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View Compilation Error

0_0_21220578_23876.cpp: In function 'int main()':
0_0_21220578_23876.cpp:46:27: error: 'M_PI' was not declared in this scope
             if(abs( sum-2*M_PI ) <= 1e-5 ){
                           ^
0_0_21220578_23876.cpp:58:23: error: 'M_PI' was not declared in this scope
         if(abs( sum-2*M_PI ) <= 1e-5 )
                       ^


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