Hi,bucky this is AB,I've gone through the videos as i'm the beginner for C,they are quite good and i'd like to ask a doubt as we proceed the coding initially at the main can't we wright "void main" instead of int main and i just wanna know the difference between the both terms can you please let me know so that i could be aware of what to use and i do even have a doubt regarding #define can you please tell me what exactly it is as I've gone through the video but i couldn't understand that.