Hi everybody !!!!! Im new to programming and im very motivate to learn more. Right now I choose to begin my journey by learning the C language, and i'm getting there. My question sounds silly but goes like that what is a type of patcher like that (see below)..or where I put it how I write it...it seems a little complex and fairly different from the c language that i'm I learning..Can someone explain me what a block of code like that do and where I can use it.....

Thanx a lot Ben