Shell Scripting - How to compare two floating point numbers ?

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How to compare two floating point numbers ?

how to perform the Arithmetic operations on floating point numbers ?

Total Answers and Comments: 5

Last Update: August 19, 2009 Asked by: Jitu

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March 26, 2007 07:54:10

#1

Amaresh Das

RE: How to compare two floating point numbers ?

a 3.10
b -3.10
((c $a+$b))
if [[ $c -eq 0.00 ]]; then
echo "$a is equal to $b"
else
echo "$a is not equal to $b"
fi;

--------------------------------------------
a 3.10
b -4.00
if [[ $a < $b ]]; then
echo "$a is less than $b"
else
echo "$a is greater than $b"
fi;

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March 28, 2007 07:38:56

#2

Rahul

RE: How to compare two floating point numbers ?

You can take this example

x 2.2
$ if [ $x 2.2 ]
> then
> echo "The numbers compared"
> else
> echo "Not compared"
> fi
The numbers compared

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April 13, 2007 07:32:58

#3

Jitu

RE: How to compare two floating point numbers ?

Hi Amaresh & Rahul

Could you please recheck your answers..
I think we can't perform addition directly with variables in Shell Scripting.

As Amresh you told.
c $a+$b rather we may require c `expr $a + $b`..
Please make me clear if i am wrong..

Hi Rahul as you have written if [ $a -eq 10.5 ]....this condition will always be true while executing...

Actually what i came to know that we can't perform Arithmetic Operation with Floating Point Numbers using "expr"...

Please help me to understand it clearly...

Thanking all of you..
:-)

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April 17, 2007 04:28:52

#4

Gaurav

RE: How to compare two floating point numbers ?

You can make you og 'bc' command to do the arithmatic operations in shell script.
Following script illustrates a sample implimentation

a 1.2
b 3.1
x $(echo $a+$b|bc)
echo [$x]

Where the arithmatic operation that is desired is marked in bold.

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August 18, 2009 10:38:00

#5

Member Since: August 2009 Contribution: 1

RE: How to compare two floating point numbers ?

We can use test also in command line

test 1.2 -gt 1.1 | echo abhishek

You will get o/p

abhishek.

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