Problem of InitializeAWindowPlease()

I got the error of “InitializeAWindowPlease was not declared” as prt of program listed below. How should I fix it? Do I miss any header or library added? Tks

===============================================================

#include <windows.h>
#include <GL/glut.h>

int main() {

InitializeAWindowPlease();

glClearColor (0.0, 0.0, 0.0, 0.0);
glClear (GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 1.0, 1.0);

Where did you get this code from? If this was from a tutorial or copied from a website, then they probably expect you to implement this function.