View Compilation Error

0_0_19484847_14499.cpp: In function 'int main()':
0_0_19484847_14499.cpp:11:25: error: 'M_PI' was not declared in this scope
   double s=log10(sqrt(2*M_PI*x))+x*log10(x/M_E);
                         ^
0_0_19484847_14499.cpp:11:44: error: 'M_E' was not declared in this scope
   double s=log10(sqrt(2*M_PI*x))+x*log10(x/M_E);
                                            ^