Consider the C program fragment in Figure 7.6 that illustrates random access.

(a) Is this valid C++ code? Why or why not?

(b) Write a small C or C++ program that creates a modest representative random access file GIS. data that can be used as input by this code.

(c) Complete this program in such a way that it navigates the grid beginning from the upper left-hand (NORTHWEST) corner and displays each x-y coordinate pair that it encounters at each step.