My question is where are the actual functions from header files? For example if i open conio.h there are only the functions prototypes, some defines and stuff like that .But where are the actual functions , i want to see them, to see how they are made , and make my own.Are they in those .lib extension files ?
Unless you have the source code for the libraries, you only have binaries to which your code links. These can be in .dll files or .lib on Windows; .a or .so on UNIX/Linux.