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View Compilation Error

0_0_30767195_9985.cpp: In function 'int main()':
0_0_30767195_9985.cpp:10:45: error: 'M_PI' was not declared in this scope
         printf("%d\n", 1+(int)(log10(sqrt(2*M_PI*n)) + n*log10(n/M_E)));//Stiring
                                             ^
0_0_30767195_9985.cpp:10:66: error: 'M_E' was not declared in this scope
         printf("%d\n", 1+(int)(log10(sqrt(2*M_PI*n)) + n*log10(n/M_E)));//Stiring
                                                                  ^


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