Write a class averagecalculator. the purpose of a averagecalculator object is to count, sum and average a series of numbers. the averagecalculator class has the following specification:

instance variable of type int for the running sum of numbers that have been given to the averagecalculator
instance variable of type int for the count of numbers that have been given to the averagecalculator

no argument constructor
averagecalculator ()

a mutator method to add a number to the averagecalculator
void add(int newnum)

an accessor method to return the sum of all the numbers added to the averagecalculator
int getsum()

an accessor method to return the count, or number, of numbers added to the averagecalculator
int getcount()

an accessor method to return the average of all the numbers added to the averagecalculator
note that the instance variables are int, and the return type of this method is double--be careful with the division operation.
if no numbers have been added to the averagecalculator object, return 0.
double getaverage()