Modify the program from exercise 8 to use double instead of int. Also, make a vector of doubles containing the N–1 differences between adjacent values and write out that vector of differences.

Data from Exercise 8

Write a program that reads and stores a series of integers and then computes the sum of the first N integers. First ask for N, then read the values into a vector, then calculate the sum of the first N values. For example: “Please enter the number of values you want to sum:”
   3

“Please enter some integers (press '|' to stop):”

    12 23 13 24 15 |

“The sum of the fi rst 3 numbers ( 12 23 13 ) is 48.”

Handle all inputs. For example, make sure to give an error message if the user asks for a sum of more numbers than there are in the vector.