C++ problem

Question

If The user enters a period of time in seconds , the program will print it as hours
and minutes and seconds.
(ex:3600 seconds will be 01:00:00)
(ex:1000 seconds will be 00:16:40)

Answer 1

https://code.sololearn.com/c1gIosxPr97u/?ref=app

Answer 2

use modulo (%)