A handy fast reliable precise tool if you need to perform calculations with complex functions. Complex Number Calculator Precision 18 is programmed in C#. All calculations are done in proprietary data type. The calculator handles mathematical formulas of any length and complexity. Calculation history can be stored into text file or printed. There are ten variables or constants available for storing often used numbers. Prebuilt Common Costants list with fundamental constants. Unlimited User Constants list. Precision of calculations is 18 digits. Trigonometric hyperbolic inverse and combinatorial functions. Complex Calculator Precision 18 has backward compatibility with College Scientific Calculator series and Scientific Calculator Precision 54. Any formula which works in College Scientific Calculator will work in this calculator. For that some buttons are duplicated. Button Mod stands for modulus and works on the same way as abs button. Button mod stands for modulo. Button Log stands for principal value of complex Log and is duplicated by button ln. Button log(z) works as Log(z)ln(10) for complex z and as decimal logarithm for real z although in Complex Analysis log denotes multi-valued function log(z)Log(z)+2*pi*n*i.