Practice: Countdown#

Download starter code

This problem is very similar to the last practice problem, but now we want you to write a function called countdown that takes a starting number of seconds and starts the countdown from there instead (still counting by 10s). The format of the output will be slightly different to accommodate this starting point.

If the sequence does not evenly end with a 0 (e.g. if the countdown starts from 15 ), then 0 will not be printed. This shown in the example calls below.

The countdown function should take one int parameter for the starting point. You may assume the parameter is an int. If the parameter value is less than 0 , it should instead print Start must be non-negative! .

Here are four example calls to the function and their output is shown after ( print statements included to space out output).

countdown(60)
print()
countdown(15)
print()
countdown(-4)
print()
countdown(0)

60 second countdown
60
50
40
30
20
10
0
Done!

15 second countdown
15
5
Done!

Start must be non-negative!

0 second countdown
0
Done!

Hint: The lines of numbers should all be produced by your for loop while the first and last lines will appear outside the loop (since they only happen once).

Requirements#

  • Your solution should use a for loop and should not use a while loop.

  • Your program should use the main-method pattern (we provided the starter code) and should define a function named countdown (as described above) before the main method.