[M-8]Write a main() program that prints
an n x n square composed of alternating star and dot characters.
*.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.* .*.*.*.*.*.*.*.*. *.*.*.*.*.*.*.*.*
Write the program so that it works regardless of whether n is even or odd.