$$int_0^1frac{x^4(1-x)^4}{1+x^2}dx=frac{22}{7}-pi$$ $$text{Classic schoolboy approximation to } pi text{ is seen.}$$ ©

We do these things not because they are easy, but because we thought they were going to be easy. @Maciej CegÅ‚owski Many new programmers write code and then only test the happy path: only the cases where there are no errors. But you should also be planning for and testing your sad paths, where things can and will go wrong. @learncpp ©

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