Crate a basic window
#include<window.h>
RESULT CALLBACK WndProc(HWND,UINT,WPARAM,PARAM);
//This is Prototype declaration or forward declaration
//It is the first line of function definition with Semicolon.
//Tells vc++ to look for the function definition anywhere in the program
//without prototype i calling a function before definition will result in "function not defined" compiler errror.
//wndProc function is defined after definition of winMain.
Const char g_SzClassName[]="my window class";
//This is our window class name that will be registered and used in createWindowEx function.
//It is an array of char i.e.a string
 int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR SzCmdLine,intiCmd Show)
{
WNDCLASSEx wc;
//WNDCLASSEx Structure Contain window class information.
HWND hwnd
//variable that will store handle to window
