CompactScientificCalculator54

Compact Scientific Calculator 54 for Windows 98, Windows 2000, Windows Server 2003, Windows XP and Vista.
This is a product which can be found most useful by scientists, engineers, professors, and students. The calculator was designed with purpose to fit Netbooks and Notebooks with small display. Of course, the calculator can be used on laptop and desktop computers also.
This calculator follows classical approach when uncertainty of f(x) calculation is estimated by formula max|(derivative(f))|*|x*uncertainty(x)|, where maximum of function derivative is considered on interval [x-uncertainty(x), x uncertainty(x)]. Thus sin(2*pi)=0 -1E-54 and sin(2*1E20*pi)=0 -1E-34. As we see, the result’s accuracy degrades with growth of argument, but such approach allows to preserve all trigonometry facts like sin(even number*pi x)=sin(x).
In the default mixed mode the calculator treats numbers as integers wherever it is possible. For example, 49! have an integer result with 63 digits. By the way, 63 digits is the internal precision of calculations. This is 7 super-digits, where a super-digit has 9 decimal digits.