text: #pragma once
  #include "Wave.h"
  class Wave_Global
  {
  	public : 
  		 int Wave_CompareByMoney(Wave* w1, Wave* w2); // compare 2 waves in terms of money earned 
  		 int Wave_CompareByEnemies(Wave* w1, Wave* w2); //compare 2 waves in terms of numbers of enemies 
  };
  
  