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Shell Programming and Scripting

Help with numeric manupulations

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# 1  
Old 04-20-2012
Help with numeric manupulations
I want to calculate the following expression in script:

Code:
val=179584.0
($val *3*16384)/(1073741824)

$val will have a floating value.

Thanks!

I tried with following:
Code:
 
 n=$(echo |awk '{ print $val*3*16384 }')
n=$(echo |awk '{ v=$val; print $v*3*16384 }')
expr $val \* 3.0 \* 16384.0

# 2  
Old 04-20-2012
Hi,

try:
Code:
echo "($val *3*16384)/(1073741824)"|bc  -l

# 3  
Old 04-20-2012
Quote:
Originally Posted by pokerino
Hi,

try:
Code:
echo "($val *3*16384)/(1073741824)"|bc  -l

worked.... anyway to make the final solution to a whole number?
We can use cut command but any other solution?
# 4  
Old 04-20-2012
use only
Code:
bc

without
Code:
-l

This User Gave Thanks to pokerino For This Post:
karumudi7
# 5  
Old 04-20-2012
Thanks for the help.

---------- Post updated at 09:05 PM ---------- Previous update was at 08:33 PM ----------

How can we limit the number of digits after the decimal.
If the above expression generates 8.220703125, how can we display it as 8.220
Last edited by karumudi7; 04-20-2012 at 01:05 PM..
# 6  
Old 04-20-2012
Code:
echo 'scale=3 ;(179584.0*3*16384)/(1073741824)' | bc

# 7  
Old 04-20-2012
If you want to do this all in awk:

Code:
awk -v val="$val" 'END { printf("%.3f", (val*3*16384)/1073741824); }' /dev/null
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