Write a C++ program that uses nested for-loops to display a shape of stars and hashes (see examples). The program should ask the user to enter an integer n representing the number of rows/columns in a square. The number n should be positive and not larger than 10. If the user input for n is invali, then display an appropriate message and exit the program. The program should display a square of size n filled with different characters. The first row should be filled with the character @. Then each even column should be filled with the character and odd columns filled with the character #