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Addition of floating numbers

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# 1  
Old 11-13-2009
Addition of floating numbers
Hi,
i want to add two decimal values to

$ set a= 12.4
$ set b=3.6
$ w=`expr $a - $b`
expr: non-numeric argument

or is there any other method to do this mathematics operation.
i need to use this into my script.
# 2  
Old 11-13-2009
This is quite a nice page on the subject

Floating Point Math in Bash | Linux Journal

---------- Post updated at 04:05 PM ---------- Previous update was at 03:44 PM ----------

When I tried these functions under ksh I had to remove the -q option for bc
# 3  
Old 11-13-2009
Here is how to do it in ksh. No need to use expr or subshells.
Code:
$ a=12.4
$ b=3.6
$ w=$((a-b))
$ echo $w
8.8

# 4  
Old 11-13-2009
That is true of ksh 93, in 88 the answer is 9 Smilie
# 5  
Old 11-17-2009
Data Not working
hi this is not working...
Its giving me an error.

w=$((a-b))
syntax error: `w=$' unexpected

can u suggest any other method
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