Question 3 Declare a large array of doubles. The first five elements of the array are to be read from the keyboard, and the rest of the array elements are to be read from a file containing an unknown number of doubles. Then the program should print the average of all the array elements. (It is easy to go wrong here. You should check your final average with a calculator to be sure that it is correct. There are traps, and you may get a wrong answer without realizing it - so check.)