Real constants and functions: Difference between revisions

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             << "\npi = " << pi
             << "\nsqrt(2) = " << std::sqrt(2.0)
-            << "\nln(e) = " << std::log(e)
+            << "\nln(e) = " << std::log(euler_e)
             << "\nlg(100) = " << std::log10(100.0)
             << "\nexp(3) = " << std::exp(3.0)