Project 5 Array
Write a program that initializes an array-of-double and calls follow functions:
1. a function that returns the index of the largest value stored in an array-of-double.
2. a function that returns the difference between the largest and smallest elements of an array-of-double.

3. a function that copy the x(0<=x<=sizeofarray) through y(sizeofarray) elements of a sizeofarray-element array into a (y-x)-element array. (All two arrays should be declared in the main program.) The function itself need not be altered; just choose the right actual arguments.