Write a program RecursiveSum that has a static method sumInts() that returns the sum of all the value between 0 and n, where n is supplied to the method as a parameter.
In that static method, if n is greater than 0 the method should return the value of n added to the value of the sumInts of all the values less than n (but greater than 0). If n = 0 (the base case), return a value of 0.
Your program should also have a static main() method that demonstrates the recursive function sumInts().