Friend I am trying to find best code so I can convert cents into minimum format here is my function

Code:
 public static Change getChange(int cents, Change availableChange)
        {
            /*
            * This method should take two parameters
            1.cents as an Integer, and
            2.availableChange as a Change object (see below)
            * It should return the same amount, or the maximum amount
            possible,
            in dollars and coins given what change is available in the
            availableChange parameter.
            * It should use the minimum number of coins possible,
            given what is available in availableChange.
            For example: 164 cents = 1 dollar, 2 quarters, 1 dime and 4
            cents.
            * Return null if the parameter is negative.
            */
            int dollars; // 100 cents
            int quarters; //25 cents
            int dimes; // 10 cents
            int nickels; // 5 cents
            int centbalance; // 1 cent
            if (cents < 0)
                return null;
            if (cents >= 100)
                quarters = Math.DivRem(cents, 100, out dollars);
            //if (quarters >= 25)
            //    quarters = Math.DivRem(quarters, 25, out dollars);

            //availableChange = new Change(dollars, quarters, dimes, nickels, centbalance);
            return availableChange;
        }

   public class Change
        {
            private int _dollars; // 100 cents
            private int _quarters; //25 cents
            private int _dimes; // 10 cents
            private int _nickels; // 5 cents
            private int _cents; // 1 cent
            public Change(int dollars, int quarters, int dimes, int nickels,
            int cents)
            {
                _dollars = dollars;
                _quarters = quarters;
                _dimes = dimes;
                _nickels = nickels;
                _cents = cents;
            }
            public int getDollars()
            {
                return _dollars;
            }
            public int getQuarters()
            {

                return _quarters;
            }
            public int getDimes()
            {
                return _dimes;
            }
            public int getNickels()
            {
                return _nickels;
            }
            public int getCents()
            {
                return _cents;
            }
        }
Update me if you have idea about it or have shortest code!

Shakt