Convert degrees <-> radians [C++]

degrees-radians.h

#include<math.h>

const double DEG_TO_RAD = (M_PI / 180.0);
const double RAD_TO_DEG = (180.0 / M_PI);

inline double DegreesToRadians(double angleDegrees){
    return angleDegrees * DEG_TO_RAD;
}

inline double RadiansToDegrees(double angleRadians){
    return angleRadians * RAD_TO_DEG;
}