View Compilation Error

0_0_39787392_26260.cpp: In function 'int main()':
0_0_39787392_26260.cpp:10:32: error: 'M_PI' was not declared in this scope
   10 |         a = 0.5 * std::log(2 * M_PI * n) / std::log(10) + n * std::log(n / M_E) / std::log(10);
      |                                ^~~~
0_0_39787392_26260.cpp:10:76: error: 'M_E' was not declared in this scope
   10 |         a = 0.5 * std::log(2 * M_PI * n) / std::log(10) + n * std::log(n / M_E) / std::log(10);
      |                                                                            ^~~