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Shell Programming and Scripting

Issues when dividing

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# 1  
Old 01-23-2012
Issues when dividing
Hi,
I do have a very simple task to divide 2 variables and display the result.
I CANNOT use bc
when i try
Code:
var1=2
var2=4
var3=$(($var1 / $var2))
echo $var3

the output is always 0
What can I change to get a dotted decimal result such as 0.5 ?
Thanks!
Last edited by Franklin52; 01-24-2012 at 05:05 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 01-23-2012
How about using awk:

Code:
var1=2
var2=4
var3=$(awk "BEGIN { print $var1 / $var2 }" /dev/null)
echo $var3

This User Gave Thanks to Chubler_XL For This Post:
svetoslav_sj
# 3  
Old 01-23-2012
Thanks a lot. That works!
# 4  
Old 01-25-2012
Just curious. Why can't you use bc?
# 5  
Old 01-25-2012
Hi,
you can achieve that using bc as follows
Code:
$ echo " scale=3;2/4"|bc -l
.500

thanks,
venkat
Last edited by Franklin52; 01-25-2012 at 07:42 AM.. Reason: Please use code tags for code and data samples, thank you
# 6  
Old 01-25-2012
If you are using ksh93 (or another shell that supports typeset), declare variables to be floats and save the overhead of calling awk:

Code:
#!/usr/dt/bin/dtksh

# Declare variables as floats.
typeset -F var1=2
typeset -F var2=4

# Declare answer to hold a float with 1 decimal point.
typeset -F1 var3=$(( $var1 / $var2 ))

echo $var3

exit 0

Output:
Code:
$ float_test
.5
$

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