Have the user input a filename to read in ints from. Print each to the screen, one per line and keep a running total. Print the total at the end. If the file does not exist say so and do not print the total. Test Case 1: File contents (ask user to enter filename, the file they enter contains this): 2 4 6 8 10 Sample output: Read 2 from file. Read 4 from file. Read 6 from file. Read 8 from file. Read 10 from file. Total is 30. Test Case 2: File contents (ask user to enter filename, the file they enter contains this): 1 3 5 7 Sample Output: Read 1 from file. Read 3 from file. Read 5 from file. Read 7 from file. Total is 16. Test Case 3: (nonexistent file – user enters nonexistent filename) Sample output: Failed to open file.
