1. Write a program that takes an integer command-line argument n and plots an n-by-n checkerboard with red and black squares. Color the lower-left square red. 2. Write code to draw hearts, spades,...

1. Write a program that takes an integer command-line argument n and plots an n-by-n checkerboard with red and black squares. Color the lower-left square red.

2. Write code to draw hearts, spades, clubs, and diamonds. To draw a heart, draw a filled diamond, then attach two filled semicircles to the upper left and upper right sides.