warnings, errors;source code is included

I am getting warnings and errors like "implicit declarations .. and  return 
type defualts to int"
from the following source code. This ia oneof the examples in "Eric 
Harlow"'s  book.
(by the way very good book). I am new to programming and i have tried 
everything i could.

#include <gtk/gtk.h>
int ptimer;
int nValue;
UpdateProgressTimer (gpointer data)
  nValue += 1;
  UpdatePrgress (nValue, 100);
  if (nValue == 100) {
     EndPorgress ();
     gtk_timeout_remove (ptimer);
gint ButtonClicked (GtkWidget *widget, gpointer data)
  nValue = 0;
  StartProgress ();
  ptimer  = gtk_timeout_add (100, UpdateProgressTimer, data);
gint CloseAppWindow ()
  gtk_main_quit ();
  return (FALSE);
main (int argc, char *argv[])
  GtkWidget *window;
  GtkWidget *button;
  gtk_init (&argc, &argv);
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Progess bar");
  gtk_signal_connect (GTK_OBJECT (window), "delete_event",
                                GTK_SIGNAL_FUNC (CloseAppWindow), NULL);
  button = gtk_button_new_with_label ("Progress bar");
  gtk_widget_show (button);
  gtk_signal_connect (GTK_OBJECT (button) , "clicked",
                                GTK_SIGNAL_FUNC (ButtonClicked), NULL);
  gtk_container_add (GTK_CONTAINER (window), button);
  gtk_widget_show (window);
  gtk_main ();
  exit (0);

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