Why sizeOf(double) == sizeOf(long double)?

Welcome to SoloLearn forum! How to make it Hollow? I have not a programming related but a sololearn related question Can we receive whatsapp messages using selenium in python? Which is the best part of SoloLearn ? Why there is no new challenging questions at sololearn specially Does this app run php codes Please suggest any online courses to learning of programming Can i use solo learn on my mac book. Why does it show blank white after button work