calculating the area of a circle with bc

[Tony Arnold]

Jozsef,

Since the area of a pizza is directly proportional to its diameter, you
only really need to calculate the price/diameter to find out the best
value for money!

Regards,
Tony.

Jozsef Vadkan wrote:
> input like:
> 
> sh count.sh 0.45 2200
> ...
> 
> explanations:
> 0.45 => diameter [in meter]
> 
> 2200 => e.g. xy money
> 
> $(echo "scale=100; 2^($1/2) * $(echo "scale=100; 4*a(1)" | bc -l)" | bc
> -l) => area of the circle
> 
> xy money => some nations currency
> 
> 
> i'm dividing the area of the circle because i want to get the "xy
> money/square meter"
> 
> 
> #!/bin/bash
> 
> echo "$2/$(echo "scale=100; 2^($1/2) * $(echo "scale=100; 4*a(1)" | bc
> -l)" | bc -l)" | bc -l
> 
> 
> is there a shorter/better way?
> 
> 
> it would be a pizza price calculator. [:D]
> 
> 45 cm pizza = 2200 xy money
> 30 cm pizza = 1260 xy money
> 22 cm pizza = 960 xy money
> 
> i just want to count that, what will i have to choose to get the best
> price for "xy money/square meter" pizza.
> 
> don't laugh. [:D]
> 
> 

-- 
Tony Arnold,                        Tel: +44 (0) 161 275 6093
Head of IT Security,                Fax: +44 (0) 870 136 1004
University of Manchester,           Mob: +44 (0) 773 330 0039
Manchester M13 9PL.                 Email: tony.arnold at manchester.ac.uk