what I was looking for. I just needed something to acknowledge that it "was" a decimal not the actual decimal :) – GregRogers Sep 24 '14 at 20:27

How do I display a remainder in a batch file?

2 Answers2