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    <p>I usually ask myself whether I can maintain and fix the code at 3 AM being sleep deprived six months after writing the code. It has served me well. Looking at your formula, I'm not sure I can.</p> <p>Ages ago I worked in the insurance industry. Some of my colleagues were tasked to convert the actuarial formulas into code, first FORTRAN and later C. Mathematical and programming skills varied from colleague to colleague. What I learned was the following reviewing their code:</p> <ul> <li>document the actual formula in code; without it, years later you'll have trouble remember the actual formula. External documentation goes missing, become dated or simply may not be accessible. </li> <li>break the formula into discrete components that can be documented, reused and tested.</li> <li>use constants to document equations; <strong>magic</strong> numbers have very little context and often require existing knowledge for other developers to understand.</li> <li>rely on the compiler to optimize code where possible. A good compiler will inline methods, reduce duplication and optimize the code for the particular architecture. In some cases it may duplicate portions of the formula for better performance. </li> </ul> <p>That said, there are times where hard coding just simplify things, especially if those values are well understood within a particular context. For example, dividing (or multiplying) something by 100 or 1000 because you're converting a value to dollars. Another one is to multiply something by 3600 when you'd like to convert hours to seconds. Their meaning is often implied from the greater context. The following doesn't say much about magic number 100:</p> <pre><code>public static double a(double b, double c) { return (b - c) * 100; } </code></pre> <p>but the following may give you a better hint:</p> <pre><code>public static double calculateAmountInCents(double amountDue, double amountPaid) { return (amountDue - amountPaid) * 100; } </code></pre>
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