bc, for basic calculator

bc takes the following options from the command line:

-h, --help

Print the usage and exit.

-l, --mathlib

Define the standard math library.

-w, --warn

Give warnings for extensions to POSIX bc.

-s, --standard

Process exactly the POSIX bc language.

-q, --quiet

Do not print the normal GNU bc welcome.

-v, --version

Print the version number and copyright and quit.

Calculating pi to 10000 places

Calculate pi using the builtin arctangent function, a().

$ bc -lq
scale=10000
4*a(1) # The atan of 1 is 45 degrees, which is pi/4 in radians.
       # This may take several minutes to calculate.


The bc command supports the following features.