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Message: <blockquote data-quote="sanzilla jackcat" data-source="post: 12104706" data-attributes="member: 131221">machan [code]#include <iostream>[/code]this means you are including the header file of the iostream library.so you can use std::cin and std::cout  objects. There are other libraries tooyou could include their header files when you using them.[code]#include <unistd.h>   // this is a unix header file //#include <stdio.h>   // this is the old "C" library. In C++ also you'll need this#include <glut.h> // when doing OpenGL programming you will need this.// and more[/code]what a header file does is it have a extern declarations to some functions or variables. It's just a declaration not a definition. The definition is at a binary file [ we call these libraries ,more specifically static libraries].And about the main thing , yes it should be keep on your mind.There is something called C++ standard. You could have these following twoforms of the main method.[code]int main(void);int main( int argc, char **argv);[/code]and C++ standard also tells that you can't overload or re-declare or use both at once. It's not like the first case , because it's specifiedin the C++ specification.If not clear , feel free to ask again. --thanks in advance--</blockquote>

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