Write a main program which calls ``getallEs'' to get the energies of the states for carbon. Carbon has electrons in three states: ``1s'' (l=0 with zero nodes), ``2s'' (l=0 with one node), and ``2p'' (l=1 with zero nodes). For now, take the potential for carbon as V[k]=-Z/r[k], with Z=6. Finally, as usual, your main program should accept the number of intervals N as input from the keyboard so that we may explore convergence.