Write a complete C++ program to read a series of integer numbers separated by whitespace from standard input. Assume that input redirection will be used to redirect standard input from a file, so there is no need to print any sort of prompt for the user.

Your program should do the following:

• Find the sum of the even numbers read as input.
• Find the sum of the odd numbers read as input.
• Print the difference between the sum of the even numbers and the sum of the odd numbers, followed by a newline.

For example, if the file used as input for this program contained the following series of numbers:

12 7 15 20 9 3 6 4

then the correct output from the program would be:

8