1 2 #include <math.h> 3 4 #ifdef _MSC_VER 5 #pragma function(atanf) 6 #endif 7 8 _Check_return_ 9 float 10 __cdecl 11 atanf( 12 _In_ float x) 13 { 14 return (float)atan((double)x); 15 } 16