float

[tomte]

How do I in a csh, read in a decimal value, ex .05678 from a file and using the expr command apply arithmatic values to a variable. Example: set number = `expr $integer1 \* $decimal2` where decimal2 is the decimal value from a file. I return a null value to to number if decimal2 is a float value, but it works if decimal2 is an integer.

 

[olded]

Tom:

I'm not a real csh expert, but like ksh88, I don't think csh supports float arithmetic. You can use the bc command:

#!/bin/csh

set y=`echo '5 * 0.25'|bc`
echo $y

The ksh93 version of Korn supports float arithetic.

Regards,


Ed

 

[marsd]

You can also use awk:
printf "%f\n", 20.187 * 34.23345

 

[iribach]

on solaris, /bin/printf will do the same as marsd said.
i prefer oldeds way, no limits
/bin/echo "scale=99;(2^32)/7" | /bin/bc
is a nice one

 

[tomte]

Thanks all for the response.