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Regarding decimal numbers

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# 1  
Old 01-30-2010
Regarding decimal numbers
Hello...

I am new to unix and I am wondering if in a C-shell script , Are we supposed to use only whole numbers........ for example..if a program needs to calculate the average of some numbers........

@ avg = (($1 +$2 + $3)/3)) is returning a whole number.........How can a decimal be achieved in a CShell........

ThanQ for your time.........
# 2  
Old 01-30-2010
A method of doing non-integer maths in scripts is to call the external binary bc(1), e.g.:
Code:
$ echo "scale=3; 10 / 3.141" | bc
3.183
$

The shell you use will then only determine how you assign the output to a variable.
# 3  
Old 01-30-2010
Code:
#!bin/csh
$ echo "scale=3; 10 / 3.141" | bc



I got an output
Code:
$: Command not found.



---------- Post updated at 06:39 PM ---------- Previous update was at 06:34 PM ----------

I have tried giviing
Prog:
Code:
#!bin/csh
var=`echo "scale=12;  .2  / 40.234"|bc`
echo $var

O/P
Code:
% csh average.csh
var=.004970920117: Command not found.
var: Undefined variable.

Prog:
Code:
#!bin/csh
#$ echo "scale=3; 10 / 3.141" |

O/P
Code:
csh average.csh
$: Command not found.

Looks like its because of C-Shell.......(I am not sure)
Last edited by pludi; 01-30-2010 at 07:44 PM.. Reason: code tags, please...
# 4  
Old 01-30-2010
Hi.
Code:
#!/bin/csh

and
Code:
set variable = value

note that later versions of ksh have floating-point builtin. If you can, avoid csh & tcsh for scripting, and use the Bourne shell family, sh, bash, ksh, zsh ... cheers, drl
# 5  
Old 01-30-2010
Hey thanq for the reply but if we use 'SET' , in the output a whole number is returned.

I need a floating number till one number after decimal point...
# 6  
Old 01-30-2010
Quote:
Originally Posted by ravindra22
I got an output
Code:
$: Command not found.

That probably means you don't have bc installed.

It's a math tool you may like if you do much math stuff. Depending on which OS you are using, you may be able to install it with one of these (as root or with sudo):
Code:
apt-get install bc
yum install bc

# 7  
Old 01-31-2010
To me it looks like the dollar sign in TonyFullerMalv's code was mistakenly taken as part of the script.


Code:
$ echo "scale=3; 10 / 3.141" | bc
3.183
$

i.e.
Code:
% $ echo "scale=3; 10 / 3.141" | bc
$: Command not found.

Remove the dollar from the script.
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