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How to round up value upto 2 decimal places using sed?

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# 1  
Old 11-15-2013
How to round up value upto 2 decimal places using sed?
Please help me in rounding up value upto 2 decimal palces using sed command

Code:
#!/usr/bin/bash

a=15.42
b=13.33

c=`echo $a*$b |bc -l`
 
echo $c

above code is is giving output "205.5486" but i want the output as "205.55"

Thank you...
# 2  
Old 11-15-2013
One of the ways:
Code:
c=`echo "scale=2;$a*$b" |bc -l`

This User Gave Thanks to bartus11 For This Post:
rbatte1
# 3  
Old 11-15-2013
Thanks but it is giving output "205.54" instead of "205.55"
# 4  
Old 11-15-2013
Using CygWin bash:-
Code:
AMIGA:~> text=42.377821
AMIGA:~> printf "%0.2f\n" $text
42.38
AMIGA:~> text=42.843821
AMIGA:~> printf "%0.2f\n" $text
42.84
AMIGA:~> _

# 5  
Old 11-15-2013
is there any sed command what can i use?
# 6  
Old 11-15-2013
A quick and dirty way:

Code:
echo "scale=2;($a*$b)+.01"|bc

This User Gave Thanks to in2nix4life For This Post:
ranabhavish
# 7  
Old 11-15-2013
sed cannot do math. sed cannot round numbers.

This seemingly simple question is difficult to solve completely in bc itself because it simply does not calculate in that fashion. The rounding at least can be done by adding 0.005 and truncating down to two decimal places. I don't think adding 0.01 is correct.

Code:
a=15.42
b=13.33

c=`echo "($a*$b)+0.005" |bc -l`
OLDIFS="$IFS" ; IFS="."
        set -- $c
        c="${1}.${2:0:2}"
IFS="$OLDIFS"

echo $c

These 2 Users Gave Thanks to Corona688 For This Post:
ranabhavish rbatte1
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