Deitel's C: How to programme, Exrcs 5.23

Code to answer exercise 5.23 of Deitel's C:How to programme 9/e.
It changes the exact time entered by user as hours, minutes and seconds and reports back its distance (in seconds) from 00:00 o'clock (if user's input shows a time before noon) or from 12:00 (if user's input shows a time after noon)