FDM solution to Laplacian using Successive Over-Relaxation (SOR) method.The objective of the program is to solve for the steady state voltage distribution in a region 0<x<30, 0<y<30, given that one of the sides of square is excited with a voltage of 45*(x/xmax)*((1-x)/xmax) Volts (xmax=30) and all other sides are maintained at 0 Volts.