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I am unable to divide using the divide operator provided in the SET command.

SET /A 216/18

SET /A div=216/18

ECHO %div%

Though this should work and it does in the command prompt window but when used through a batch script it gives a blank output.

like

ECHO is on.

Whats wrong?

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7
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    What means blank? For me, the script works.
    – Christian
    Commented Oct 9, 2013 at 0:05
  • Blank as in no output or if I direct the output to a text file then it creates an empty text file. Also I agree that it should work as this is the basic syntax but it doesn't and it only works in cmd window. I am using "Windows 7 Professional".
    – Gen1n
    Commented Oct 9, 2013 at 0:17
  • Have you added a "Pause"? I have written the code in notepad++ and it works as bat-script.
    – Christian
    Commented Oct 9, 2013 at 0:20
  • Works for me in a command prompt window.
    – martineau
    Commented Oct 9, 2013 at 0:54
  • File testbat.bat CD C:\DeleteLater SET /A Div=216/3 ECHO /3 %Div% >> testbat.txt File testbat.txt /3 72
    – BillR
    Commented Oct 9, 2013 at 1:29

2 Answers 2

Reset to default
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This can happen if your extenstions are disabled. You can check setlocal /? and cmd /? for more information about extensions.

But the set /? specifies:

If Command Extensions are enabled SET changes as follows:  
...
Two new switches have been added to the SET command:  
  SET /A expression  
  SET /P variable=[promptString]

So without extensions the /A does not work.

You can add the setlocal-line to the top of your batchfile:

setlocal enableextensions enabledelayedexpansion
SET /A 216/18
SET /A div=216/18
ECHO %div%
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Sorry, but I added the lines and the dos bat file still can't do division.

But, I admit that reading the help on the topic made no sense.

Here is the bat code, and what is wrong?:

:DOS can't do division setlocal enableextensions enabledelayedexpansion

SET hours2record=13 SET minutes2record=05 SET tracklength=46800

set /a seconds = %hours2record% * 3600 + %minutes2record% * 60 echo so far so good. Seconds are %seconds% pause

::SET /A trackdiv=%seconds%/46800 does not work ::SET /A trackdiv=468000/46800 works ::SET /A trackdiv=seconds/46800 does not work either SET /A %seconds%/%tracklength% SET /A trackdiv=%seconds%/%tracklength% & does not work

echo trackdiv variable is calculated as %trackdiv% . This is wrong! 47100/46800 does not equal 1! Stupid dos! pause

setlocal /? pause cmd /?

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