View Compilation Error

184640_0_32211.cpp:3:16: math: No such file or directory
184640_0_32211.cpp: In function `int main()':
184640_0_32211.cpp:14: error: `atan' undeclared (first use this function)
184640_0_32211.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)