Challenge: Print the Square of a Positive Number

Write code inside a function that receives a positive number as input and prints its square. If a negative number is entered, then raise an exception, display a relevant error message, and make a graceful exit from the program:

• Input: It should be a positive number as valid input.
• Output: The square of the positive number will be printed. If the number is negative, an exception will be raised and printed on the screen.