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Mathematical calculations in shellscript

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# 1  
Old 01-05-2012
Mathematical calculations in shellscript
Hi

want to do below mathematical calculations in shellscrip but it is not giving me the exact output.Please help me to solve this

Code:
price=95.3
price1=(20/100)*$price+$price
echo "price=$price1"


finally the output should display price=114.36

Thanks
# 2  
Old 01-05-2012
Shell itself doesn't do floating point arithmetics. Use bc or awk:
Code:
price=95.3 
price1=$(echo "(20/100)*$price+$price" | bc -l)

This User Gave Thanks to mirni For This Post:
aish11
# 3  
Old 01-05-2012
Code:
$ price1=`echo "scale=2; (20 / 100 * $price) + $price" | bc -l`
$ echo $price1
114.36

---------------------------------
Late post. Already replied by mirni.
Last edited by balajesuri; 01-05-2012 at 06:04 AM.. Reason: Late post
This User Gave Thanks to balajesuri For This Post:
aish11
# 4  
Old 01-05-2012
In awk ..
Code:
$ echo "" | nawk -v price=95.3 '{print (20/100)*price+price}'
114.36

This User Gave Thanks to jayan_jay For This Post:
aish11
# 5  
Old 01-05-2012
Thanks to all :-)
# 6  
Old 01-05-2012
Hi.

Suppose we have on file z1:
Code:
float price price1
price=95.3
price1="(20./100.)*$price+$price"
echo "price=$price1"

then zsh z1 produces:
Code:
% zsh z1
price=1.143600000e+02

and ksh z1 produces:
Code:
% ksh z1
price=114.36

For this context:
Code:
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
zsh 4.3.6
ksh 93s+

See man zsh and man ksh (long man pages). Best wishes ... cheers, drl
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