Csh arithmetic not producing the expected value


 
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# 1  
Old 01-03-2014
Csh arithmetic not producing the expected value

My original post did not show up properly. I am trying again.
I have a simple tsch script that does some basic arithmetic. The calculated value was not producing the result I was expecting. I wrote a sample script to illustrate the things that I tried.

Code:
#!/bin/tcsh
@ count = 43
@ total_count = 61
@ failing = 4
@ no_finish = 0
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish   = $total_count - $count - $failing 
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = $total_count - ( $count + $failing )
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = ( $total_count - $count - $failing )
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = ( $total_count - $count ) - $failing 
echo $no_finish

script output

Total Count:61 Finished:43 Failed:4 61-43-4
22
Total Count:61 Finished:43 Failed:4 61-43-4
14
Total Count:61 Finished:43 Failed:4 61-43-4
22
Total Count:61 Finished:43 Failed:4 61-43-4
14



Last edited by sgualandri; 01-03-2014 at 05:52 PM.. Reason: original text did not show up
# 2  
Old 01-03-2014
Send send me a PM with the code you just posted.

We are trying to debug some issue with some new software from DragonByte.
# 3  
Old 01-03-2014
I cannot send a PM. I am a new user and do not have enough posts to qualify to send personal messages.

Steve
# 4  
Old 01-03-2014
It seems to evaluate right to left, a - b - c is push c, negate, add b, negate, add a. Yes, it is ugly. Use parens. I installed tcsh just to try:
Code:
$ tcsh -c '@ a = 61
@ b = 43
@ c = 4
@ tot = $a - $b - $c
echo $tot'
14
$ tcsh -c '
@ count = 43
@ total_count = 61
@ failing = 4
@ no_finish = 0
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish   = $total_count - $count - $failing
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = $total_count - ( $count + $failing )
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = ( $total_count - $count - $failing )
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = ( $total_count - $count ) - $failing
echo $no_finish
'
Total Count:61  Finished:43  Failed:4  61-43-4
14
Total Count:61  Finished:43  Failed:4  61-43-4
14
Total Count:61  Finished:43  Failed:4  61-43-4
14
Total Count:61  Finished:43  Failed:4  61-43-4
14
$ tcsh --version
tcsh 6.17.06 (Astron) 2011-04-15 (x86_64-unknown-linux) options wide,nls,dl,al,kan,rh,nd,color,filec
$

Some called it a documented feature, but I think that is a stretch: http://www.linuxmisc.com/12-unix-she...bdc36b511c.htm

Last edited by DGPickett; 01-03-2014 at 07:07 PM..
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