View Compilation Error

0_0_39787366_10275.cpp: In function 'int main()':
0_0_39787366_10275.cpp:12:23: error: 'M_PI' was not declared in this scope
   12 |         a=0.5*log10(2*M_PI*n)+n*log10(n/M_E);
      |                       ^~~~
0_0_39787366_10275.cpp:12:41: error: 'M_E' was not declared in this scope
   12 |         a=0.5*log10(2*M_PI*n)+n*log10(n/M_E);
      |                                         ^~~