Differences between _tmain () and main () in Visual Studio 2003

People who have used C know that every C program will have a main (), but sometimes it is written by someone else to find that the main function is not an int main (), but an int _tmain (), and the header file is not <iostream.h> but <stdafx.h Will you be confused? Let's see if they have anything to do with it.  First, this _tmain () is to support Unicode used by the main an alias, since it is an alias, there should be a macro defined, where is defined? In that confusing <stdafx.h>, there are two lines of # include <stdio.h> #include <tchar.h> we can find in the header file <tchar.h> _ TMAIN macro Definition     #define _tmain      main So, after pre-compiling, _tmain becomes main, which makes sense.

Differences between _tmain () and main () in Visual Studio 2003