Calc Bradis

Calc Bradis - calculator with functions of Bradis's tables and history of operations.
Functions:
1/x - one divide on entered value
x^2 - entered value multiple twice
x^3 - entered value multiple thrice
L(d) - Length of circle = pi * entered value
S(d) - Area of circle = (pi * entered value * entered value)/4
rnd4 - format number to number with four symbols after point

User can use history of operations.