Furthermore, you can assign and use variables, e.g. after x=1/7, you can calculate x*7 (which yields 1).


Operations:
    x+y, x-y, x*y, x/y, -x, +x: as usual
    x mod y: modulo; x**y: to the power
    round x, n round x: round (to n digits)
    */x, /*x: numerator, denominator of fraction
    floor x: largest integer <= x


Results shown are exact, unless they can't be represented exactly in decimal (like 1/7).  Such inexact results are preceded by a ~ and given in about 20 digits of precision.  

Type any arithmetic expression, e.g.
    (2**100 / 3.3)
and press the Enter key to see the result; or select an expression with the mouse and press Enter to evaluate it.