It is quite an advanced calculator with various approximation modes (Always Exact, Interval Arithmetic, Try Exact, Approximate) and fractional modes (Decimal Rationals, Exact Rationals, Fraction, Combined).
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Qalculate is a free open source calculator software for Windows. You may also like some best free Open Source Billing Software, Open Source Budgeting Software, and Math Equation Editor Software for Windows. It lets you solve a wide number of problems in different approximation and fractional modes. Qalculate is my favorite open source calculator for Windows. My Favorite Open Source Calculator Software For Windows: Apart from these features, you can view calculation history, import expressions from CSV file, save results, etc. You can also record an expression as a macro to quickly use later. A few of these also provide a formula book containing some generic formulae to use directly in your calculations. Some of these also provide some constants to add in the input expression. In addition, you can also perform calculations related to graphs, physics, economics, probabilities, etc. These let you solve different kinds of mathematical problems including Algebra, Calculus, Combinatorics, Complex Numbers, Data Sets, Date & Time, Exponents & Logarithms, Geometry, Logical, Matrices & Vectors, Number Theory, Statistics, Step Functions, Trigonometry, etc.
You can perform simple as well as complex calculations using these software. The source code can be downloaded, studied, and manipulated by the interested users.
You can find the source code of these calculators from their official websites. What distinguishes these calculators from the calculators listed here is the fact that these are free and open source calculators. Here is a list of best free open source calculator software for Windows.
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