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Old 05-18-2009, 01:59 AM   #1
raman.kumar
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Angry How to do arithmatic operation on floating number by using expr ???


As i know that expr can not be used by decimal number....can anyone tell me that can i use expr and do arithmatic operation on decimal number ????
 
Old 05-18-2009, 02:35 AM   #2
colucix
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You can use either bc or awk. Using bc you have to specify the scale that is the total number of decimal digits after the decimal point. For example:
Code:
$ echo "scale=4; 3.4 / 2.0" | bc
1.7000
$ echo "scale=9; 3.4 / 2.0" | bc
1.700000000
In awk you can perform floating point arithmetic and print the result accordingly using printf:
Code:
$ awk 'BEGIN{printf "%11.9f\n",3.4/2.0}'
1.700000000
 
Old 05-18-2009, 07:02 AM   #3
pixellany
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Quote:
Originally Posted by raman.kumar View Post
As i know that expr can not be used by decimal number....can anyone tell me that can i use expr and do arithmatic operation on decimal number ????
Semantics:
"decimal number" means base 10. You mean floating point (not "floating")---or maybe "non-integer".

As you stated, "expr" does not do floating point. In fact, BASH does not do floating point. You need something like the suggestions from colucix.

Last edited by pixellany; 05-18-2009 at 07:03 AM.
 
  


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