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OI-codes/Luogu/P8289/data/preprocessor2.in

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#define PI 3.14159
#define E 2.71828
std::cout << PI * r * r << std::endl;
std::cout << log10(x) / log10(E) << std::endl;
std::cout << "E^(PI * i) + 1 = 0" << std::endl;