Calc is an arbitrary precision C-like arithmetic system that is a
calculator, an algorithm-prototyper, and a mathematical research tool. Calc
comes with a rich set of built-in mathematical and programmatic functions.
Note: this copy of Calc is linked against the GNU Readline library and has
been converted to the ordinary GPL as per section 3 of the LGPL. See the
included calc-converted-to-gpl.txt document for details.