History
It was first included with Windows 1.0 as a simple arithmetic calculator.
In Windows 3.0, a Scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, Statistic functions such as single variable statistics and linear regression. In Windows 3.0 and Windows 3.1 its interface had a white background with 2D buttons.
In Windows 95 and later, it uses an arbitrary-precision arithmetic library, replacing the standard IEEE floating point library. It offers bignum precision for basic operations (addition, subtraction, multiplication, division) and 32 digits of precision for advanced operations (square root, transcendental operators). Other changes include the use of 3d buttons. This version can run in Windows 3.1 if Win32s is installed.
In Windows 2000, digit grouping is added. Degree and base settings are added to menu bar.
Read more about this topic: Calculator (Windows)
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