2. Write a C++ program that reads in the side of a square and prints the square out of asterisks. Your program should work for square of all sizes between 1 and 20, when the user enter other sizes the program should display an error message.
Sample Run 1:
Enter the square side: 5
*****
*****
*****
*****
*****
Sample Run 2:
Enter the square side:21
invalid input. the side of a square should be between 1 and 20.