Your source code is intended to demonstrate for loops and branching via a switch statement.
Your program will display a Mandelbrot set, using plain text characters.
"Each position in a Mandelbrot image corresponds to an imaginary number of the form N = x + y*i, where the real part is x, the imaginary part is y, and i is the square root of -1. The x and y coordinates of the position in the image correspond to the x and y parts of the imaginary number."
Wiki a Madelbrot set: http://en.wikipedia.org/wiki/Mandelbrot_set