0_0_29660506_13228.cpp: In function 'int main()':
0_0_29660506_13228.cpp:16:31: error: 'M_E' was not declared in this scope
cout << (int)(a * log10(a / M_E) + 0.5*log10(2 * M_PI * a)) + 1<< endl;
^
0_0_29660506_13228.cpp:16:52: error: 'M_PI' was not declared in this scope
cout << (int)(a * log10(a / M_E) + 0.5*log10(2 * M_PI * a)) + 1<< endl;
^
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