class Tank {
// Does provide for a tank of some fluid

// Attributes
   private int capacity;
   private int level;
  
   public Tank (int c) {
      capacity = c;
      level = 0;
   }//end constructor Tank

   public int theLevel() {
   // Does return the level in this tank
      return level;
   }//end function theLevel

   public void add (int amount) {
   // Does add an amount to this tank
   // Check no overflow
      level += amount;
   }//end routine add fluid

   public void sub (int amount) {
   // Does subtract amount from tank
   // Check tank does contain enough
      level -= amount;
   }//end routine subtract amount

   public void fill () {
   // Does fill up this Tank to capacity
      this.level = capacity;
   }//end fill

   public void empty() {
   // Does empty out this tank
      level = 0;
   }//end routine empty

   public void pourFrom (Tank s, int amount) {
   //Does pour an amount from tank s to this tank
   // Check                                                                                                                                                                                                                                                    
      s.sub (amount);
      add (amount);
   }//end routine pour an amount from s into this

   public boolean isEmpty () {
   // Does tell if this tank is empty
      return (level == 0);
   }//end routine isEmpty 

   public static void main (String [] args) {
   // Does test the Tank class
      Tank small, large;

      small = new Tank (4);
      large = new Tank (7);

   // Fill the smaller one
      small.fill();
      System.out.println ("Small now has " + small.theLevel() ); 
      System.out.println ("Large now has " + large.theLevel() ); 

   // Pour it into the larger one
      large.pourFrom (small, 4);
      System.out.println ("Small now has " + small.theLevel() ); 
      System.out.println ("Large now has " + large.theLevel() ); 

   // Fill smaller one again, and pour into larger till filled
      small.fill();
      while ( large.theLevel() < large.capacity ) //not pure!!
         large.pourFrom (small, 1);
      System.out.println ("Small now has " + small.theLevel() ); 
      System.out.println ("Large now has " + large.theLevel() ); 

   // Empty larger one and pour the smaller into it
      large.empty();
      while ( small.theLevel() > 0)
         large.pourFrom(small,1);
      System.out.println ("Small now has " + small.theLevel() ); 
      System.out.println ("Large now has " + large.theLevel() ); 

   // Fill the smaller one and pour it into the larger
      small.fill();
      while ( small.theLevel() > 0)
         large.pourFrom(small,1);
      System.out.println ("Small now has " + small.theLevel() ); 
      System.out.println ("Large now has " + large.theLevel() ); 
   
   // The larger one finally has 5 unit in it.

   }//end routine main 

}//end class Tank



class CountSort {
// Does provide a sort (ranking by counting)


   public static void countSort (int[] theArray) {
   // Does sort by counting number of values greater than each
      int value;
      int num = theArray.length;
      for (int i = 0; i < num; i++) {
         value = theArray[i];
         System.out.print (value + "  ");
         System.out.println (bigCount (theArray, value) );
      }//end for
   }//end routine countSort

   public static int bigCount (int[] arr, int val) {
   // Does count ...
      int count = 0;
      for (int i = 0; i < arr.length; i++)
         if (val > arr[i])
             count ++;
      return count;
   }//end function bigCount

   public static void main (String[] args) {
   // Does test 
      int intArray[] = { 0, 1,2,3,4,5,9,8};
      countSort (intArray);
   }//end routine main

}//end class CountSort

class Till {
// Does provide cash inventory of coins

// Attributes: coin denominations
   private int pennies;
   private int nickels;
   private int dimes;
   private int quarters;

   public Till (int p, int n, int d, int q) {
      pennies = p; 
      nickels = n;
      dimes   = d;
      quarters= q;
   }//end constructor Till

   public boolean areEqual (Till that) {
   // Does tell if this till equals that in detail
      if ( (this.pennies == that.pennies ) &&
           (this.nickels == that.nickels ) &&
           (this.dimes   == that.dimes   ) &&
           (this.quarters== that.quarters) )
      return true;
      else
      return false;
   }// end Function areEqual

   public int worth () {
      return pennies + 5*nickels + 10*dimes + 25*quarters;
   }//end Function worth

   public boolean areEquiv (Till that ) {
   // Does tell if worth of this till equals that one
      return (this.worth() == that.worth() );
   }// end function areEquivalent

   public static void main (String args[]) {
   // Does test Tell class
      Till mine, yours;
      mine  = new Till (4,2,1,3);
      yours = new Till (4,4,0,3);
      if (mine.areEqual (yours)) 
         System.out.println ("equal");
      else if (mine.areEquiv( yours))
         System.out.println ("equivalent");
      else
         System.out.println ("different");
   }//end routine main

}//end class Till